KHF 950 MANUAL

SYSTEM INSTALLATIONMANUAL

KHF 950 HF/SSB

COMMUNICATION SYSTEM

MANUAL NUMBER 006-05389-0002Revision 2 April, 2006

WARNING

PRIOR TO EXPORT OF THIS DOCUMENT, REVIEW FOR EXPORT LICENSE REQUIREMENT IS NEEDED.

COPYRIGHT NOTICE

©1994, 2002, 2006 HONEYWELL INTERNATIONAL INC.

REPRODUCTION OF THIS PUBLICATION OR ANY PORTION THEREOF BY ANY MEANS WITHOUT THE EXPRESS WRITTEN PERMISSION OF HONEYWELL IS PROHIBITED. FOR FURTHER INFORMATION CONTACT THE MANAGER, TECHNICAL PUBLICATIONS, HONEYWELL, ONE TECHNOLOGY CENTER, 23500 WEST 105TH STREET OLATHE KS 66061 TELEPHONE: (913) 782-0400.

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System Installation ManualP/N 006-05389-0002

KHF 950 HF/SSBCommunication System

KCU 951 Control UnitKFS 594 Miniature Control UnitKA 594 Bus AdapterKAC 952 Power Amplifier/ Antenna CouplerKTR 953 Receiver/ ExciterKA 98 Antenna KA 161 External CapacitorKA 158 Bridging AmplifierKA 160 Dual Antenna AdapterKA 162 Dual External Capacitor

T-1Revision 2 23-20-03 Apr/2006

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NOTE: iF ANY UNUSUAL OR SPECIAL SERVICE PROBLEMS ARISE, CONTACT HONEYWELL CUSTOMER SUPPORT DEPARTMENT.

PROPRIETARY NOTICE

This document contains proprietary information andsuch information may not be disclosed to others for anypurpose, nor used for manufacturing purposes withoutwritten permission from Honeywell.

T-2Revision 2 23-20-03 Apr/2006

NKHF 950 HF/SSB SYSTEM INSTALLATION MANUAL

REVISION HISTORY

KHF 950 HF/SSB

SYSTEM INSTALLATION MANUAL

23-20-03---------------------------------------------------------------------------------------------------------------------

PART NUMBER REV DATE DESCRIPTION

006-05389-0000 0 Feb/1994 Original Issue

006-05389-0001 1 Jul/2002 Replaces P/N 006-05389-0000 Rev. 0.

Added KCU 1051 Control Display Unit.

006-05389-0002 2 Apr/2006 Removed the -05 version of the KCU 951 Control Unit. See System Installation Manual P/N 006-10682-00XX.

Removed KCU 1051 Control Display Unit. See System Installation Manual P/N 006-10541-00XX.

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REVISION HISTORY

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LIST OF EFFECTIVE PAGES

SUBJECT PAGE DATE SUBJECT PAGE DATE

Title T-1 Apr/2006T-2 Apr/2006

Revision RH-1 Apr/2006History RH-2 Apr/2006

Record of RR-1 Apr/2006Revisions RR-2 Apr/2006

List of Effective Pages LEP-1 Apr/2006LEP-2 Apr/2006LEP-3 Apr/2006LEP-4 Apr/2006

Table of Contents TOC-1 Apr/2006TOC-2 Apr/2006TOC-3 Apr/2006TOC-4 Apr/2006TOC-5 Apr/2006TOC-6 Blank

List of Figures LOF-1 Apr/2006LOF-2 Apr/2006

List of Tables LOT-1 Apr/2006LOT-2 Apr/2006

Introduction INTRO-1 Apr/2006INTRO-2 Blank

Glossary G-1 Apr/2006G-2 Apr/2006

Description and 1 Apr/2006Operation 2 Apr/2006

3 Apr/20064 Apr/20065 Apr/20066 Apr/20067 Apr/20068 Apr/20069 Apr/200610 Apr/200611 Apr/2006

Description and 12 Apr/2006Operation (cont) 13 Apr/2006

14 Apr/200615 Apr/200616 Apr/200617 Apr/200618 Apr/200619 Apr/200620 Apr/200621 Apr/200622 Apr/200623 Apr/200624 Apr/200625 Apr/200626 Apr/200627 Apr/200628 Apr/200629 Apr/200630 Apr/200631 Apr/200632 Apr/200633 Apr/200634 Apr/200635 Apr/200636 Apr/200637 Apr/200638 Apr/200639 Apr/200640 Apr/200641 Apr/200642 Apr/200643 Apr/200644 Apr/200645 Apr/200646 Apr/200647 Apr/200648 Apr/200649 Apr/200650 Apr/200651 Apr/200652 Apr/200653 Apr/200654 Apr/200655 Apr/2006

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Description and 56 Apr/2006Operation (cont) 57 Apr/2006

58 Apr/200659 Apr/200660 Apr/200661 Apr/200662 Apr/200663 Apr/200664 Apr/200665 Apr/200666 Apr/200667 Apr/200668 Apr/200669 Apr/200670 Apr/200671 Apr/200672 Apr/200673 Apr/200674 Blank

Testing and 1001 Apr/2006Fault Isolation 1002 Apr/2006

1003 Apr/20061004 Apr/20061005 Apr/20061006 Apr/20061007 Apr/20061008 Apr/20061009 Apr/20061010 Apr/2006

Installation and 2001 Apr/2006Maintenance 2002 Apr/2006

2003 Apr/20062004 Apr/20062005 Apr/20062006 Apr/20062007 Apr/20062008 Apr/20062009 Apr/20062010 Apr/20062011 Apr/20062012 Apr/20062013 Apr/2006

Installation and 2014 Apr/2006Maintenance (cont) 2015 Apr/2006

2016 Apr/20062017 Apr/20062018 Apr/20062019 Apr/20062020 Apr/20062021 Apr/20062022 Apr/20062023 Apr/20062024 Apr/20062025 Apr/20062026 Apr/20062027 Apr/20062028 Apr/20062029 Apr/20062030 Apr/20062031 Apr/20062032 Apr/20062033 Apr/20062034 Apr/20062035 Apr/20062036 Apr/20062037 Apr/20062038 Apr/20062039 Apr/20062040 Apr/20062041 Apr/20062042 Apr/20062043 Apr/20062044 Apr/20062045 Apr/20062046 Apr/20062047 Apr/20062048 Apr/20062049 Apr/20062050 Apr/20062051 Apr/20062052 Apr/20062053 Apr/20062054 Apr/20062055 Apr/20062056 Apr/20062057 Apr/2006






Installation and 2058 Apr/2006Maintenance (cont) 2059 Apr/2006

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Installation and F 2101 Apr/2006Maintenance (cont) 2102 Blank

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TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INTRO-1

1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INTRO-12. Layout of Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INTRO-13. Revision Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INTRO-1

Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1

Description and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1. System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.A System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.B System Component Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101.B.(1) KCU 951 Control Unit (P/N 064-1016-XX). . . . . . . . . . . . . . . . . . . . . . . . . . 151.B.(2) KFS 594 Miniature Control Unit (P/N 071-1274-XX) . . . . . . . . . . . . . . . . . . 151.B.(3) KA 594 Bus Adapter (P/N 071-1268-XX). . . . . . . . . . . . . . . . . . . . . . . . . . . 151.B.(4) KAC 952 Power/Amplifier Coupler (P/N 064-1017-XX) . . . . . . . . . . . . . . . . 151.B.(5) KTR 953 Receiver/Exciter (P/N 064-1015-XX) . . . . . . . . . . . . . . . . . . . . . . 161.B.(6) KA 98 Antenna (P/N 071-1252-XX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161.B.(7) KA 161 External Capacitor (P/N 071-1271-XX). . . . . . . . . . . . . . . . . . . . . . 161.B.(8) KA 158 Bridging Amplifier (P/N 071-0019-XX) . . . . . . . . . . . . . . . . . . . . . . 171.B.(9) KA 160 Dual Antenna Adapter (P/N 071-1269-XX) . . . . . . . . . . . . . . . . . . . 171.B.(10) KA 162 Dual External Capacitor (P/N 071-1270-XX) . . . . . . . . . . . . . . . . . 171.C Component Installation Kits Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171.C.(1) KCU 951 Control Unit Installation Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171.C.(2) KFS 594 Miniature Control Unit Installation Kits . . . . . . . . . . . . . . . . . . . . . 181.C.(3) KA 594 Bus Adapter Installation Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191.C.(4) KAC 952 Power Amplifier/Antenna Coupler Installation Kits . . . . . . . . . . . . 201.C.(5) KTR 953 Receiver/Exciter Installation Kits . . . . . . . . . . . . . . . . . . . . . . . . . 261.C.(6) KA 98 Antenna Installation Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301.C.(7) KA 161 External Capacitor Installation Kits . . . . . . . . . . . . . . . . . . . . . . . . . 301.C.(8) KA 158 Bridging Amplifier Installation Kits. . . . . . . . . . . . . . . . . . . . . . . . . . 311.C.(9) KA 160 Dual Antenna Adapter Installation Kits . . . . . . . . . . . . . . . . . . . . . . 321.C.(10) KA 162 Dual External Capacitor Installation Kits. . . . . . . . . . . . . . . . . . . . . 331.D Equipment Required But Not Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341.E Optional (Non-essential) Aircraft Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . 371.F Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382. Component Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392.A KCU 951 Control Unit Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392.B KFS 594 Miniature Control Unit Configurations . . . . . . . . . . . . . . . . . . . . . . . . 392.C KA 594 Bus Adapter Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402.D KAC 952 Power Amplifier/Antenna Coupler Configurations . . . . . . . . . . . . . . . 402.E KTR 953 Receiver/Exciter Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

TOC-1Revision 2 23-20-03 Apr/2006


2.F KA 98 Antenna Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422.G Long Wire HF Antenna Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422.H KA 161 External Capacitor Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422.I KA 158 Bridging Amplifier Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422.J KA 160 Dual Antenna Adapter Configurations . . . . . . . . . . . . . . . . . . . . . . . . . 432.K KA 162 Dual External Capacitor Configurations . . . . . . . . . . . . . . . . . . . . . . . . 433. System Leading Particulars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443.A General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443.A.(1) SPEAKER OUT/DATA OUT 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443.A.(2) DATA OUT 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453.A.(3) DATA INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453.A.(4) Transmitter Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453.A.(5) Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453.A.(6) Transmit/Receive Switching Delay Times (-53 Data types). . . . . . . . . . . . . 463.B System Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463.B.(1) Emission Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463.B.(2) 23 MHz Limit Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473.B.(3) 27 MHz Limit Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473.B.(4) Rollover Mode Frequency and Channel Selection . . . . . . . . . . . . . . . . . . . 473.B.(5) Non-Rollover Mode Frequency and Channel Selection. . . . . . . . . . . . . . . . 473.B.(6) Channel Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473.B.(7) Direct Frequency Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483.B.(8) Data Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483.B.(9) SELCAL Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483.C Component Leading Particulars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493.C.(1) KCU 951 Control Unit, Leading Particulars . . . . . . . . . . . . . . . . . . . . . . . . . 493.C.(2) KFS 594 Miniature Control Unit, Leading Particulars . . . . . . . . . . . . . . . . . 503.C.(3) KA 594 Bus Adapter, Leading Particulars . . . . . . . . . . . . . . . . . . . . . . . . . . 513.C.(4) KAC 952 Power Amplifier/Antenna Coupler, Leading Particulars . . . . . . . . 523.C.(5) KTR 953 Receiver/Exciter, Leading Particulars. . . . . . . . . . . . . . . . . . . . . . 553.C.(6) KA 98 Antenna, Leading Particulars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593.C.(7) KA 161 External Capacitor, Leading Particulars . . . . . . . . . . . . . . . . . . . . . 603.C.(8) KA 158 Bridging Amplifier, Leading Particulars . . . . . . . . . . . . . . . . . . . . . . 613.C.(9) KA 160 Dual Antenna Adapter, Leading Particulars . . . . . . . . . . . . . . . . . . 623.C.(10) KA 162 Dual External Capacitor, Leading Particulars . . . . . . . . . . . . . . . . . 634. System Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 644.A System Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 644.A.(1) System Power UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 644.A.(2) Channel Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 654.A.(3) Direct Frequency Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 654.B Dual System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 665. Component Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 675.A KCU 951 Control Unit Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 675.A.(1) ON/OFF/VOLUME (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 675.A.(2) SQUELCH (B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67



5.A.(3) CLARIFIER (C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 685.A.(4) MODE (D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 685.A.(5) FREQ/CHAN (E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 685.A.(6) CHANNEL/FREQUENCY SELECT (F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 685.A.(7) CHANNEL CONTROL (G). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 685.A.(8) FREQUENCY CONTROL (H) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 685.A.(9) PROGRAM (PGM) SWITCH (I) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695.A.(10) STORE (STO) SWITCH (J) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695.B KFS 594 Miniature Control Unit Function . . . . . . . . . . . . . . . . . . . . . . . . . . 695.B.(1) ON/OFF/VOLUME CONTROL (A). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695.B.(2) SQUELCH (B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695.B.(3) MODE (C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 705.B.(4) CURSOR/INC/DEC (D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 705.B.(5) STO (E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 706. System Inputs/Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 716.A Input/Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 716.B Dual System Interlock Control Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Testing and Fault Isolation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1001

1. Fault Isolation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10012. System Performance Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10012.A Preliminary Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10022.B Receiver Performance Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10032.C Transmitter Performance Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10043. Fault Isolation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1007

Installation and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2001

1. General Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20012. Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20013. Pre-installation Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20014. Equipment Changes and Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20015. Installation Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20025.A General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20025.B Location of Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20025.B.(1) KCU 951 Control Unit Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . 20025.B.(2) KFS 594 Miniature Control Unit Mounting Location. . . . . . . . . . . . . . . . . 20025.B.(3) KA 594 Bus Adapter Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . 20035.B.(4) KAC 952 Power Amplifier/Antenna Coupler Mounting Location . . . . . . . 20035.B.(5) KTR 953 Receiver/Exciter Mounting Location . . . . . . . . . . . . . . . . . . . . . 20055.B.(6) Antenna Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20055.C Interwiring and Cable Fabrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20155.C.(1) Fabrication and Routing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20155.C.(2) Interface Capability and Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . 2015



5.C.(3) Primary Power and Circuit Breaker Requirements . . . . . . . . . . . . . . . . . 20165.C.(4) Antenna Cable Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20165.C.(5) Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20165.C.(6) Crimping, Insertion and Extraction Tools. . . . . . . . . . . . . . . . . . . . . . . . . 20435.D Strapping Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20455.D.(1) KCU 951 Control Unit Strapping Options . . . . . . . . . . . . . . . . . . . . . . . . 20455.D.(2) KFS 594 Miniature Control Unit Strapping Options . . . . . . . . . . . . . . . . . 20475.D.(3) KA 594 Bus Adapter Strapping Options . . . . . . . . . . . . . . . . . . . . . . . . . 20476. Equipment Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20476.A Bonding Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20476.A.(1) Special Bonding Connection and Corrosion Prevention Techniques . . . 20476.A.(2) Bonding Strap Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20486.B KCU 951 Control Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20486.C KFS 594 Miniature Control Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . 20486.D KA 594 Bus Adapter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20496.E KAC 952 Power Amplifier/Antenna Coupler Installation . . . . . . . . . . . . . . . . 20496.E.(1) Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20496.E.(2) Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20496.E.(3) Speech Processed System Considerations. . . . . . . . . . . . . . . . . . . . . . . 20496.E.(4) Grounding Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20496.F KTR 953 Receiver/Exciter Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20526.G Antenna Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20536.G.(1) Selecting an Antenna Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20536.G.(2) Antenna Bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20536.G.(3) Antenna configurations other than KA 98 Antenna.. . . . . . . . . . . . . . . . . 20536.G.(4) KA 98 Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20536.H KA 161 External Capacitor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20546.I KA 158 Bridging Amplifier Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20546.J KA 160 Dual Antenna Adapter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 20556.K KA 162 Dual External Capacitor Installation . . . . . . . . . . . . . . . . . . . . . . . . . 20567. Inspection, System Checkout, and Flight Test Procedures . . . . . . . . . . . . . . . . 20577.A. Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20577.B. System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20587.B.(1) General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20587.B.(2) System Interwiring Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20587.B.(3) Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20597.B.(4) Post-Installation Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20597.C. Flight Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20598. Removal and Re-installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20598.A KCU 951 Control Unit Removal and Re-installation . . . . . . . . . . . . . . . . . . . 20598.A.(1) KCU 951 Control Unit Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20598.A.(2) KCU 951 Control Unit Re-installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 20598.B KFS 594 Miniature Control Unit Removal and Re-installation . . . . . . . . . . . 20608.C KA 594 Bus Adapter Removal and Re-installation . . . . . . . . . . . . . . . . . . . . 20608.D KAC 952 Power Amplifier/Antenna Coupler Removal and Re-installation . . 2060



8.D.(1) KAC 952 Power Amplifier/Antenna Coupler Removal . . . . . . . . . . . . . . . 20608.D.(2) KAC 952 Power Amplifier/Antenna Coupler Re-installation . . . . . . . . . . 20608.E KTR 953 Receiver/Exciter Removal and Re-installation. . . . . . . . . . . . . . . . 20608.E.(1) KTR 953 Receiver/Exciter Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20608.F KA 98 Antenna Removal and Re-installation . . . . . . . . . . . . . . . . . . . . . . . . 20618.F.(1) KA 98 Antenna Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20618.F.(2) KA 98 Antenna Re-installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20618.G KA 161 External Capacitor Removal and Re-installation . . . . . . . . . . . . . . . 20628.G.(1) KA 161 External Capacitor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20628.G.(2) KA 161 External Capacitor Re-installation. . . . . . . . . . . . . . . . . . . . . . . . 20628.H KA 158 Bridging Amplifier Removal and Re-installation . . . . . . . . . . . . . . . . 20638.H.(1) KA 158 Bridging Amplifier Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20638.H.(2) KA 158 Bridging Amplifier Re-installation . . . . . . . . . . . . . . . . . . . . . . . . 20638.I KA 160 Dual Antenna Adapter Removal and Re-installation . . . . . . . . . . . . 20638.I.(1) KA 160 Dual Antenna Adapter Removal . . . . . . . . . . . . . . . . . . . . . . . . . 20638.I.(2) KA 160 Dual Antenna Adapter Re-installation. . . . . . . . . . . . . . . . . . . . . 20638.J KA 162 Dual External Capacitor Removal and Re-installation . . . . . . . . . . . 20648.J.(1) KA 162 Dual External Capacitor Removal. . . . . . . . . . . . . . . . . . . . . . . . 20648.J.(2) KA 162 Dual External Capacitor Re-installation . . . . . . . . . . . . . . . . . . . 20649. Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20659.A In-Aircraft Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20659.B System Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20659.C Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20659.D Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206510. System Maintenance Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206510.A System Maintenance Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . 206510.B Field Alignment of KTR 953 Receiver/Exciter (-51, -53) . . . . . . . . . . . . . . . . 206610.B.(1) Data Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206610.B.(2) Data Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2066



Blank Page



LIST OF FIGURES

Figure 1 - KCU 951 Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Figure 2 - KFS 594 Miniature Control Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Figure 3 - KA 594 Bus Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Figure 4 - KAC 952 Power Amplifier/Antenna Coupler . . . . . . . . . . . . . . . . . . . . . . . . . 3Figure 5 - KTR 953 Receiver/Exciter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Figure 6 - KA 98 Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Figure 7 - KA 161 External Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Figure 8 - KA 158 Bridging Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Figure 9 - KA 160 Dual Antenna Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Figure 10 - KA 162 Dual External Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Figure 11 - Typical Dual System Photo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 12 - Typical Single System Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Figure 13 - Typical Dual System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 14 - Typical KHF 950 Single System with Long Wire Antenna. . . . . . . . . . . . . 11Figure 15 - Typical KHF 950 Single System with Shunt Antenna or KA 98 Antenna . 12Figure 16 - Typical KHF 950 Dual System with Long Wire Antenna . . . . . . . . . . . . . . 12Figure 17 - Typical KHF 950 Dual System with Shunt Antenna or KA 98 Antenna . . . 13Figure 18 - KHF 950 Single System Component Relationships . . . . . . . . . . . . . . . . . 13Figure 19 - KHF 950 Dual System Component Relationships. . . . . . . . . . . . . . . . . . . 14Figure 20 - Long Wire HF Antenna Kit P/N 071-01214-0000 . . . . . . . . . . . . . . . . . . . 37Figure 21 - KCU 951 Control Unit Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67Figure 22 - KFS 594 Miniature Control Unit Controls . . . . . . . . . . . . . . . . . . . . . . . . . 69Figure 1001 - System Check Using SWR/Wattmeter . . . . . . . . . . . . . . . . . . . . . . . 1005Figure 2001 - KAC 952 Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . 2003Figure 2002 -Typical Wing Tip “V” Antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2007Figure 2003 - Typical Inverted “V” Antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2008Figure 2004 - Typical Long Wire Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2009Figure 2005 - Typical Short Wire to Vertical Stabilizer Antenna . . . . . . . . . . . . . . . 2010Figure 2006 - Typical Short Wire to Wing Antenna . . . . . . . . . . . . . . . . . . . . . . . . . 2011Figure 2007 - Typical Short Wire to Horizontal Stabilizer Antenna . . . . . . . . . . . . . 2011Figure 2008 - Typical Shunt Leading Edge Antenna . . . . . . . . . . . . . . . . . . . . . . . . 2012Figure 2009 - Typical Shorted Tranline or Towel Bar Antenna . . . . . . . . . . . . . . . . 2013Figure 2010 - Typical KA 98 HF Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2014Figure 2011 - KCU 951 Control Unit Connector (J9511) Pin Configuration. . . . . . . 2017Figure 2012 - KFS 594 Miniature Control Unit Connector (J5941) . . . . . . . . . . . . . 2021Figure 2013 - KA 594 Bus Adapter Connector (P5941) Pin Configuration . . . . . . . 2023Figure 2014 - KA 594 Bus Adapter Connector (P5942) Pin Configuration . . . . . . . 2027Figure 2015 - KAC 952 Connector (P9524) Pin Configuration . . . . . . . . . . . . . . . . 2028Figure 2016 - KAC 952 (-02,-12) Connector (P9526) Pin Configuration . . . . . . . . . 2030Figure 2017 - KTR 953 Receiver/Exciter Connector (P9531) Pin Configuration . . . 2032Figure 2018 - KA 98 Connector (P982) Pin Configuration. . . . . . . . . . . . . . . . . . . . 2036Figure 2019 - KA 161 External Capacitor Connector (P1612) Pin Configuration . . 2037

LOF-1Revision 2 23-20-03 Apr/2006


Figure 2020 - KA 158 Connector (P1585) Pin Configuration. . . . . . . . . . . . . . . . . . 2038Figure 2021 - KA 160 Connector (P1603) Pin Configuration. . . . . . . . . . . . . . . . . . 2039Figure 2022 - KA 162 Connector (P1623) Pin Configuration. . . . . . . . . . . . . . . . . . 2040Figure 2023 - BNC Connector (P/N 030-00005-0001) Assembly Procedure . . . . . 2041Figure 2024 - HN Connector (P/N 030-00192-0000) Assembly Procedure. . . . . . . 2042Figure 2025 - Crimping, Insertion, Extraction Tools. . . . . . . . . . . . . . . . . . . . . . . . . 2043Figure 2026 - KCU 951 Control Board Strapping Options . . . . . . . . . . . . . . . . . . . . 2046Figure 2027 - KAC 952 Grounding Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2051Figure 2028 - KCU 951 Control Unit Outline and Mounting Drawing. . . . . . . . . . . . 2069Figure 2029 - KFS 594 Outline and Mounting Drawing . . . . . . . . . . . . . . . . . . . . . . 2071Figure 2030 - KA 594 Outline and Mounting Drawing . . . . . . . . . . . . . . . . . . . . . . . 2073Figure 2031 - KAC 952 Outline and Mounting Drawing. . . . . . . . . . . . . . . . . . . . . . 2075Figure 2032 - KTR 953 Outline and Mounting Drawing . . . . . . . . . . . . . . . . . . . . . . 2077Figure 2033 - KA 98 Outline and Mounting Drawing . . . . . . . . . . . . . . . . . . . . . . . . 2079Figure 2034 - KA 161 External Capacitor (-00) Outline and Mounting Drawing . . . 2081Figure 2035 - KA 161 External Capacitor (-01) Outline and Mounting Drawing . . . 2083Figure 2036 - KA 161 External Capacitor (-02) Outline and Mounting Drawing . . . 2085Figure 2037 - Dual KAC 952 Outline and Mounting. . . . . . . . . . . . . . . . . . . . . . . . . 2087Figure 2038 - Dual KTR 953 Outline and Mounting Drawing. . . . . . . . . . . . . . . . . . 2089Figure 2039 - KA 160 Dual Antenna Adapter (-00) Outline and Mounting Drawing 2091Figure 2040 - KA 160 Dual Antenna Adapter (-01) Outline and Mounting Drawing 2093Figure 2041 - KA 160 Dual Antenna Adapter (-02) Outline and Mounting Drawing 2095Figure 2042 - KA 162 Dual External Capacitor (-01) . . . . . . . . . . . . . . . . . . . . . . . . 2097Figure 2043 - KA 162 Dual External Capacitor (-02) . . . . . . . . . . . . . . . . . . . . . . . . 2099Figure 2044 - KHF 950 (KCU 951) with KA 98 Antenna Interconnect Drawing. . . . 2101Figure 2045 - KHF 950 KCU 951) Interconnect Drawing. . . . . . . . . . . . . . . . . . . . . 2103Figure 2046 - KHF 950 12 Vdc to 28 Vdc Conversion. . . . . . . . . . . . . . . . . . . . . . . 2105Figure 2047 - KHF 950 12 Vdc to 28 Vdc Conversion. . . . . . . . . . . . . . . . . . . . . . . 2107Figure 2048 - Dual KHF 950 (KCU 951) with KA 160 Dual Antenna Adapter . . . . . 2109Figure 2049 - Dual KHF 950 (KCU 951) with KA 160 Dual Antenna Adapter . . . . . 2111Figure 2050 - KHF 950 (KCU 951) with KA 161 External Capacitor . . . . . . . . . . . . 2113Figure 2051 - Dual KHF 950 (KCU 951) with KA 162 Dual External Capacitor. . . . 2115Figure 2052 - Dual KHF 950 Auto Select Interlock Functional Block Diagram . . . . 2119Figure 2053 - Dual KHF 950 (KA 594/KFS 594) with KA 162 Dual External . . . . . . 2123Figure 2054 - KTR 953 (Data -5X) Interconnect Drawing . . . . . . . . . . . . . . . . . . . . 2125Figure 2055 - KHF 950 (KA 594/KFS 594) with KA 161 External Capacitor . . . . . . 2127Figure 2056 - KHF 950 (KA 594/KFS 594) with KA 98 Antenna . . . . . . . . . . . . . . . 2129Figure 2057 - Dual KHF 950 (KA 594/KFS 594) with KA 160 Dual Antenna. . . . . . 2131Figure 2058 - Dual KHF 950 (KA 594/KFS 594) with KA 160 Dual Antenna. . . . . . 2133

LOF-2Revision 2 23-20-03 Apr/2006


LIST OF TABLES

Table 1 - KCU 951 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Table 2 - KCU 951 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Table 3 - KFS 594 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Table 4 - KA594 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Table 9 - KAC 952 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Table 10 - KAC 952 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Table 11 - KAC 952 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Table 12 - KAC 952 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Table 13 - KAC 952 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Table 14 - KAC 952 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Table 15 - KTR 953 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Table 16 - KTR 953 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Table 17 - KTR 953 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Table 18 - KTR 953 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Table 19 - KTR 953 Installation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Table 20 - KA 98 Installation Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Table 21 - KA 161 Installation Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Table 22 - KA 161 Installation Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Table 23 - KA 161 Installation Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Table 24 - KA 158 Installation Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Table 25 - KA 160 Installation Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Table 26 - KA 160 Installation Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Table 27 - KA 160 Installation Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Table 28 - KA 162 Installation Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Table 29 - KA 162 Installation Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Table 30 - Aircraft Equipment Required But Not Supplied. . . . . . . . . . . . . . . . . . . . . . 36Table 31 - Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Table 32 - KCU 951 Control Unit, Configurations Available . . . . . . . . . . . . . . . . . . . . 39Table 33 - KFS 594 Miniature Control Unit, Configurations Available . . . . . . . . . . . . . 39Table 34 - KA 594 Bus Adapter, Configurations Available . . . . . . . . . . . . . . . . . . . . . 40Table 36 - KAC 952 Power Amplifier/Antenna Coupler, Configurations Available . . . 40Table 37 - KTR 953 Receiver/Exciter, Configurations Available . . . . . . . . . . . . . . . . . 41Table 38 - KA 98 Antenna, Configurations Available. . . . . . . . . . . . . . . . . . . . . . . . . . 42Table 39 - Long Wire HF Antenna, Configurations Available . . . . . . . . . . . . . . . . . . . 42Table 40 - KA 161 External Capacitor, Configurations Available. . . . . . . . . . . . . . . . . 42Table 41 - KA 158 Bridging Amplifier, Configurations Available . . . . . . . . . . . . . . . . . 42Table 42 - KA 160 Dual Antenna Adapter, Configurations Available. . . . . . . . . . . . . . 43Table 43 - KA 162 Dual External Capacitor, Configurations Available . . . . . . . . . . . . 43Table 44 - Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Table 45 - KCU 951 Control Unit, Leading Particulars . . . . . . . . . . . . . . . . . . . . . . . . 49Table 46 - KFS 594 Miniature Control Unit, Leading Particulars . . . . . . . . . . . . . . . . . 50Table 47 - KA 594 Bus Adapter, Leading Particulars . . . . . . . . . . . . . . . . . . . . . . . . . 51

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Table 48 - KAC 952 Power Amplifier/Antenna Coupler, Leading Particulars . . . . . . . 54Table 49 - KTR 953 Receiver/Exciter, Leading Particulars . . . . . . . . . . . . . . . . . . . . . 58Table 50 - KA 98 Antenna, Leading Particulars. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59Table 51 - KA 161 External Capacitor, Leading Particulars. . . . . . . . . . . . . . . . . . . . . 60Table 52 - KA 158 Bridging Amplifier, Leading Particulars . . . . . . . . . . . . . . . . . . . . . 61Table 53 - KA 160 Dual Antenna Adapter, Leading Particulars. . . . . . . . . . . . . . . . . . 62Table 54 - KA 162 Dual External Capacitor, Leading Particulars . . . . . . . . . . . . . . . . 63Table 55 - KHF 950 HF/SSB System, Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . 72Table 56 - Dual KHF 950 HF/SSB System Interlock Control Signals . . . . . . . . . . . . . 73Table 1001 - Transmitter Test Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1002Table 1002 - Fault Isolation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010Table 2001 - “V” and Long Wire Antenna Termination Considerations . . . . . . . . . . 2006Table 2002 - KCU 951 Control Unit Connector (J9511) Pin Name Definitions . . . . 2020Table 2003 - KFS 594 Miniature Control Unit Connector (J5941) . . . . . . . . . . . . . . 2022Table 2004 - KA 594 Bus Adapter Connector (P5941) Pin Name Definitions . . . . . 2026Table 2005 - KA 594 Bus Adapter Connector (P5942) Pin Name Definitions . . . . . 2027Table 2006 - KAC 952 Connector (P9524) Pin Name Definitions . . . . . . . . . . . . . . 2029Table 2007 - KAC 952 (-02,-12) Connector (P9526) Pin Name Definitions. . . . . . . 2031Table 2008 - KTR 953 Receiver/Exciter Connector (P9531) Pin Name Definitions 2035Table 2009 - KA 98 Connector (P982) Pin Name Definitions . . . . . . . . . . . . . . . . . 2036Table 2010 - KA 161 External Capacitor Connector (P1612) Pin Name Definitions 2037Table 2011 - KA 158 Connector (P1585) Pin Name Definitions . . . . . . . . . . . . . . . 2038Table 2012 - A 160 Connector (P1603) Pin Configuration . . . . . . . . . . . . . . . . . . . 2039Table 2013 - KA 162 Dual External Capacitor Connector (P1623) . . . . . . . . . . . . . 2040Table 2014 - KCU 951 Strapping Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2045Table 2015 - KA 594 / KFS 594 Strapping Option . . . . . . . . . . . . . . . . . . . . . . . . . . 2047Table 2017 - Inspection/Check Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2058

LOT-2Revision 2 23-20-03 Apr/2006


INTRODUCTION1. General

This manual provides description and operation, testing, fault isolation, installation, maintenance, and flight-line checkout procedures for the Bendix/King KHF 950 HF/SSB Communication System.

2. Layout of Manual

Section 1 “Description and Operation” Section 1000 “Testing and Fault Isolation” Section 2000 “Installation and Maintenance”

Refer to the “Table of Contents” for the location of applicable information.

Weights and measurements in the manual are in English units, unless otherwise stated.

3. Revision Service

The manual will be revised as necessary to reflect current information. Service Bulletins may be issued separately, and will be incorporated in the manual as appropriate.

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GLOSSARY

A/C Aircraft

AGC Automatic Gain Control

ALE Automatic Link Establishment

AME Amplitude Modulation Equivalent

ARM The ready to operate status state of a function or device.

CFR Clarifier

CLK Clock

COMP Compatible

CPLR Coupler

DIFF Diffused, Diffuser

GND Ground

HF High Frequency

LCD Liquid Crystal Display

LSB Lower Side Band

MIC Microphone

ORTHOGONAL Intersecting at right angles.

PA Power Amplifier

PROC Processing, Processor

PEP Peak Envelope Power

PTT Push To Talk

PWR Power

RCVR Receiver

RDY Ready

REF Reference

RF Radio Frequency

RTCA Radio Technical Commission for Aeronautics

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RTN Return

RX Receive

SELCAL SELective CALling

SELECTIVITY The ability of a receiver to differentiate desired RF signals from undesired signals and other disturbances within specified frequency and dB limits.

SENSITIVITY The ability of a receiver to detect and demodulate desired signals at specified minimum RF levels.

SIDETONE The small portion of the transmitter signal that is fed back to the receiver’s audio circuit.

SIG Signal

SQUELCH The ability to disable the demodulated output of a radio receiver until a preset level of RF input is received. The level of received RF signal required to break squelch is determined by the squelch control setting.

SSB Single Side Band

SYN Synthesize(r), Synchronize(r)

TCXO Temperature compensated crystal oscillator

TRANLINE Transmission Line

TX Transmit

USB Upper Side Band

VOL Volume

VSWR Voltage Standing Wave Ratio

XCTR Exciter (low level signal source that drives power amplified transmitted signal).

XMT Transmit

XMTR Transmitter

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DESCRIPTION AND OPERATION1. System Description

A basic Bendix/King KHF 950 HF/SSB Communication System consists of three individual units: KCU 951 Control Unit, KAC 952 Power Amplifier/Antenna Coupler, and the KTR 953 Receiver/Exciter. A KFS 594 Miniature Control Unit with KA 594 Bus Adapter may be used in place of the KCU 951 Control Unit. The KCU 1051 Control Display Unit may be used in place of the KCU 951 Control Unit for Automatic Link Establishment (ALE) operation, scanning and preset tuning capability.

NOTE: For complete installation information on the KFS 594 Miniature Control Unit and KA 594 Bus Adapter refer to the KFS 594 Installation/Maintenance Manual P/N 006-05575-XXXX and the KA 594 Installation/Maintenance Manual P/N 006-05543-XXXX.

NOTE: For complete installation information on the KCU 1051 Control Display Unit refer to the KCU 1051 Installation Manual P/N 006-10541-XXXX and KCU 1051 Maintenance Manual P/N 006-15541-XXXX.

Figure 1 - KCU 951 Control Unit

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Figure 2 - KFS 594 Miniature Control Unit

Figure 3 - KA 594 Bus Adapter



Figure 4 - KAC 952 Power Amplifier/Antenna Coupler

Figure 5 - KTR 953 Receiver/Exciter

Figure 6 - KA 98 Antenna



Figure 7 - KA 161 External Capacitor

Figure 8 - KA 158 Bridging Amplifier



Figure 9 - KA 160 Dual Antenna Adapter

Figure 10 - KA 162 Dual External Capacitor



Figure 11 - Typical Dual System Photo

1.A System Overview

The KHF 950 HF/SSB Communication System is a solid state design with 150 watts (PEP) of output power, operating at 28 Vdc. Frequency of operation ranges between 2.0 and 29.9999 MHz with 100 Hz resolution. Systems with a KCU 951 Control Unit may set the upper frequency limit to 22.9999 MHz or 26.9999 MHz.

NOTE: Operations are limited to 25 MHz for aircraft installation by aeronautical mobile band frequency limits.

A configuration is called a “dual system” when two KHF 950 HF/SSB systems are installed in the same aircraft to share one antenna. Both systems may receive simultaneously, but only one system is chosen to transmit at any one time. Either a manual or an auto select transmit scheme determines which system is selected to transmit. In a manual select system, a switch in the cockpit is used to determine if “System 1” or “System 2” will be used for transmitting. In an auto select configuration, the first system (System 1 or System 2) to be keyed is selected to transmit, and transmission from the other system is inhibited until the first system has stopped transmitting. Interconnect drawings for both manual and automatic selection are provided in this manual.



In a dual system when one system is transmitting, receive on the other is disabled. The single antenna in a dual system can be tuned to only one frequency at any given time. If the two systems are tuned to different frequencies the strongest reception is realized on the primary system, which is tuned to the same frequency as the antenna. The primary system is defined as the selected system in manual configuration, or the system that was last used for transmission in auto-select configuration.

A dual system requires certain accessory equipment: KA 158 Bridging Amplifiers and KA 160 Dual Antenna Adapter or KA 162 Dual External Capacitor (if required). The function of the KA 160 Dual Antenna Adapter and KA 162 Dual External Capacitor is to connect the antenna to the active antenna coupler. The function of the two KA 158 Bridging Amplifiers are to divide and route the received signal from the active antenna coupler to both KTR 953 Receiver/Exciters.

NOTE: A dual installation using a KA 98 probe antenna, shunt, notch, or short grounded wire antenna requires the use of the KA 162 Dual External Capacitor instead of a KA 160 Dual Antenna Adapter.

When two independent HF systems employing two separate antennas are used on one aircraft, it is important to maximize separation between the antennas. A minimum of 6 ft. (2 m.) separation is recommended, and the antennas should be configured as orthogonally as possible.

The KCU 951 Control Unit or KFS 594 Miniature Control Unit with KA 594 Bus Adapter determines the frequency and mode of operation of the system, and displays that information to the pilot. A remote mounted KA 594 Bus Adapter is required for systems that employ a KFS 594 Miniature Control Unit.

Receiver and low level transmitter signals are located in the KTR 953 Receiver/Exciter. Originally the KTR 953 Receiver/Exciter employed an oven controlled oscillator, which required a short warm-up period to generate the frequency reference required for the synthesizer. The oven controlled oscillator has been replaced by a temperature compensated crystal oscillator (TCXO), which provides an “instant on” frequency reference in current production models of the KTR 953 Receiver/Exciter.

The KAC 952 Power Amplifier/Antenna Coupler amplifies the excitation signal from the KTR 953 Receiver/Exciter to 150 watts PEP, or 37 watts of carrier power in AM. The amplified signal is routed into the antenna coupler section of the KAC 952 Power Amplifier/Antenna Coupler which matches the various impedances of the antenna to the 50 ohms output of the transmitter. In receive function, signals from the antenna pass through the antenna coupler to the KTR 953 Receiver/Exciter.



Accessory items include an 8.3 ft. (2.54 m.) KA 98 Antenna for applications where larger antennas are not practical. A KA 161 External Capacitor unit or KA 162 Dual External Capacitor unit is used to allow the antenna to more efficiently tune short grounded antennas. In a dual installation when two KHF 950 HF/SSB systems share one antenna, two KA 158 Bridging Amplifiers along with a KA 160 Dual Antenna Adapter or KA 162 Dual External Capacitor unit are required.

Figure 12 - Typical Single System Block Diagram



Figure 13 - Typical Dual System Block Diagram

Several operating mode options are available for the KHF 950 HF/SSB system to meet particular operational needs.

USB (upper sideband A3J) AME (amplitude modulation equivalent A3H) are standard modes of operation permitted on all system configurations.

LSB (lower sideband A3J) operation is not permitted for stations operating under Part 87 FCC (USA) regulations. LSB may be enabled for use in regions or applications where its use is authorized.

A seldom used mode A3A (USB reduced carrier) is available with the KCU 951 Control Unit for use in locations that may utilize the mode.

“Table 44 - Modes of Operation” lists the modes of operation applicable to the KCU 951 Control Unit and the KFS 594 Miniature Control Unit.



The system is capable of operating in a channel (frequency preset) mode or a direct frequency mode. A micro computer within the system provides the following functions:

• Controls the non-volatile storage of frequency, mode and channel data.• Controls a multiplexed eight-digit frequency display.• Provides synthesizer serial data tuning information.• Provides tune and transmit mode control logic.• Provides band switching information.

If the optional KCU 1051 Control Display Unit is used, the following additional capabilities are added:

• Automatic link establishment.• Preset antenna tune.• Frequency scanning.• Built in test with fault display.

1.B System Component Descriptions

The required and optional equipment of a KHF 950 HF/SSB Communication System is listed below:

• KCU 951 Control Unit (Required).• KFS 594 Miniature Control Unit (Optional replacement for KCU 951 Control

Unit. Used in conjunction with KA 594 Bus Adapter).• KA 594 Bus Adapter (Optional replacement for KCU 951 Control Unit. Used in

conjunction with KFS 594 Miniature Control Unit).• KAC 952 Power/Amplifier Coupler (Required. Version -02 required with shunt

antenna).• KTR 953 Receiver/Exciter (Required).• KA 98 Antenna (0ptional replacement for long wire antenna).• KA 161 External Capacitor (Required when system is used with shunt, notch,

or short grounded wire antenna).• KA 158 Bridging Amplifier (Required for dual installation when both system’s

receivers share a single antenna).• KA 160 Dual Antenna Adapter (Required for dual installation when a single long

wire antenna is used).• KA 162 Dual External Capacitor (Required for dual installation when a shunt,

notch, or short grounded wire antenna is used).



Component relationships for single and dual KHF 950 HF/SSB systems are shown in “Figure 14 - Typical KHF 950 Single System with Long Wire Antenna” , “Figure 15 - Typical KHF 950 Single System with Shunt Antenna or KA 98 Antenna” , “Figure 16 - Typical KHF 950 Dual System with Long Wire Antenna” , “Figure 17 - Typical KHF 950 Dual System with Shunt Antenna or KA 98 Antenna” , “Figure 16 - Typical KHF 950 Dual System with Long Wire Antenna” , “Figure 17 - Typical KHF 950 Dual System with Shunt Antenna or KA 98 Antenna” , “Figure 18 - KHF 950 Single System Component Relationships” , and “Figure 19 - KHF 950 Dual System Component Relationships” .

Figure 14 - Typical KHF 950 Single System with Long Wire Antenna



Figure 15 - Typical KHF 950 Single System with Shunt Antenna or KA 98 Antenna

Figure 16 - Typical KHF 950 Dual System with Long Wire Antenna



Figure 17 - Typical KHF 950 Dual System with Shunt Antenna or KA 98 Antenna

Figure 18 - KHF 950 Single System Component RelationshipsUsing KTR 953 Receiver/Exciter -51, -61



Figure 19 - KHF 950 Dual System Component RelationshipsUsing KTR 953 Receiver/Exciter -51, -61



1.B.(1) KCU 951 Control Unit (P/N 064-1016-XX)

The KCU 951 Control Unit provides 99 programmable channels plus 280,000 possible frequencies from 2.0 to 2.9999 MHz (at 100 Hz increments) but can be configured to operate in modes that reduce the upper frequency limit. Any channel can be preset to operate as semi-duplex, simplex, or receive only. The KCU 951 Control Unit uses non-volatile electrically erasable PROMs (EEPROMs) to store frequency, emission mode and channel data, even when the system is turned off. All necessary controls for operation of the KHF 950 HF/SSB system, including programming of the 99 preset channels, are on the The KCU 951 Control Unit. The KCU 951 Control Unit is mounted on Dzus rails.

1.B.(2) KFS 594 Miniature Control Unit (P/N 071-1274-XX)

The KFS 594 Miniature Control Unit along with the KA 594 Bus Adapter provides features and controls similar to the KCU 951 Control Unit. Systems that employ the KFS 594 Miniature Control Unit have 19 user programmable channels that may be programmed with simplex or semi-duplex frequency information. Mode information is not stored in the channel information. In addition to those 19 channels, all 245 ITU Public Correspondence Channels (High Seas Operator Frequencies) are permanently programmed into the unit. USB, LSB, and A3J modes of operation are available. For more complete information on the KFS 594 Miniature Control Unit refer to KFS 594 Installation/Maintenance Manual P/N 006-05575-XXXX and for the KA 594 Bus Adapter refer to KA 594 Installation/Maintenance Manual P/N 006-05543-XXXX.

1.B.(3) KA 594 Bus Adapter (P/N 071-1268-XX)

The KA 594 Bus Adapter allows the use of the smaller KFS 594 Miniature Control Unit with the KHF 950 HF/SSB system. The adapter decodes data from the KHF 950 HF/SSB system or the KFS 594 Miniature Control Unit for frequency/channel and tune monitoring. The unit is self-contained and is wired between the KHF 950 HF/SSB system and the KFS 594 Miniature Control Unit. The unit is available in two versions. The -00 version uses internal strapping for the LSB option, and the -01 version uses external strapping for the LSB option.

1.B.(4) KAC 952 Power/Amplifier Coupler (P/N 064-1017-XX)

The KAC 952 Power/Amplifier Coupler is mounted near the antenna to maximize efficiency. In transmit, the KAC 952 Power/Amplifier Coupler amplifies the excitation signal from the KTR 953 Receiver/Exciter to 150 watts PEP, or 37 watts of carrier power in AM. After filtering, the amplified signal is fed to the antenna coupler section of the KAC 952 Power/Amplifier Coupler.



The antenna coupler matches the various impedances of the antenna to the 50 ohms output of the transmitter. A microprocessor in the KAC 952 Power/Amplifier Coupler controls the antenna coupler and exchanges information with the KCU 951 Control Unit (or the KA 594 Bus Adapter). In receive, the signal from the antenna passes through the antenna coupler, but bypasses the amplifier section.

1.B.(5) KTR 953 Receiver/Exciter (P/N 064-1015-XX)

The KTR 953 Receiver/Exciter contains an HF receiver and supplies a low power transmit signal to the KAC 952 Power/Amplifier Coupler.

Some versions of the KTR 953 Receiver/Exciter support the SELCAL (SELective CALling) option. Both a standard SELCAL decoder (not furnished with the KHF 950 HF/SSB system) and a KHF 950 HF/SSB system (with the SELCAL option) are required for SELCAL operation. A system equipped with SELCAL may have the audio volume turned down completely to relieve background noise during flight. To contact the aircraft a coded audio signal is sent. The signal is decoded by the SELCAL decoder on board the aircraft, and a visual or audio signal is generated to notify the crew of the call.

Some versions of the KTR 953 Receiver/Exciter allow interface with data modems or secure voice systems. The KTR 953 Receiver/Exciter data versions are available in standard bandwidth (350 to 2500 Hz) or wide bandwidth (300 to 3150 Hz) versions. Wide bandwidth versions are not FCC type accepted or TSO approved. Also available are versions of the KTR 953 Receiver/Exciter that have a modified bandwidth (300 Hz to 2500 Hz passband, and a 4 kHz wide stopband).

1.B.(6) KA 98 Antenna (P/N 071-1252-XX)

The KA 98 Antenna is a short, light weight HF antenna for use with the KHF 950 HF/SSB system. The KA 98 Antenna can be used where conventional long wire antennas are impractical. The antenna is composed of two sections, whip and base. The whip section is designed to be easily removed from the base section for storage. The whip section is 100 inches long, but is designed to have an electrical length of 144 inches.

1.B.(7) KA 161 External Capacitor (P/N 071-1271-XX)

The KA 161 External Capacitor is an accessory unit in the KHF 950 HF/SSB system. The KA 161 External Capacitor is required when a shunt, notch, or short grounded wire antenna is used.



1.B.(8) KA 158 Bridging Amplifier (P/N 071-0019-XX)

The KA 158 Bridging Amplifier is an accessory unit in the KHF 950 HF/SSB system. The KA 158 Bridging Amplifier allows both receivers to operate from one antenna in a dual system installation. Two KA 158 Bridging Amplifiers are required for a dual installation, and mount directly on the front of each KAC 952 Power/Amplifier Coupler.

1.B.(9) KA 160 Dual Antenna Adapter (P/N 071-1269-XX)

The KA 160 Dual Antenna Adapter is an accessory unit in the KHF 950 HF/SSB system. The KA 160 Dual Antenna Adapter is required when a dual system installation is used with a single long wire antenna.

1.B.(10) KA 162 Dual External Capacitor (P/N 071-1270-XX)

The KA 162 Dual External Capacitor is an accessory unit in the KHF 950 HF/SSB system. The KA 162 Dual External Capacitor is required for a dual system installation when a shunt, notch, or short grounded wire antenna is used.

1.C Component Installation Kits Supplied

NOTE: One service notice P/N 006-00551-0000 is available with instructions for crimping crimp connectors.

1.C.(1) KCU 951 Control Unit Installation Kits

Table 1 - KCU 951 Installation Kit(P/N 050-01846-0001)

PART NUMBER DESCRIPTION

Kit 050-01846-0001Rev AA

Provides parts to mount one KCU 951 Control Unit(Straight exit).

(1) 030-01157-0011 Forty nine crimp connector sockets (20 AWG)

(2) 030-01176-0000 One 50 pin sub-D housing

(3) 030-01188-0000 One female polarizing pin

(4) 030-02351-0004 One E-style hood and lever assembly



Table 2 - KCU 951 Installation Kit(P/N 050-01846-0003)

1.C.(2) KFS 594 Miniature Control Unit Installation Kits

Table 3 - KFS 594 Installation Kit(P/N 050-01986-0001)


Kit 050-01846-0003Rev AA

Provides parts to mount one KCU 951 Control Unit(Side exit).




(4) 030-02351-0009 One D-style hood and lever assembly


Kit 050-01986-0001Rev 0

Provides parts to mount one KFS 594 Miniature Control Unit.

(1) 030-01157-0011 Twenty eight crimp connector sockets (20 AWG)



(4) 030-01222-0000 One hood and lever assembly

(5) 092-00052-0002 Two nut anchor 6-32



1.C.(3) KA 594 Bus Adapter Installation Kits

Table 4 - KA594 Installation Kit(P/N 050-01993-0001)


Kit 050-01993-0001Rev 1

Provides parts to mount one KA 594 Bus Adapter.


(2) 030-01159-0000 One 15 pin housing


(4) 030-01184-0011 Fifteen crimp contact pins (20 AWG)






1.C.(4) KAC 952 Power Amplifier/Antenna Coupler Installation Kits

Table 9 - KAC 952 Installation Kit(P/N 050-01847-0001)


Kit 050-01847-0001Rev 18

Provides parts to mount one KAC 952 -00,-01,-10,-11Power Amplifier/Antenna Coupler(Single system, Vertical mount).

(1) 030-00005-0000 One coax connector BNC UG 88C/U

(2) 030-00192-0000 One straight plug

(3) 030-01080-0000 Fourteen crimp connector contacts (20 AWG)

(4) 030-01085-0000 Four crimp connector contacts (16 AWG)

(5) 030-02364-0000 One connector chassis

(6) 047-05824-0001 One ground strap

(7) 047-05913-0001 Two 4.3 inch ground straps

(8) 047-06261-0036 One 36 inch conductor strip

(9) 052-00009-0004 Two vibration and shock mounts


(11) 071-04030-0000 One mounting rack

(12) 089-05909-0006 Four screws PHP 8-32 X 3/8





Kit 050-01847-0002Rev 9

Provides parts to mount one KAC 952 -00,-01,-02,-10,-11,-12Power Amplifier/Antenna Coupler (Bench harness).



(3) 030-00216-0000 One BNC to HN adapter

(4) 030-01077-0000 Seventeen female solder contacts

(5) 030-01082-0000 Four female solder contacts

(6) 030-02364-0000 One connector chassis female



(9) 076-01136-0002 One connector adapter

(10) 089-05909-0006 Four screws PHP 8-32 X 3/8





Kit 050-01847-0004Rev 10

Provides parts to mount one KAC 952 -02,-12Power Amplifier/Antenna Coupler(Single system, Vertical mount).






(6) 030-02513-0000 One connector PTO6CE



(9) 047-06261-0036 One 36 inch conductor strip




(13) 089-05909-0006 Four screws PHP 8-32 X 3/8





Kit 050-01847-0006Rev 8

Provides parts to mount dual KAC 952 -00,-01,-10,-11Power Amplifier/Antenna Coupler (Dual system).

(1) 030-00005-0000 Two coax connectors BNC UG 88C/U

(2) 030-00192-0000 Two straight plugs

(3) 030-01080-0000 Twenty eight crimp connector contacts (20 AWG)

(4) 030-01085-0000 Eight crimp connector contacts (16 AWG)

(5) 030-02364-0000 Two connector chassis female


(7) 047-06138-0003 One antenna strap right

(8) 047-06139-0001 One antenna strap left

(9) 047-06261-0036 Two 36 inch conductor strips

(10) 052-00009-0006 Four vibration and shock mounts

(11) 071-04041-0000 One dual mounting rack assembly

(12) 089-05909-0006 Four screws PHP 8-32 X 3/8

(13) 089-08006-0034 Four split lock washers #8





Kit 050-01847-0008Rev 9

Provides parts to mount dual KAC 952 -02,-12Power Amplifier/Antenna Coupler (Dual system).

(1) 030-00005-0000 Two coax connectors BNC UG 88C/U

(2) 030-00192-0000 Two straight plugs

(3) 030-01080-0000 Twenty eight crimp connector contacts (20 AWG)

(4) 030-01085-0000 Eight crimp connector contacts (16 AWG)

(5) 030-02364-0000 Two connector chassis female

(6) 030-02513-0000 Two connector PT06CE


(8) 047-06138-0003 One antenna strap right

(9) 047-06139-0001 One antenna strap left

(10) 047-06261-0036 Two 36 inch conductor strips


(12) 071-04041-0000 One dual mounting rack assembly

(13) 089-05909-0006 Four screws PHP 8-32 X 3/8






Kit 050-01847-0009Rev 4

Provides parts to mount one KAC 952 -02,-12Power Amplifier/Antenna Coupler (Reverse mounted).





(5) 030-02084-0000 One 10 pin connector female


(7) 047-06261-0036 One 36 inch conductor strips



(10) 071-04030-0001 One reverse rack

(11) 089-05909-0006 Four screws PHP 8-32 X 3/8


(13) 200-03116-0000 One mounting tray assembly



1.C.(5) KTR 953 Receiver/Exciter Installation Kits

Table 15 - KTR 953 Installation Kit(P/N 050-01848-0001)


Kit 050-01848-0001Rev AA

Provides parts to mount one KTR 953 Receiver/Exciter(Single system/Straight exit).

(1) 030-00005-0000 One coax connector BNC UG 88C/U (P9531)

(2) 030-01157-0011 Forty nine crimp connector sockets (20 AWG) PositronicsFC6020D-14

(3) 030-01176-0000 One 50 pin sub-D housing Positronics RD50F00000





(8) 071-04003-0003 One 3 inch mounting rack

(9) 089-05907-0006 Four screws PHP 6-32 X 3/8







Kit 050-01848-0003Rev AA

Provides parts to mount one KTR 953 Receiver/Exciter(Single system/Side exit).


(2) 030-01157-0011 Forty nine crimp connector sockets (20 AWG)Positronics FC6020D-14

(3) 030-01176-0000 One 50 pin sub-D housing Positronics RD50F00000


(5) 030-02351-0009 One D-style hood and lever assembly




(9) 089-05907-0006 Four screws PHP 6-32 X 3/8



Kit 050-01848-0004Rev 2

Provides parts to mount one KTR 953 Receiver/Exciter(Bench harness).


(2) 030-02350-0012 One sub-D CA 50S connector (P9532)



(5) 089-05907-0006 Four screws PHP 6-32 X 3/8






Kit 050-01848-0006Rev AA

Provides parts to mount dual KTR 953 Receiver/Exciter(Dual system/Straight exit).

(1) 030-00005-0000 Two coax connectors BNC UG 88C/U (P9531)

(2) 030-01157-0011 Ninety eight crimp connector sockets (20 AWG) PositronicsFC6020D-14

(3) 030-01176-0000 Two 50 pin sub-D housings Positronics RD50F00000

(4) 030-01188-0000 Two female polarizing pins

(5) 030-02351-0004 Two E-style hood and lever assemblies

(6) 047-05914-0001 Two ground straps



(9) 089-05909-0006 Four screws PHP 8-32 X 3/8






Kit 050-01848-0008Rev AA

Provides parts to mount dual KTR 953 Receiver/Exciter(Dual system/Side exit).

(1) 030-00005-0000 Two coax connectors BNC UG 88C/U (P9531)

(2) 030-01157-0011 Ninety eight crimp connector sockets (20 AWG) PositronicsFC6020D-14

(3) 030-01176-0000 Two 50 pin sub-D housings Positronics RD50F00000

(4) 030-01188-0000 Two female polarizing pins

(5) 030-02351-0009 Two D-style hood and lever assemblies

(6) 047-05914-0001 Two ground straps



(9) 089-05909-0006 Four screws PHP 8-32 X 3/8




1.C.(6) KA 98 Antenna Installation Kits

Table 20 - KA 98 Installation Kit(P/N 050-01987-0000)

1.C.(7) KA 161 External Capacitor Installation Kits



Kit 050-01987-0000Rev 2

Provides parts to mount one KA 98 Antenna.

(1) 030-02445-0000 One 6 pin connector (P982)

(2) 030-00192-0000 Two straight plugs (P9525)

(3) 047-06150-0001 Four clamps

(4) 076-01271-0001 Two studs

(5) 089-02022-0037 Two hex nuts 5/16-24

(6) 089-06034-0013 Four screws SHC 1/4-20 X 3/16

(7) 089-06190-0010 Two set screws 10-32 X 5/16

(8) 089-08010-0034 Two split lock washers 5/16


Kit 050-01991-0000Rev 1

Provides parts to mount one KA 161-00 External Capacitor(Dayton-Granger wire antenna termination).

(1) 030-00192-0000 One straight plug (P1611)


(3) 089-05910-0007 Six screws PHP 10-32 X 7/16

(4) 089-08216-0004 Six standard flat washers 0.203

(5) 091-00358-0000 One leadthru sleeve

(6) 091-00359-0000 One leadthru elbow

(7) 187-01264-0000 One feedthru gasket





1.C.(8) KA 158 Bridging Amplifier Installation Kits



Kit 050-01991-0001Rev 0

Provides parts to mount one KA 161-01 External Capacitor(Porcelain feedthru termination).

(1) 030-00192-0000 One straight plug (P1611)


(3) 047-06045-0001 One spacer

(4) 089-05907-0006 Four screws PHP 6-32 X 3/8

(5) 089-05907-0009 Six screws PHP 6-32 X 9/16


Kit 050-01991-0002Rev 1

Provides parts to mount one KA 161-02 External Capacitor(HN connector termination).

(1) 030-00192-0000 Two straight plugs (P1611)


(3) 089-05907-0006 Four screws PHP 6-32 X 3/8


Kit 050-01989-0000Rev 0

Provides parts to mount one KA 158 Bridging Amplifier.

(1) 030-00005-0000 Two coax connectors BNC UG 88C/U (P1581, P1582)




1.C.(9) KA 160 Dual Antenna Adapter Installation Kits




Kit 050-01990-0000Rev 1

Provides parts to mount one KA 160 -00 Dual Antenna Adapter(Dayton-Granger wire antenna termination).

(1) 030-00192-0000 Two straight plugs (P1601, P1602)


(3) 089-05910-0007 Six screws PHP 10-32 X 7/16

(4) 089-08216-0004 Six standard flat washers 0.203





Kit 050-01990-0001Rev 0

Provides parts to mount one KA 160 -01 Dual Antenna Adapter(Porcelain feedthru termination).



(3) 047-06054-0001 One spacer

(4) 089-05907-0006 Four screws PHP 6-32 X 3/8

(5) 089-05907-0009 Six screws PHP 6-32 X 9/16




1.C.(10) KA 162 Dual External Capacitor Installation Kits



Kit 050-01990-0002Rev 1

Provides parts to mount one KA 160 -02 Dual Antenna Adapter (Dayton-Granger wire antenna termination).







Kit 050-01992-0001Rev 0

Provides parts to mount one KA 162-01Dual External Capacitor (Porcelain feedthru termination).



(3) 047-06054-0001 One spacer

(4) 089-05907-0006 Four screws PHP 6-32 X 3/8

(5) 089-05907-0009 Six screws PHP 6-32 X 9/16




1.D Equipment Required But Not Supplied


Kit 050-01992-0002Rev 1

Provides parts to mount one KA 162-02Dual External Capacitor (HN connector termination).

(1) 030-00192-0000 Three straight plugs (P1621, P1622, P1624)


(3) 089-05907-0006 Four screws PHP 6-32 X 3/8

AIRCRAFT EQUIPMENT DESCRIPTION

Power: 28 Vdc Primary power source.

Lighting Bus:5 Vac, 5 Vdc, 14 Vdc, or 28 Vdc

Panel lighting power source for control units.

Microphone Noise cancelling, 150 ohms nominal, pre-amplified.

Headphones Approx. 600 ohms.

Selective Calling Decoder Motorola NA 135, or Terra Jetcall 2/5, or equivalent.

Required if SELCAL operation is desired. Also used with KTR 953 Receiver/Exciter versions -01, -11, -41, -51, -53, or -61.

90° HN Connector Available as P/N 030-00225-0000.

Special Fuse/Cap Block For installations with speech processing. Available as P/N 071-00029-0000.

Dzus Mounting Rail (Angle Type)

One foot section available as P/N 092-00050-0000.

Dzus Mounting Rail (Straight Type)

One foot section available as P/N 092-00045-0000.

Long Wire HF Antenna Long Wire HF Antenna Kit available as P/N 071-01214-0000. See “Figure 20 - Long Wire HF Antenna Kit P/N 071-01214-0000” .



Grounded Tranline Grounded tranline: Towel bar with 1 inch diameter recommended. Contact:Trivec-Avant Corp.17831 Jamestown Ln.Huntington Beach, CA 92647714-841-4976

Whip Antenna KA 98 HF Antenna available as P/N 071-1252-00 white, -01 olive drab.

WIRE: Available as:

RG 400 Double shielded coax P/N 024-00075-0000

RG 142B/U Double shielded coax P/N 024-00002-0000

24 AWG Single conductor P/N 025-00029-0009



24 AWG Single conductor with shield and jacket P/N 025-05018-0000

18 AWG Single conductor with shield and jacket P/N 025-05019-0000

24 AWG Two conductor with shield and jacket P/N 025-05020-0000

24 AWG Three conductor with shield and jacket P/N 025-05023-0000

CABLE:

AN-22a 755 Nominal Circular Mil Area*0.090 inches Max. Overall Diameter16.45 ohms Max. per 1000 ft. @ 20°C8 amps Max. Cont. Current Rating**5 amps Max. Cont. Current Rating***

AN-20 1,200 Nominal Circular Mil Area*0.100 inches Max. Overall Diameter10.25 ohms Max. per 1000 ft. @ 20°C11 amps Max. Cont. Current Rating**7.5 amps Max. Cont. Current Rating***




Table 30 - Aircraft Equipment Required But Not Supplied

AN-18 1,909 Nominal Circular Mil Area*0.115 inches Max. Overall Diameter6.44 ohms Max. per 1000 ft. @ 20°C16 amps Max. Cont. Current Rating**10 amps Max. Cont. Current Rating***

AN-16 2,409 Nominal Circular Mil Area0.130 inches Max. Overall Diameter4.76 ohms Max. per 1000 ft. @ 20°C22 amps Max. Cont. Current Rating**13 amps Max. Cont. Current Rating***




* Cable Specification AN-J-C-48.** Single Cable in free air.*** Cable in conduit or bundles with only three cables, or 20 percent of the bundle, whichever is greater.

Miscellaneous Installation hardware, mounting brackets, wire, cables, nuts, bolts.




Figure 20 - Long Wire HF Antenna Kit P/N 071-01214-0000

1.E Optional (Non-essential) Aircraft Equipment

Reserved for future use.



1.F Related Publications

Table 31 - Related Publications

NOTE: An Aircraft Station License is required for KHF 950 HF/SSB system equipment. Forms (FCC Form 404, New Aircraft Station License, or FCC 405A, Renewal of Aircraft Station License) can be obtained from the nearest FCC Field Office.

This equipment has been type accepted by the FCC and entered on their list of type accepted equipment as ASY90QKHF950 and must be identified as such on your FCC Form for aircraft radio station license application or renewal.

PUBLICATIONHONEYWELL

PART NUMBERATANO.

KHF 950/990 Pilot’s Guide 006-18038-XXXX N/A

KCU 951 Maintenance Manual 006-05379-XXXX 23-20-04

KFS 594 Installation/Maintenance Manual 006-05575-XXXX 23-20-05

KA 594 Installation/Maintenance Manual 006-05543-XXXX 23-20-06

KAC 952 Maintenance Manual 006-05380-XXXX 23-20-07

KTR 953 Maintenance Manual 006-05381-XXXX 23-20-08

KA 98 Maintenance Manual 006-05567-XXXX 23-20-09





KCU 1051 Installation Manual 006-10541-XXXX 23-20-21

KCU 1051 Maintenance Manual 006-15541-XXXX 23-20-22



2. Component Configurations

System component configurations are listed in this section. The overall configuration of a KHF 950 HF/SSB system is dependent on the component versions installed in the aircraft.

2.A KCU 951 Control Unit Configurations

Table 32 - KCU 951 Control Unit, Configurations Available

2.B KFS 594 Miniature Control Unit Configurations

Table 33 - KFS 594 Miniature Control Unit, Configurations Available

PART NUMBER VERSION LAMPS BEZEL 23 MHZ LIMIT

064-1016- -00 28V Black No

064-1016- -01 5V Black No

064-1016- -02 28V Gray No

064-1016- -03 5V Gray No

064-1016- -04 28V Red Black No

064-1016- -10 28V Black Yes

064-1016- -11 5V Black Yes

064-1016- -12 28V Gray Yes

064-1016- -13 5V Gray Yes

064-1016- -14 28V Red Black Yes

PART NUMBER VERSION LAMPS BEZEL LENS

071-1274- -00 5V Black DIFF

071-1274- -01 28V Black DIFF

071-1274- -02 5V Gray DIFF

071-1274- -03 28V Gray DIFF

071-1274- -04 28V Black SHINY



2.C KA 594 Bus Adapter Configurations

Table 34 - KA 594 Bus Adapter, Configurations Available

2.D KAC 952 Power Amplifier/Antenna Coupler Configurations

Table 36 - KAC 952 Power Amplifier/Antenna Coupler, Configurations Available

PART NUMBER VERSION LSB OPTION STRAPPING

071-1268- -00 LSB option strapping internal

071-1268- -01 LSB option strapping external

PART NUMBER VERSIONEXTERNALCAPACITOR

CONNECTOR

EXPLOSIONPROOF

COMPATIBLEONLY WITHKCU 1051

064-1017- -00 No No No

064-1017- -01 No Yes No

064-1017- -02 Yes Yes No

064-1017- -10 No No Yes

064-1017- -11 No Yes Yes

064-1017- -12 Yes Yes Yes



2.E KTR 953 Receiver/Exciter Configurations

Table 37 - KTR 953 Receiver/Exciter, Configurations Available

PART NUMBER

VERS. SELCALSPEECHPROC.

BANDWIDTHFAST

SYNTHLOCK

064-1015- -00 No No 350 Hz to 2500 Hz No

064-1015- -01 Yes No 350 Hz to 2500 Hz No

064-1015- -10 No Yes 350 Hz to 2500 Hz No

064-1015- -11 Yes Yes 350 Hz to 2500 Hz No

064-1015- -40 No No 350 Hz to 2500 Hz and4 kHz stopband

No

064-1015- -41 Yes No 350 Hz to 2500 Hz and4 kHz stopband

No

064-1015- -51* Yes No 350 Hz to 3150 Hz Data

No

064-1015- -53 Yes No 350 Hz to 2500 Hz Data

No

064-1015- -61** Yes No 350 Hz to 2500 Hz Yes

* Since the bandwidth of KTR 953 -51 exceeds that allowed for FCC type acceptance and TSO approval, the KTR 953 -51 is not FCC type accepted or TSO approved. Therefore, the KTR 953 -51 is valid for operation only where FCC type acceptance and TSO approval is not applicable. The serial tag for KTR 953 -51 does not include FCC identification or TSO information.



2.F KA 98 Antenna Configurations

Table 38 - KA 98 Antenna, Configurations Available

2.G Long Wire HF Antenna Configurations

Table 39 - Long Wire HF Antenna, Configurations Available

2.H KA 161 External Capacitor Configurations

Table 40 - KA 161 External Capacitor, Configurations Available

2.I KA 158 Bridging Amplifier Configurations

Table 41 - KA 158 Bridging Amplifier, Configurations Available

PART NUMBER VERSION FEATURES

071-1252- -00 White

071-1252- -01 Olive Drab


071-01214- -0000 Grounded, 30-45 feet(9.15 to 13.7 meters)

PART NUMBER VERSIONANTENNA

TERMINATION

071-1271- -00 Dayton-Granger

071-1271- -01 Porcelain feedthru

071-1271- -02 HN antenna connector


071-0019- -00 Only version.



2.J KA 160 Dual Antenna Adapter Configurations

Table 42 - KA 160 Dual Antenna Adapter, Configurations Available

2.K KA 162 Dual External Capacitor Configurations

Table 43 - KA 162 Dual External Capacitor, Configurations Available


TERMINATION





TERMINATION


071-1270- -02 HN antenna connector



3. System Leading Particulars

3.A General Specifications

The KHF 950 HF/SSB system is a solid state design with 150 watts PEP of output power, supplied by 28 Vdc, with an operational frequency range of 2.0 to 29.9999 MHz with 100 Hz resolution. The KHF 950 HF/SSB system has been type accepted by the FCC and TSO approved, except for systems with the KTR 953 -51 Receiver/Exciter wide band version. The KHF 950 HF/SSB system is type listed as ASY90QKHF950.

NOTE: Since the bandwidth of the KTR 953 Receiver/Exciter P/N 064-1015-51 exceeds that allowed for FCC type acceptance and TSO approval, KHF 950 HF/SSB systems that use the KTR 953 -51 wide bandwidth version are not FCC type accepted or TSO approved. Therefore, KHF 950 HF/SSB systems that use the KTR 953 -51 wide bandwidth version are valid for operation only where FCC type acceptance and TSO approval is not applicable.

3.A.(1) SPEAKER OUT/DATA OUT 1

NOTE: DATA OUT 1 is available only on systems with KTR 953 Receiver/Exciter versions -51 or -53.

When the KHF 950 HF/SSB system is in a non-data receive mode, normal volume controlled audio is available at the speaker output (500 ohms).

When the KHF 950 HF/SSB system is in the data receive mode the speaker output becomes the DATA OUT 1 port. The DATA OUT 1 port audio is fixed and cannot be changed by the volume control on the system control head. The level is factory adjusted to 0 dBm (500 ohms) but can be field adjusted from -25 dBm to +10 dBm (refer to Paragraph “10. System Maintenance Programs” ). The squelch setting still has control over DATA OUT 1. Data sidetone is present at the DATA OUT 1 port in the data transmit mode.



3.A.(2) DATA OUT 2

NOTE: DATA OUT 2 is available only on systems with KTR 953 Receiver/Exciter versions -51 or -53.

DATA OUT 2 is an independent 600 ohms data output port which is active only in the data mode. The DATA OUT 2 output is set to a fixed level of 0 dBm at the factory, but can be field adjusted from -49 dBm to +10 dBm (refer to Paragraph “10. System Maintenance Programs” ). DATA OUT 2 output is not affected by the volume control or the squelch setting. Data sidetone is present at the DATA OUT 2 port in the data transmit mode.

The two data outputs may be used simultaneously. For example, when DATA OUT 2 is used as the primary data output, DATA OUT 1 may be adjusted to a level that will provide the operator with a sidetone in the speaker.

3.A.(3) DATA INPUT

When the DATA INPUT is pulled to ground (2 mA sink current) the KTR 953 Receiver/Exciter is placed in the data mode. For normal voice operation that line should be allowed to float to +12 Vdc.

3.A.(4) Transmitter Output Power

The KAC 952 Power Amplifier/Antenna Coupler contains two different power detectors. One is an average power detector set to approximately 38 watts. The other is a peak power detector set to 100 watts PEP. With single tone modulation (CW) the average power detector takes authority and limits the output power to approximately 38 watts. With multiple simultaneous modulating tones such as voice or certain forms of data, where the average power is below 38 watts, the peak power detector takes authority and limits the output power to approximately 150 watts PEP.

3.A.(5) Duty Cycle

The KHF 950 HF/SSB system is designed for continuous duty cycle (transmit) at 150 watts PEP for voice transmission on single sideband (SSB) only. On all other types of transmissions, the unit operates continuously, but after an extended period of transmission the power begins to back down to protect the power amplifier from overheating. The exact time depends on a number of factors such as ambient temperature, air pressure (altitude), duty cycle, transmission time, and air movement across the KAC 952 Power Amplifier/Antenna Coupler heat sink.



3.A.(6) Transmit/Receive Switching Delay Times (-53 Data types)

The KHF 950 HF/SSB system is not intended for modes of operation that employ rapid switching between transmit and receive modes. Typical transmit to receive time is 75 msec.

System delays (group delay) for a signal passing through either the transmitter or receiver range from 0.8 msec to 2 sec.

3.B System Operating Modes

3.B.(1) Emission Modes

Several operating mode options are available for the KHF 950 HF/SSB system to meet particular operational needs.

USB (upper sideband A3J) AME (amplitude modulation equivalent A3H) are standard modes of operation permitted on all system configurations.

LSB (lower sideband A3J) operation is not permitted for stations operating under Part 87 FCC (USA) regulations. LSB may be enabled for use in regions or applications where its use is authorized.

A seldom used mode A3A (USB reduced carrier) is available with the KCU 951 Control Unit for use in locations that may utilize the mode.

“Table 44 - Modes of Operation” lists the modes of operation applicable to the KCU 951 Control Unit and the KFS 594 Miniature Control Unit.

Table 44 - Modes of Operation

MODE OF OPERATION DESIGNATORCONTROL UNIT DESIGNATOR

COMMON ALTERNATE KCU 951 KFS 594

A3H AME - AM Equivalent AM AM

A3A AM Reduced Carrier AM + USB

Not Active

A3J USB - Upper Sideband USB USB

A3J LSB - Lower Sideband LSB LSB



3.B.(2) 23 MHz Limit Mode

The KHF 950 HF/SSB system can be strapped to limit the frequency of operation to an upper limit of 23 MHz.

3.B.(3) 27 MHz Limit Mode

The KHF 950 HF/SSB system can be strapped to limit the frequency of operation to an upper limit of 27 MHz.

3.B.(4) Rollover Mode Frequency and Channel Selection

The KHF 950 HF/SSB system can be strapped to allow frequency and channel rollover. Rollover mode allows the user to select frequencies or channels as one continuous series that loops back. When a 9 digit is displayed the next increase in that digit generates a carrier 1 for the next higher digit in the series and changes the digit displayed to a 0. When a 0 digit is displayed the next decrease in that digit generates a borrow 1 for the next lower digit in the series and changes the digit displayed to a 9. This scheme allows the user to select frequencies or channels in a continuous manner with the minimum number of digit changes. Refer to Paragraph “4. System Function” for more description of the rollover mode.

3.B.(5) Non-Rollover Mode Frequency and Channel Selection

The KHF 950 HF/SSB system can be strapped for a non-rollover mode of operation. Non-rollover mode allows the user to select frequencies or channels in a direct manner. When a 9 digit is displayed the next increase in that digit changes the digit displayed to a 0 but no carrier 1 is generated. When a 0 digit is displayed the next decrease in that digit changes the digit displayed to a 9, but no borrow 1 is generated. This results in a non-continuous but direct method of selecting frequencies or channels. Refer to Paragraph “4. System Function” for more description of the non-rollover mode.

3.B.(6) Channel Mode

When operating in the channel mode the KHF 950 HF/SSB system can operate as a simplex, or semi-simplex, or receive only communication system. Transmit and receive frequencies are selected by selecting a pre-programmed channel.

NOTE: Any channel containing a frequency above the selected limit will be altered. Those channels should be re-programmed by the user for frequencies within the frequency limit.



3.B.(7) Direct Frequency Mode

When operating in the direct frequency mode the KHF 950 HF/SSB system can operate as a simple communication system only. Transmit and receive frequency is determined by the selected frequency, which is entered directly on the control unit.

3.B.(8) Data Mode

When the KTR 953 Receiver/Exciter is operating in the DATA mode, interface with data modems or secure voice systems is enabled. The AUDIO OUT interface is used to provide the DATA OUT 1. The output level of the DATA OUT 1 is established at a fixed level by the factory or by field adjustment (refer to Paragraph “10. System Maintenance Programs” ).

A 4 dB variation is possible in the audio response when operating in the data mode (systems using KTR 953 Receiver/Exciter versions -00, -01, -10, -11, -40, -41, -53, -61).

3.B.(9) SELCAL Mode

NOTE: SELCAL mode requires a SELCAL decoder, not supplied.

SELCAL (SELective CALling) may be used to relieve background noises during flight. The volume may be turned down completely while the system maintains a watch for a SELCAL coded audio signal. When a decoded SELCAL signal is received, a call waiting is indicated. The SELCAL decoder generates an audio alert for the crew.



3.C Component Leading Particulars

Leading particulars for components of the KHF 950 HF/SSB system are listed below.

3.C.(1) KCU 951 Control Unit, Leading Particulars

Table 45 - KCU 951 Control Unit, Leading Particulars

CHARACTERISTIC DESCRIPTION

Weight: Refer to “Figure 2028 - KCU 951 Control Unit Outline and Mounting Drawing”

Dimensions: Refer to “Figure 2028 - KCU 951 Control Unit Outline and Mounting Drawing”

Temperature Range:

Operating: -20°C to +55°C

Storage: -55°C to +85°C

Power Requirements: +27.5 Vdc, supplied by KTR 953.

Lighting Power:

-00, -02, -04, -10, -12, -14

27.5 Vdc @ 140 mA

-01, -03, -11, -13 5 Vdc @ 840 mA

Connector: Refer to “Figure 2011 - KCU 951 Control Unit Connector (J9511) Pin Configuration” and “Table 2002 - KCU 951 Control Unit Connector (J9511) Pin Name Definitions”

TSO: C31c, C32c, DO-163, DO-160 Env. Cat. D1A/KPS/XXXXXXABAAB



3.C.(2) KFS 594 Miniature Control Unit, Leading Particulars

NOTE: Refer to the KFS 594 Installation/Maintenance Manual P/N 006-05575-XXXX for more description of the KFS 594.

Table 46 - KFS 594 Miniature Control Unit, Leading Particulars


Weight: Refer to “Figure 2029 - KFS 594 Outline and Mounting Drawing”

Dimensions: Refer to “Figure 2029 - KFS 594 Outline and Mounting Drawing”

Temperature Range: -20°C to +55°C

Altitude: +50,000 ft.

Power Requirements: 9 to 32 Vdc @ 4 watts

Lighting Power:

-01, -03, -04 27.5 Vdc

-00, -02 5 Vdc

Connector: Refer to “Figure 2012 - KFS 594 Miniature Control Unit Connector (J5941)” “Table 2003 - KFS 594 Miniature Control Unit Connector (J5941)”

TSO: C74c, DO-160A Env. Cat. A1A/KPS/XXXXXXABAAA

Applicable Document: RTCA DO-163



3.C.(3) KA 594 Bus Adapter, Leading Particulars

NOTE: Refer to the KA 594 Installation/Maintenance Manual P/N 006-05543-XXXX for more description of the KA 594.

Table 47 - KA 594 Bus Adapter, Leading Particulars


Weight: Refer to “Figure 2030 - KA 594 Outline and Mounting Drawing”

Dimensions: Refer to “Figure 2030 - KA 594 Outline and Mounting Drawing”

Power Requirements: +5 Vdc @ 350 mA (supplied by KTR 953)

+12 Vdc @ 100 mA

-26 Vdc @ 35 mA

Connectors: Refer to “Figure 2013 - KA 594 Bus Adapter Connector (P5941) Pin Configuration” and “Table 2004 - KA 594 Bus Adapter Connector (P5941) Pin Name Definitions” Refer to “Figure 2014 - KA 594 Bus Adapter Connector (P5942) Pin Configuration” and “Table 2005 - KA 594 Bus Adapter Connector (P5942) Pin Name Definitions” .

TSO: C31c, C32c, DO-160A Env. Cat. D2A/MNO/XXXXXXABAAA



3.C.(4) KAC 952 Power Amplifier/Antenna Coupler, Leading Particulars


Weight: Refer to “Figure 2031 - KAC 952 Outline and Mounting Drawing”

Dimensions: Refer to “Figure 2031 - KAC 952 Outline and Mounting Drawing”

Temperature Range:



Altitude: +50,000 ft.

Power Requirements: +27.5 Vdc

Receive Current: 1 A

Transmit Current: 15 A - Average of current envelope during sideband voice modulation or AME with or without voice modulation.

20 A - RMS of peak current during P.E.P. of sideband voice modulation or AME with or without voice modulation.

28 A - Peak current (1.414 X RMS) during P.E.P. of sideband voice modulation or AME with or without voice modulation.

Connectors: Refer to “Figure 2015 - KAC 952 Connector (P9524) Pin Configuration” and “Table 2006 - KAC 952 Connector (P9524) Pin Name Definitions” .Refer to “Figure 2016 - KAC 952 (-02,-12) Connector (P9526) Pin Configuration” and “Table 2007 - KAC 952 (-02,-12) Connector (P9526) Pin Name Definitions” .

TSO Compliance:

-00, -10 C31c, C32c, DO-163DO-160 Env. Cat. D2A/JYL/XXXXXXBBAAB

-01, -02, -11, -12 C31c, C32c, DO-163DO-160 Env. Cat. D2A/JYL/XXXXXXBBAABDO-160A Sect 9 Env. Cat. E



Applicable Documents: RTCA DO-160, DO-160A, DO-163CFR Part 81, 83, 87, 90 (FCC)CFR Part 37 (FAA)

Transmitter Input Impedance: 50 ohms nominal

Transmitter Input Level: -5 dBm PEP nominal, 0 dBm PEP maximum

Transmitter Input Frequency: 2 to 29.9999 MHz

Power Output of Transmitter into a 50 ohms Nonreactive Load:

SSB: 150 watts PEP (-1.5 dB at 8% Lo line or at -55°C

AM: 37.5 watts carrier, 150 watts PEP (-1.5 dB at 8% Lo line)

Harmonic & Spurious Suppression (USB):

65 dB, +8 kHz, -6 kHz from carrier frequency

3rd Order Intermodulation Distortion:

Relative to mean power output: -27 dB

Relative to PEP output: -30 dB

Carrier and Noise Level:

A3H with 1 kHz Audio Modulation:

-30 dB below 85% modulated output

A3J with 2 kHz Audio Modulation:

Less than 5% of 37.5 watts PEP

Power Capability: 150 watts PEP

VSWR: Less than 1.5:1 typical, 2:1 maximum. After initial tune-up, VSWR may rise to 3.6:1 before a retune sequence is required.

Antenna Tuning Time: 3 seconds nominal, 45 sec. maximum.

Antenna Matching Capability:




Table 48 - KAC 952 Power Amplifier/Antenna Coupler, Leading Particulars

Wire Antenna: 10-25 feet grounded (55,000 ft. max altitude). 30-75 feet ungrounded (30,000 ft. max altitude). 25-30 feet may be grounded or ungrounded. If grounded, 30,000 ft. max altitude.

NOTE: Altitude limits not applicable if KAC 952 is mounted in a pressurized environment.

Whip Antenna: KA 98

Protective Devices: Over voltage in the coupler, over temperature in the power amplifier, or failed transmitter output annunciates a system fault. Should the coupler not be able to tune the antenna at a given frequency, a system fault results after the coupler has attempted different network configurations to tune the antenna.




3.C.(5) KTR 953 Receiver/Exciter, Leading Particulars


Weight: Refer to “Figure 2032 - KTR 953 Outline and Mounting Drawing”

Dimensions: Refer to “Figure 2032 - KTR 953 Outline and Mounting Drawing”

Temperature Range:



Power Requirements: +27.5 Vdc, 3 A Peak, 1 A nominal, including power supplied to KCU 951.

Connector: Refer to “Figure 2017 - KTR 953 Receiver/Exciter Connector (P9531) Pin Configuration” and “Table 2008 - KTR 953 Receiver/Exciter Connector (P9531) Pin Name Definitions”

TSO:(Except -51, Note 1)

C31c, C32c, DO-163DO-160 Env. Cat. D2A/MNO/XXXXXXBBAABDO-160A Sect 9 Env. Cat. E

Applicable Documents:(Except -51, Note 1)

RTCA DO-160, DO-160A, DO-163CFR Part 81, 83, 87, 90 (FCC)

RECEIVER:

Input Impedance: 50 ohms nominal

Frequency Stability: ± 20 Hz

Clarifier Range: Up to ± 250 Hz depending on frequency (17 Hz @ 2 MHz, -250 Hz @ 30 MHz)

Selectivity:

AM (A3H): 5.5 kHz not more than 6 dB20.0 kHz not less than 60 dB

USB(-00,-01,-10, -11,-53,-61):(LSB similar)

f carrier +350 Hz to f carrier +2500 Hz not more than 6 dB (not more than 3 dB in Data Mode for -53 unit, Note 2).f carrier -1500 Hz to f carrier +4500 Hz not less than 60 dB.



USB(-40, -41):(LSB similar)

f carrier +300 Hz to f carrier +2500 Hz Hz not more than 6 dB.f carrier -600 Hz to f carrier +3400 Hz not less than 60 dB.

USB(-51, Note 1):

f carrier -300 Hz to f carrier +3150 Hz not more than 6 dB (not more than 3 dB in Data mode, Note 2).f carrier -1500 Hz to f carrier +5000 Hz not less than 60 dB.

Sensitivity:

A3A: Same as SSB

AME (A3H): Not more than 3μV for 6 dB (S + N/N), (Note 3).

SSB (A3J): Not more than 1μV for 10 dB (S + N/N).

AGC: No more than 6 dB change for 10 μV to 500,000 μV input.

RCVR/Sidetone Audio Output: Adjustable 10-100 mW max into 500 ohms

Optional SELCAL Audio Output: (-01,-11,-41,-51,-53,-61)

0.5 Vrms across 500 ohms

Optional Data Audio Outputs: (-51,-53)

DATA OUT 1: Factory set to 0 dBm into 500 ohms

DATA OUT 2: Factory set to 0 dBm into 600 ohms

Both Data Outputs are field adjustable from -25 dBm to +10 dBm.

Audio Response:

USB: (-00,-01,-11,-53,-61)

Not more than 6 dB from 350 Hz to 2500 Hz (not more than 3 dBm in Data mode for -53 unit, Note 2).

USB: (-40, -41) Not more than 6 dB from 300 Hz to 2500 Hz

USB: (-51, Note 1) Not more than 6 dB from 300 Hz to 3150 Hz (not more than 3 dB in Data mode, Note 2)




Audio Distortion:

AM: Not more than 12% harmonic distortion

SSB: Third order 25 dB below desired @ 100,000μV.

Spurious Response: Greater than 60 dB down 0.19 to 150 MHz

EXCITER:

Output Impedance: 50 ohms nominal

Frequency Stability: ± 20 Hz

Spectrum Control:

Audio Distortion:(-00,-01,-40,-41,-51,-53,-61)

In band harmonics more than 25 dB below tone.

Carrier Suppression, A3J More than 26 dB

Carrier Reduction, A3A 16 dB nominal

Carrier Level, A3H NMT 6 dB Below PEP

Power Output: 0 dBm maximum PEP output with spectrum control specifications.

ALC Range: 25 dB minimum

Optional Data Inputs:

(-01,-11,-41,-61): Typical 1.6 Vrms (+6.4 dBm into 600 ohms) balanced.

(-51,-53: Note 1 and Note 4) Factory set for 0.77 Vrms (0 dBm into 600 ohms) balanced. Field adjustable -10 to +10 dBm into 600 ohms.

NOTES:

(1) Since the bandwidth of the KTR 953 -51 Receiver/Exciter exceeds that allowed for FCC type acceptance and TSO approval, the KTR 953 -51 version is not FCC type accepted or TSO approved. Therefore the KTR 953 -51 is valid for operation only where FCC type acceptance or TSO approval is not applicable. A special serial tag is used on a KTR 953 -51, which does not include FCC identification or TSO information.

(2) 4 dB variation is possible in the DATA mode at temperature extremes.




Table 49 - KTR 953 Receiver/Exciter, Leading Particulars

(3) Internally generated receiver spurious responses may degrade sensitivity below those specified on a limited number of frequencies. A sensitivity of less than 6 dB signal/noise for a 2 microvolt SSB input signal may be noted on some channels outside the frequency limits of the aeronautical mobile band (25 MHz Limit) and maritime mobile bands. Equivalent degradation may be noted in the AM mode. Contact Product Support (913) 782-0600 regarding specific frequencies of interest.

(4) A KHF 950 HF/SSB system employing a KTR 953 -53 Receiver/Exciter is FCC type accepted for J2B and J7B modes of operation.




3.C.(6) KA 98 Antenna, Leading Particulars

Table 50 - KA 98 Antenna, Leading Particulars


TSO Compliance: C31c, DO-160 Env. Cat C2/A/UVW/XXXXXXBBA

Weight: 2.5 lbs. (1.132 kg).

Dimensions: Refer to “Figure 2033 - KA 98 Outline and Mounting Drawing”

Base: 2 inch diameter by 16 inches long.

Whip: 100 inches long by 1.25 inches diameter at the base tapering to 0.25 inch diameter at the far end of the antenna.


Altitude: 0 to 35,000 ft.

Vibration: Tested to vibration curves V, W and U as specified for helicopters in RTCA paper DO-160.

Power Requirements: 14 to 33 Vdc, to operate band relay

Frequency Range: 2 to 30 MHz

Input Power: 150 watts PEP or 38 watts average

Input Impedance: Compatible with Bendix/King KHF 950 HF/SSB Communication System.

Connector: Refer to “Figure 2018 - KA 98 Connector (P982) Pin Configuration” and “Table 2009 - KA 98 Connector (P982) Pin Name Definitions”



3.C.(7) KA 161 External Capacitor, Leading Particulars

Table 51 - KA 161 External Capacitor, Leading Particulars


Input: RF Transmitter Power from KAC 952 Power Amplifier/Antenna Coupler.

Output: To shunt, notch, or short wire grounded antenna.

Weight:

-00 Refer to “Figure 2034 - KA 161 External Capacitor (-00) Outline and Mounting Drawing”



Dimensions:







Connector: Refer to “Figure 2019 - KA 161 External Capacitor Connector (P1612) Pin Configuration” and “Table 2010 - KA 161 External Capacitor Connector (P1612) Pin Name Definitions”



3.C.(8) KA 158 Bridging Amplifier, Leading Particulars

Table 52 - KA 158 Bridging Amplifier, Leading Particulars


Wide Band Amplifier:

Input Impedance: 600 ohms

Output Impedance: 50 ohms

Gain: Unity to 6 dB

Weight: 0.4 lbs (0.182 kg).

Dimensions: Refer to “Figure 2037 - Dual KAC 952 Outline and Mounting” for dimensions of KAC 952 Power Amplifier/Antenna Coupler with KA 158 Bridging Amplifier attached.

Length: 3.65 inches (9.27 cm.)

Width: 2.65 inches (6.73 cm.)

Height: 2.003 inches (5.09 cm.)




Connector: Refer to “Table 2011 - KA 158 Connector (P1585) Pin Name Definitions”



3.C.(9) KA 160 Dual Antenna Adapter, Leading Particulars

Table 53 - KA 160 Dual Antenna Adapter, Leading Particulars


Weight:

-00 Refer to “Figure 2039 - KA 160 Dual Antenna Adapter (-00) Outline and Mounting Drawing”



Dimensions:







Connector: Refer to “Figure 2021 - KA 160 Connector (P1603) Pin Configuration” and “Table 2012 - A 160 Connector (P1603) Pin Configuration”



3.C.(10) KA 162 Dual External Capacitor, Leading Particulars

Table 54 - KA 162 Dual External Capacitor, Leading Particulars


Weight:

-01 Refer to “Figure 2042 - KA 162 Dual External Capacitor (-01)”


Dimensions:






Input: RF Transmitter Power from KAC 952 Power Amplifier/Antenna Coupler.

Output: To shunt, notch or short grounded antennas.

Connector: Refer to “Figure 2022 - KA 162 Connector (P1623) Pin Configuration” and “Table 2013 - KA 162 Dual External Capacitor Connector (P1623)”



4. System Function

4.A System Functional Overview

The Bendix/King KHF 950 HF/SSB Communication System supports a wide variety of communication requirements. System capabilities can be matched to user requirements through choice of system components. The major components of the KHF 950 HF/SSB system are listed below:

• KCU 951 Control Unit• KFS 594 Miniature Control Unit• KA 594 Bus Adapter• KAC 952 Power Amplifier/Antenna Coupler• KTR 953 Receiver/Exciter• KA 98 Antenna• KA 161 External Capacitor• KA 160 Dual Antenna Adapter• KA 162 Dual External Capacitor

The basic KHF 950 HF/SSB system is a mobile communication system for aircraft. It operates in a frequency range between 2.0 and 29.9999 MHz offering several different emission modes to provide voice communication.

By including the appropriate components in an installation, the KHF 950 HF/SSB system capabilities can be increased to allow the system to support Data, SelCal, and Secure Voice communication.

NOTE: Some systems require special versions of system components and special wiring considerations to be part of the original installation and are not intended as an upgrade.

An installation may employ two systems in a dual configuration where both systems share a common antenna. Both systems are allowed to receive simultaneously, but only one system is allowed to transmit at a time. An Auto Select or Manual Select scheme is employed to select which system is transmitting.

4.A.(1) System Power UP

When power is first applied to the system (by rotating OFF/ON VOL Control clockwise), the active channel or frequency is displayed (systems which employ the older KTR 953 Receiver/Exciter with a crystal oven have a blank frequency display during the 2-4 minute warm up period). The active channel or frequency is the last channel or frequency used for transmit prior to system being turned off. The automatic antenna coupler is switched to the bypass state such that the receiver is connected directly to the antenna.



Depressing the microphone key button momentarily initiates the coupler’s auto tune sequence. The frequency display is blanked again during the auto tune cycle, and the TX message flashes. Emission mode and channel number continue to be displayed. Active frequency reappears upon completion of the coupler tune sequence.

4.A.(2) Channel Operation

Channel number, emission mode and active frequency are displayed. When operating in the optional A3A mode on the KCU 951 Control Unit, the AM and USB messages are both illuminated. When transmitting in the channel mode, the transmit frequency and an added TX message are displayed. Rotation of the inner control knob causes the channel to be incremented or decremented. The coupler is switched to the bypass condition when a channel change occurs. Depressing the Mic key initiates the auto tune sequence.

The coupler generates a READY signal that inhibits the auto tune sequence until a channel change occurs. The coupler monitors SWR during transmit. Should the SWR degrade to a ratio greater than 3.6:1 at the end of a transmission, the coupler starts a tune cycle synchronized with the next microphone key depression.

If a PA or coupler fault is detected, transmit is inhibited and the frequency digits flash to indicate the fault. Depressing the microphone key or a channel change clears the fault indication.

4.A.(3) Direct Frequency Mode

Operation in the direct frequency mode is similar to the channel mode except that the frequency is selected as directly rather than on a preprogrammed basis.

Frequency selection is accomplished by means of cursor/digit increment/decrement switch with only simplex operation allowed. Transmit is allowed on any 100 Hz frequency increment between 2 to 30 MHz frequency range, except for systems employing limited frequency options.

Using a KCU 951 Control Unit, the direct frequency mode is accessed when the FREQ CHAN button is in the out position. The frequency selected, emission mode selected and TX message are displayed when the KHF 950 HF/SSB system is transmitting. No channel number is displayed when operating in the direct frequency mode.



The direct frequency mode is accessed with the KFS 594 Miniature Control Unit by selecting Channel 0".

When changing from channel mode of operation to direct frequency mode of operation the control unit restores frequency and mode selections last used for transmit purposes while operating in the direct frequency mode.

The antenna coupler’s transmitter output is disengaged (bypassed) while changing between channel and direct frequency modes of operation. It is also bypassed if the selected frequency is changed. A new auto tune sequence is initiated with the microphone key.

The cursor control is the outer concentric knob for the KCU 951 Control Unit and the inner concentric knob for the KFS 594 Miniature Control Unit. Both work in an increment/decrement fashion. Cursor position is annunciated by flashing the active digit. The cursor occupies one of six positions and moves left to right for clockwise knob rotation for the KCU 951 Control Unit or by pressing the cursor knob for the KFS 594 Miniature Control Unit.

The cursor hidden position is a blank space between the least significant digit and the most significant digit. Depressing the microphone key causes the cursor to go to the hidden position.

The KCU 951 Control Unit has the capability of a borrow/carry type of tuning. This type of tuning is called rollover and is enabled in the aircraft wiring harness. This allows ease in continuous tuning up and down the frequencies (in 100 Hz steps). For example, if rollover is enabled, and two frequency digits are 89 with the cursor on the 9. One more clockwise rotation of knob changes the digits to 90. Without rollover, the digits revert to 80. If rollover is not enabled, the user may select each frequency digit individually without borrowing from or caring to the next digit.

4.B Dual System

An installation with two KHF 950 HF/SSB systems that share a common antenna is a dual system.

In a dual system both KHF 950 HF/SSB systems are allowed to receive simultaneously, but only one system is allowed to transmit at a time. An Auto Select or Manual Select scheme is employed to select the transmitting system. Auto Select systems employing KCU 951 Control Units use interlock relays to select the transmitting system. In a system with Manual Select, a pilot operated switch performs this function.



If 28 Vdc power is removed from one system the interlock causes operation to default to the other system.

5. Component Functions

5.A KCU 951 Control Unit Function

The KCU 951 controls are identified in “Figure 21 - KCU 951 Control Unit Controls” and each control function is assigned an alphabetic identifier.

Figure 21 - KCU 951 Control Unit Controls

5.A.(1) ON/OFF/VOLUME (A)

Applies power to the unit and controls the audio output level.

5.A.(2) SQUELCH (B)

Squelch control provides variable squelch threshold control.



5.A.(3) CLARIFIER (C)

Clarifier control provides up to 250 Hz of local oscillator adjustment during the receive mode of operation only. This function is performed by varying the master reference oscillator frequency. The clarifier function is disengaged by pushing the adjust knob in.

5.A.(4) MODE (D)

The emission mode switch is a momentary pushbutton that selects AME, USB or optional A3A or LSB. Emissions mode selection is cyclic moving from left to right. The switch is active at all times except transmit. A3A is indicated by displaying the AM and USB messages simultaneously.

5.A.(5) FREQ/CHAN (E)

This switch transfers the HF system from a direct frequency operation to a channelized form of operation. The switch operates as a two position switch. The depressed position establishes the channelized form of operation.

5.A.(6) CHANNEL/FREQUENCY SELECT (F)

This selector consists of two concentric knobs that control the channel and frequency digits, plus the lateral position of the cursor. These switches function as increment-decrement switches.

5.A.(7) CHANNEL CONTROL (G)

The outer knob is not functional when the FREQ/CHAN switch is in the CHAN position. The inner knob provides channel control from 1 through 99.

5.A.(8) FREQUENCY CONTROL (H)

The outer concentric knob becomes a cursor (flashing light) control with the FREQ/CHAN switch in the FREQ Position. A counter clockwise rotation of the outer knob causes the cursor to move in a right to left direction. A clockwise rotation of the outer knob causes the cursor (flashing digit) to move in a left to right direction. The flashing digit can be incremented or decremented with the inner knob. With the rollover option selected an automatic carry or borrow at 0 and 9 is applied to those digits more significant than the cursor digit. The tens megahertz digit cannot be selected. The units digit selects frequencies from 2 to 29 MHz in 1 MHz steps with rollover from 2 to 29 MHz and 29 to 2 MHz.



5.A.(9) PROGRAM (PGM) SWITCH (I)

This switch enables channelized data to be modified. The PGM message is displayed whenever this switch is depressed.

5.A.(10) STORE (STO) SWITCH (J)

This switch is used to store the displayed data when programming the preset channels.

5.B KFS 594 Miniature Control Unit Function

The KFS 594 Miniature Control Unit controls are identified in “Figure 22 - KFS 594 Miniature Control Unit Controls” and each control function is assigned an alphabetic identifier.

Figure 22 - KFS 594 Miniature Control Unit Controls

5.B.(1) ON/OFF/VOLUME CONTROL (A)

The smaller left most knob controls the ON/OFF switch and the volume of the received audio. Clockwise motion of the switch increases volume and turns the unit on.

5.B.(2) SQUELCH (B)

The large left most knob selects the threshold of the receiver signal at which the audio shall be enabled. Turn the knob clockwise to reduce this threshold.



5.B.(3) MODE (C)

The larger right most knob controls the emission mode of the radio. When LSB, USB or AM is selected, the radio is set to the corresponding mode, and the control head displays a directly selectable frequency or one of the nineteen user programmable channels. When TEL (A3J) is selected, the radio goes to the corresponding mode, and the control head displays an ITU channel.

5.B.(4) CURSOR/INC/DEC (D)

When pushed in, the smaller right most knob moves the cursor (a flashing digit) from left to right, and when rotated, serves to increment or decrement the digit selected by the cursor.

5.B.(5) STO (E)

The STO button performs four functions. First, when in the channel mode and not in program mode (program mode is annunciated by a flashing dash in the space adjacent to the channel number), pressing the STO causes the head to display the letters "TX" and the transmit frequency, while the receiver monitors the transmit frequency. This allows the user to listen for signals on the transmit frequency or a duplex channel. Second, if STO is pushed while the microphone is keyed, a 1000 Hz tone is transmitted. This is used to break the squelch of some stations. Third, pressing the STO while in program mode enters the selected frequency into the channel to be programmed. Fourth, pressing the STO clears any error conditions, which are annunciated by a flashing "E" displayed for more than three seconds.



6. System Inputs/Outputs

6.A Input/Output Signals

Table 55 describes the KHF 950 HF/SSB system input/output signals.

CONNECTOR SIGNAL NAME FUNCTION

P5941: (KA 594)

Pins 15, 40 A/C POWER A/C power input for the KA 594 Bus Adapter.

P9524: (KAC 952)

Pins N, K, C A/C POWER A/C power input for the KAC 952 Power Amplifier/Antenna Coupler.

P9531: (KTR 953

Pins 18, 34,41, 42, 44

A/C POWER A/C power input for the KTR 953 Receiver/Exciter.

P982: (KA 98)

Pin A A/C POWER A/C power input for the KA 98 Antenna.

P1585: (KA 158)

Pins A, C A/C POWER A/C power input for the KA 158 Bridging Amplifier.

P1603: (KA 160)

Pin B A/C POWER A/C power input for the KA 160 Dual Antenna Coupler.

P9511: (KCU 951)

Pin 48 MIC KEY Microphone key input to the KCU 951 Control Unit.

P9531: (KTR 953)

Pins 33, 50 MIC AUDIO Microphone audio input to the KTR 953 Receiver/Exciter.

Pin 27 MIC KEY Microphone key input to the KTR 953 Receiver/Exciter which activates the transmit function.

Pins 31, 32 DATA IN Data input to the KTR 953 Receiver/Exciter.



Table 55 - KHF 950 HF/SSB System, Inputs and Outputs

Pins 1, 23 SELCAL AF OUT

SELCAL Audio signal or DATA 2 out signal output sent to the audio panel.

Pins 12, 14 AUDIO OUT Audio signal or DATA 1 out signal output sent to the audio panel.

Pin 48 MIC KEY Microphone key input which activates the transmit function.

Pins 33, 43 AUDIO OUT Audio signal output sent to the audio panel.

P9511: (KCU 951)

Pins 34, 35, 44 LIGHTING BUS Lighting Bus for KCU 951 Control Unit.

P5941: (KFS 594)

Pins 17, 18, 19 LIGHTING BUS Lighting Bus for KFS 594 Miniature Control Unit.

CONNECTOR SIGNAL NAME FUNCTION



6.B Dual System Interlock Control Signals

Table 56 lists the typical interlock control signal voltage levels in a dual KHF 950 HF/SSB system.

Table 56 - Dual KHF 950 HF/SSB System Interlock Control Signals

MEASURED AT:RECEIVE

#1PRIMARY* #2PRIMARY*TRANSMIT

#1 KEYED #2 KEYED

P1611-C or P1621-J 28 Vdc 0 Vdc 28 Vdc 0 Vdc

#1 KA 158(J/P158S)

PIN E SELECT 1PIN F LATCH 1PIN D BUFFERED XMTPIN B PA XMTPIN A SYS #1 28 VPIN C SYS #1 GNDRF AMP STATUS

000.70.2280ON

270.70.10.2280OFF

0FLOAT2.412280OFF

2700.10.2280OFF

#2 KA 158 (J158S)

PIN E SELECT 2PIN F LATCH 2PIN D BUFFERED XMTPIN B PA XMTPIN A SYS #2 28 VPIN C SYS #2 GNDRF AMP STATUS

2800.10.2280OFF

00.80.70.15280ON

2800.70.5280OFF

0282.412280OFF

* In receive the primary system is the system that was last used to transmit.



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TESTING AND FAULT ISOLATION

1. Fault Isolation

Fault isolation locates the source of system failure at the black box or aircraft wiring level. Fault isolation is typically performed on the ground in response to failures indicated during post-installation checkout, preflight testing, or flight operation.

Perform the steps in Paragraph “2. System Performance Check” and refer to Paragraph “3. Fault Isolation Checklist” 3 for fault isolation in the KHF 950 HF/SSB system.

2. System Performance Check

The system check detects problems in the installation that may cause the HF system to fail, to degrade performance, or cause damage to the HF system, such as:

• Intermittent or improperly connected cables or connectors.• Defective units.• Poorly regulated aircraft DC power.• Poor grounding of KHF 950 HF/SSB system or poor aircraft bonding.• Audio ground loops.• RF interference.

CAUTION: POWER CARTS MAY REGULATE POORLY WHEN SUBJECTED TO STRONG RF FIELDS. IF MORE THAN 20% FLUCTUATIONS IN POWER CART VOLTAGES ARE NOTED WHEN TRANSMITTING, DO NOT CONTINUE TESTING WITH POWER CART.

CAUTION: SOME INTERMITTENT CONDITIONS MAY CAUSE OUTPUT TRANSISTORS TO FAIL, THEREFORE TRANSMIT ONLY AFTER OTHER CHECKS HAVE SUCCESSFULLY COMPLETED.

Perform the steps in the stated sequence.



2.A Preliminary Check

2.A.(1) Assure that the connector keying in the KAC 952 Power Amplifier/Antenna Coupler and control connector is correct before applying initial +28 V to system.

2.A.(2) After applying +28 V power but before attempting to transmit, flex the cable to the KAC 952 Power Amplifier/Antenna Coupler and listen for relays to chatter. Chattering relays indicate an intermittent connection. Repeat this check with the KCU 951 Control Unit or KFS 594 Miniature Control Unit. Check in each of the six bands indicated in table 1001 to be sure there are no intermittent connections in the cable. For example, this check can be performed at 3, 4, 6, 8, 12 and 19 MHz checkpoints..

Table 1001 - Transmitter Test Band

2.A.(3) As the frequency is changed on the KCU 951 Control Unit or KFS 594 Miniature Control Unit between 3, 4, 8, 12, and 19 MHz, listen to the KAC 952 Power Amplifier/Antenna Coupler. A relay click should be noted as each of the six bands is selected.

NOTE: In most installations it is beneficial to have two people conduct this test, one person to change the frequency, while the other listens to the KAC 952 Power Amplifier/Antenna Coupler.

BAND FREQUENCY RANGE CHECKPOINT

1 2.0000 to 3.0999 MHz 3 MHz

2 3.1000 to 4.8999 MHz 4 MHz

3 4.9000 to 7.5999 MHz 6 MHz

4 7.6000 to 11.8999 MHz 8 MHz

5 11.9000 to 18.0999 MHz 12 MHz

6 18.1000 to 29.9999 MHz 19 MHz



2.B Receiver Performance Check

2.B.(1) Select on the KCU 951 Control Unit or KFS 594 Miniature Control Unit, using direct frequency mode, a frequency such as 2.5, 5, 10, 15 or 20 MHz in order to receive a broadcast station of time and frequency primary standards. Your distance from the broadcast station and propagation conditions will determine which frequency will provide the best reception. (Refer to the KHF 950/990 Pilots Guide, P/N 006-18038-XXXX).

2.B.(2) Position squelch OFF (full CW) so as to not inhibit reception.

2.B.(3) If using a KCU 951 Control Unit, place clarifier in OFF position by pushing the clarifier control in.

2.B.(4) Select AM mode and wait for reference audio tone modulation from the standards station.

2.B.(5) Note the pitch of the audio tone received, then change USB mode. The pitch of the tone should not change significantly. If the tone does change, it indicates that a problem exists in the clarifier wiring or that the reference oscillator in the KTR 953 Receiver/Exciter needs alignment.

2.B.(6) If using a KCU 951 Control Unit, pull out the clarifier while on USB mode and vary clarification CW noting pitch decrease and then CCW noting pitch increase with mid range pitch about the same as with the clarifier in (OFF position). If using a KFS 594 Miniature Control Unit go to step (8).

2.B.(7) When the clarifier control is turned, the clarifier knob should have no effect on the pitch.

2.B.(8) Perform step (9) on AM mode at 3, 4, 6, 8, 12, and 19 MHz.

2.B.(9) Disconnect the coax from the KTR 953 Receiver/Exciter, turn the volume control up full on the KCU 951 Control Unit or KFS 594 Miniature Control Unit. Note that the internally generated noise is muted when the squelch control is rotated CCW 1/3 to 1/2 of its range. Adjust squelch to the verge of unsquelching, connect the coax to the KTR 953 Receiver/Exciter, and note that antenna noise pickup causes squelch breakthrough. Disconnect the coax, the squelch should mute the audio within two seconds.



NOTE: For certain times and location the antenna reception may not produce enough noise to break minimum squelch at all frequencies. A signal generator can be used to generate a test signal by connecting a length of wire to the signal generator output and setting the signal generator to about 0 dBm on the frequency of interest. Be sure the receiver is operational in all bands.

2.C Transmitter Performance Check

2.C.(1) Disconnect the coax from the KTR 953 Receiver/Exciter.

2.C.(2) Select a direct frequency mode of 8 MHz AM on the KCU 951 Control Unit or KFS 594 Miniature Control Unit.

2.C.(3) Momentarily key the mic switch.

2.C.(4) The digits should blink and the TX message should show momentarily, then a flashing fault signal should occur at 2 Hz rate indicating insufficient RF excitation to initiate the tuning routine. Momentarily key again to clear the fault.

2.C.(5) Connect the coax from the KTR 953 Receiver/Exciter to the KAC 952 Power Amplifier/Antenna Coupler.

2.C.(6) Remove the KAC 952 Power Amplifier/Antenna Coupler BNC jumper fitting which connects the transmitter output to the tuner input.

2.C.(7) Connect the TX side of SWR/wattmeter (P/N 071-05065-0000) power sensor head to the KAC 952 Power Amplifier/Antenna Coupler transmitter output. Connect the ANT side of the power sensor head to a 50 ohms resistive load of at least 50 Watts dissipation rating, such as a Bird Model 8085 with 4240-125 BNC connector. See “Figure 1001 - System Check Using SWR/Wattmeter”. Select 50 Watt range and the AVG mode on the wattmeter. Select 8 MHz AM mode on the KCU 951 Control Unit or KFS 594 Miniature Control Unit.



Figure 1001 - System Check Using SWR/Wattmeter

2.C.(8) Momentarily key the mic switch. While tuning, the power should be between 5 and 10 watts. Tuning should complete in about four seconds showing 1:1 SWR during and after tune. Power after tune should be 37.5 watts if 28 Vdc supply voltage is maintained at the KAC 952 Power Amplifier/Antenna Coupler connector during transmit. The power output will be reduced to as low as 70% if supply voltage to the KAC 952 Power Amplifier/Antenna Coupler connector drops to 22 V under load due to battery or wiring limitations. This power reduction is intentionally designed into the ALC to prevent transmitter distortion with a very low battery voltage.

NOTE: If the meter indicates more than 10w during tune, it indicates the ALC is not working properly. Terminate the test to prevent damage to power transistor. Do not hold the MIC button down during tune. Simply push the MIC button momentarily to initiate the tune.

2.C.(9) Select 9 MHz AM on the KCU 951 Control Unit or KFS 594 Miniature Control Unit. Remove the 50 ohm transmitter load from the ANT side of the SWR/wattmeter. Key the mic switch and time the tuning. The tune power should still be 5 to 10 Watts but with infinite SWR. If using a KCU 951 Control Unit or KFS 594 Miniature Control Unit, clear the fault with another momentary mic key. Since the tune is never completed, the transmitter never goes to high power. This is safe since the tuning power is limited to 5 to 10 Watts during tune.



2.C.(10) Connect the SWR/wattmeter (P/N 071-05065-0000) sensor head between the transmitter output and the tuner input on the KAC 952 Power Amplifier/Antenna Couple using only the fittings on the sensor.

NOTE: If a wattmeter other than P/N 071-05065-0000 is used which does not attach directly to the KAC 952 Power Amplifier/Antenna Coupler, it is necessary to tune the system first with the double elbow BNC connector in place. After the KAC 952 Power Amplifier/Antenna Coupler is tuned, the BNC connector may be removed and the wattmeter may be attached via short cables and readings taken. Tuning the system with a different wattmeter in place will result in erroneous readings due to capacitance in the additional cable.

2.C.(11) Tune the antenna on the authorized frequencies while monitoring the SWR indication during and after the tune on AM mode. You should see the SWR reduced as the tune progresses with the end of the tune resulting in a 2.5:1 or lower.

NOTE: If a wattmeter other than P/N 071-05065-0000 is used, you will not be able to monitor the SWR during the tune.

2.C.(12) Change to USB mode on the KCU 951 Control Unit or KFS 594 Miniature Control Unit. Select the peak reading mode on the power meter. At most mid-range frequencies during transmit, modulation should show 150 Watt PEP into a low SWR tune if 28 Vdc is maintained at the KAC 952 Power Amplifier/Antenna Coupler connector. For 2.5:1 SWR tune or at the 2 or 30 MHz limits, expect 10% variation from 150 W and up, to an additional 25% variation may be noted if using a wattmeter other than P/N 071-05065-0000.

2.C.(13) For AM mode operation the transmitter will maintain 37.5 Watts only until heat sink temperature rises above 120° C, then power output is automatically regulated downward to protect the power amplifier transistors from becoming to hot. Operation in the USB or LSB modes is more efficient than AM mode. As a result, the temperature of the heat sink will generally not exceed 120° C in SSB voice communications. The 120° C may be exceeded if transmitting data, or with high altitude operation, resulting in a reduction in transmitter output power.

2.C.(14) The antenna coupler should either tune the antenna or display a fault in less than 45 seconds. A fault is displayed on a KCU 951 Control Unit or KFS 594 Miniature Control Unit as flashing frequency digits. Failure to do so indicates an interconnect or unit problem. A failure of the antenna coupler to find a tune can indicate an antenna, antenna feedline, grounding, or KAC 952 Power Amplifier/Antenna Coupler failure.



2.C.(15) Once the antenna coupler is tuned, when using a KCU 951 Control Unit or KFS 594 Miniature Control Unit, it should not have to retune until the frequency is changed or DC power to the HF is interrupted. When using a KFS 594 Miniature Control Unit, changing the mode will have the same effect as changing frequency and cause the system to retune on the next transmission. Once a channel is tuned it should not have to retune until the frequency is changed. Retuning without changing frequency indicates poor connections to the antenna, poor grounding, or poor DC power regulation.

2.C.(16) Select an authorized frequency on the KCU 951 Control Unit or KFS 594 Miniature Control Unit. In the AM mode, key the microphone with no modulation (holding your hand over the mic element may be helpful). Listen for a tone or squeal in the sidetone. If a tone or squeal is heard, it indicates audio (microphone ground loop) or RF feedback problems are present.

2.C.(17) As a final check, establish communication with another HF station and request a signal/audio quality report.

3. Fault Isolation Checklist

FAULT CAUSES

Synthesizer Fault:

The KCU 951 or KFS 594 display is blank except for a decimal point. That indicates the synthesizer is in fault condition, or the channeling is missing.

1. The serial data from the control unit KCU 951 or KA 594/KFS 594 to the KTR 953 is bad. That causes the synthesizer to be unlocked.

2. The internal oscillator in the KTR 953 is bad and the synthesizer unlocks.

Tuning Fault:

The frequency display immediately starts to flash in less than a couple seconds after an attempt to tune the system.

1. There is no excitation from the KTR 953 to the KAC 952. Check for a bad coax between the units.

2. In a dual system the coaxes between the KA 158 Bridging Amplifiers may be crossed. The top connector on one should connect to the bottom connector on the other.

3. The band bit lines between the controller and the KAC 952 may be bad.



Tuning Fault:

The system display starts flashing 5 to 45 seconds after an attempt to tune the system.

1. If the problem is limited to small bands of frequencies, it may be poor grounding of the KAC 952 or a fault in the KAC 952.

2. If it takes a long time to tune, but eventually does tune most frequency bands, a short may exit in the KA 160, KA 161, or KA 162. If the output stud is over-tightened the internal RF feed straps may twist and short. Remove the side cover of the KA 160, KA 161, or KA 162 to check for shorted straps.

3. The output of the KAC 952 may be open. Check coaxes to the antenna system.

FAULT ISOLATION STEPS:

1. Pull the power connector from the KAC 952. Jumper the harness connector pins M, U, V together and let the connector hang loose. With the connector pulled and those pins shorted together the KTR 953 and the controller thinks the couple is valid and ready. This checks the system without the coupler.

2. Try to tune the system. It should find a tune in less than a couple seconds. If if still faults, the KAC 952 and antenna system are ruled out as the cause.

E 001 and/or E 008 on KCU 951 Display:

A communication problem exists between the KCU 951 and KTR 953. It could be a serial data wiring problem, or a fault in the KCU 951 or KTR 953 units.

FAULT CAUSES



Poor Transmit/Receive Range: HF frequency selection is critical for particular atmospheric conditions. The distance HF can communicate is limited to a minimum and maximum by the time of day, season of the year, and recurring atmospheric conditions including sunspot cycles. Refer to the KHF 950 Pilots Guide, Section I for appropriate frequencies for time of day, time of year, and range in miles.

Transmission Weak and Unreadable: Excessive microphone noise can create a peak RF output without any voice modulation. Voice modulation is buried in noise modulation. The HF should output very little power until the microphone audio is applied to the modulator. But circulating currents in the mic audio shields can cause mic audio noise that modulates the transmitter. If the peak output power, without voice modulation, climbs to the 50 to 150 watt range, too much noise is on the mic audio. An unmodulated HF output should be below 20 watts. The audio shielding should be grounded at one end only to prevent current flow in the shield.

Unable to establish transmit or receive HF communications. Numerous frequencies and stations attempted:

May have same cause as transmission weak and unreadable. If the microphone noise gets loud enough, voice modulation will not be recognized and an answer will never be received.

Excessive Power: 1. Grounded or reversed ALC lines from KAC 952 to KTR 953 can cause excessive power. It causes the exciter to drive the power amplifier to maximum output and usually blows the transmitter final amplifiers.

2. A mismatch of the KTR 953 and KAC 952 can cause excessive power. If the KTR 953 has Mod 8, the KAC 952 needs to have Mod 10 and vice versa. The tuning power may be too high or too low.

FAULT CAUSES



Table 1002 - Fault Isolation Checklist

HF has weak Receive and Transmit: If the HF output is shorted inside the KA 160, KA 161, or KA 162 the transmitter may still be able to tune the frequency, but the range will be greatly reduced. Inside the KA 160, KA 161, or KA 162 are metal feed strips that can be twisted out of place if the nut on the output is over-tightened. Pull the side cover to check for a twisted strap shorted to ground.

Controller locks up when pilot’s mike is keyed. Frequency does not show in window.

If the frequency disappears and the “TX” remains it means the KAC 952 is in TUNE Mode. If it stays in TUNE Mode indefinitely it means the KAC 952 received a PA Tune command but did not receive a PA TX command.

The system goes into retune when attempting to transmit:

An intermittent connection between the KAC 952 and the antenna can cause arcing, especially at altitude. Check the coax connections for proper fit and the coax for integrity.

The SELCAL does not work in a KHF 950 HF/SSB ALE system:

The system must be in MANUAL mode for SELCAL to work in an ALE system. SELCAL will not work in ALE mode because the system is scanning, interrogating, and switching frequencies.

FAULT CAUSES



INSTALLATION AND MAINTENANCE

1. General Coverage

This section provides service personnel with installation and maintenance information pertaining to the following KHF 950 HF/SSB Communication System components:

• KCU 951 Control Unit• KFS 594 Miniature Control Unit• KA 594 Bus Adapter• KAC 952 Power Amplifier/Antenna Coupler• KTR 953 Receiver/Exciter• KA 98 Antenna• KA 161 External Capacitor• KA 158 Bridging Amplifier• KA 160 Dual Antenna Adapter• KA 162 Dual External Capacitor

2. Unpacking

Use care when unpacking KHF 950 HF/SSB system components. Open shipping cartons and carefully remove all items. Check that all items on the packing list are included. Visually inspect each component for damage incurred during shipment: dents, deep abrasions, chipped paint, etc. If any component is damaged, notify the transportation carrier immediately.

3. Pre-installation Testing

All components of the KHF 950 HF/SSB system have been adjusted and tested before shipment and pre-installation testing is not required. If pre-installation bench testing of any unit is desired, refer to the bench test section of the applicable maintenance manual. Refer to Paragraph “1.F Related Publications” for list of related maintenance manuals.

4. Equipment Changes and Markings

A standardized marking system identifies equipment with incorporated modifications. Refer to the Publications Index for a list of Service Bulletins affecting the various units in the KHF 950 HF/SSB system.



5. Installation Planning

5.A General Considerations

General information for installation of the KHF 950 HF/SSB system, instructions for location of system components, interwiring and cable fabrication, and mode strapping options are provided in the following paragraphs. Interconnect diagrams at the end of this section show the interconnection of various system components.

The KHF 950 HF/SSB system should be installed in the aircraft in a manner consistent with acceptable workmanship and engineering practices and according to instructions set forth in this publication.

The installer should make a thorough visual inspection and perform the post-installation and operational checks of the system to ensure that the system has been properly and safely installed in the aircraft.

CAUTION: AFTER INSTALLATION OF THE CABLING AND BEFORE INSTALLATION OF THE EQUIPMENT, SUPPLY AIRCRAFT PRIMARY POWER TO THE UNIT CONNECTORS AND CHECK THAT POWER IS APPLIED ONLY TO THE PINS SPECIFIED IN THE INTERWIRING DIAGRAMS.

5.B Location of Equipment

5.B.(1) KCU 951 Control Unit Mounting Location

Refer to “Figure 2028 - KCU 951 Control Unit Outline and Mounting Drawing” for mounting dimensions.

The KCU 951 Control Unit is mounted within easy reach of the flight crew in standard aircraft Dzus rails. If the aircraft is not equipped with Dzus fittings, refer to “Figure 2028 - KCU 951 Control Unit Outline and Mounting Drawing” for mounting dimensions and to Paragraph “1.C Component Installation Kits Supplied” for part numbers of Dzus rails. Dzus rails are not supplied with KHF 950 HF/SSB system, but may be ordered separately.

5.B.(2) KFS 594 Miniature Control Unit Mounting Location

Refer to “Figure 2029 - KFS 594 Outline and Mounting Drawing” and KFS 594 Installation/Maintenance Manual P/N 006-05575-XXXX.



5.B.(3) KA 594 Bus Adapter Mounting Location

Refer to “Figure 2030 - KA 594 Outline and Mounting Drawing” and KA 594 Installation/Maintenance Manual P/N 006-05543-XXXX.

5.B.(4) KAC 952 Power Amplifier/Antenna Coupler Mounting Location

The KAC 952 Power Amplifier/Antenna Coupler should be located as close as possible to the antenna feed. The ideal distance is less than 6 inches (15.25 cm.). A length of 18 inches (45.7 cm) is the absolute maximum.

Note: The lead from the coupler to the antenna becomes a part of the antenna and will radiate RF energy inside the fuselage, which may cause interference with other equipment. Antenna feedlines longer than 6 inches will reduce the efficiency of the KAC 952 Power Amplifier/Antenna Coupler and introduce the possibility of failure to tune at some frequencies. The coupler is equipped with a coaxial output connector, and this feedline must be shielded by using RG-393 cable or an equivalent high voltage cable. The coaxial feedline must be kept as short as possible to reduce losses.

The KAC 952 Power Amplifier/Antenna Coupler should be mounted to a rigid structure, e.g. the avionics shelf or aircraft floor. Do not locate the unit on the aircraft skin. Refer to “Figure 2001 - KAC 952 Installation Considerations”, “Figure 2027 - KAC 952 Grounding Detail”, and “Figure 2031 - KAC 952 Outline and Mounting Drawing” for additional mounting considerations.

Figure 2001 - KAC 952 Installation Considerations(Sheet 1 of 2)



Figure 2001 - KAC 952 Installation Considerations(Sheet 2 of 2)



5.B.(5) KTR 953 Receiver/Exciter Mounting Location

The unit should be mounted to a rigid structure, e.g. avionics shelf or aircraft floor. Do not locate the unit on the aircraft skin. Allow one inch of free air space around the top and sides of the unit. If the KTR 953 Receiver Exciter is mounted at the side of the KAC 952 Power Amplifier/Antenna Coupler do not install adjacent to the heat sink of the KAC 952 Power Amplifier/Antenna Coupler. Refer to “Figure 2032 - KTR 953 Outline and Mounting Drawing” for mounting dimensions.

5.B.(6) Antenna Location

The antenna is a primary factor for maximum performance of the KHF 950 HF/SSB system. While numerous options are available in the choice of antenna configurations, some configurations are better suited for a particular installation than others. Commonly used aircraft HF antenna will generally fall into one of four categories:

• V (Referring to the V shape formed by the antenna wire) and Long wire antenna.

• Short grounded wire antenna.• Shunt antenna.• Probe antenna.

Characteristics of these commonly used antennas and the compromise associated with each type are described below, so the installer can select the antenna that is best suited to a particular aircraft and type of operation. All antennas should be installed in a manner that does not jeopardize the safe operation of the aircraft.

5.B.(7)(a) V and Long Wire Antenna Mounting Location

Because of their generally good performance, consideration should be given to the use of V and long wire antennas on all installations, except very high speed fixed wing aircraft and helicopters. Wire antennas are not recommended for use on helicopter due to safety concerns in the event of an antenna wire breakage.



V and long wire antenna performance will be enhanced by striving to meet the following criteria:

• Maximize the length of wire (up to approximately 60 ft. or 18 m.). The total length of the antenna should be at least 25 ft. (7.6 m).

• Maximize the separation between the antenna wire and the aircraft structure. This is usually achieved by attaching the tensioner as high as possible on vertical stabilizers.

• The far end of the antenna should be either grounded or left open in accordance with the criteria in “Table 2001 - “V” and Long Wire Antenna Termination Considerations”.

Table 2001 - “V” and Long Wire Antenna Termination Considerations

ANTENNA LENGTH TERMINATION

25 ft. (7.6 m) or less Grounded

Between 25ft (7.6m) and 30ft (9.2m) May be either open or grounded

Longer than 30 ft. (9.2 m) Open

NOTE: Ungrounded (Open) antennas develop high RF voltages and therefore are not suitable for operation above 30,000 ft. unless the KAC 952 Power Amplifier/Antenna Coupler is mounted in a pressurized area.



5.B.(7)(a)1 Wing Tip V Antenna Mounting Location

The wing type V is one of the most effective HF antennas which can be utilized on an aircraft. It is well suited for slow and moderate speed aircraft which require optimum HF communications performance. It will exhibit a rather omnidirectional radiation pattern, and provide good efficiency at all frequencies. It has the disadvantages of having high drag, and on low wing aircraft is prone to being walked into. The length of a wing tip “V” antenna is usually 30 to 45 ft. (9.2 to 13.7 m).

Figure 2002 -Typical Wing Tip “V” Antenna



5.B.(7)(a)2 Inverted V Antenna Mounting Location

The inverted V antenna is recommended when a wing V is not practical and the antenna coupler is to be mounted in the aft position of the aircraft. The inverted V antenna will produce maximum signal strength off the side of the aircraft, and provide good efficiency at most frequencies. This antenna will produce a moderate amount of drag.

The vertical fin anchor should be located as high as possible on the vertical stabilizer. The feedthru insulator should be located approximately 3 ft. (0.9 m) forward of the base of the vertical stabilizers and near the centerline of the top of the aircraft.

Figure 2003 - Typical Inverted “V” Antenna



5.B.(7)(b) Long Wire Antenna Mounting Location

The long wire antenna is used when the KA 952 Power Amplifier/Antenna Coupler is located in the forward part of the aircraft. It will provide maximum signal radiation off the sides of the aircraft, and exhibit good efficiency, even at the lower frequencies. Significant nulls in signal strength may be noted off the nose and tail of the aircraft.

Figure 2004 - Typical Long Wire Antenna

5.B.(7)(c) Short Grounded Wire Antenna Mounting Location

Short grounded wire antennas may be utilized on higher speed and/or high altitude aircraft. These short wire antennas have a minimum drag. and do not develop as high of RF voltages as do the longer wire antennas, making them suitable for operations up to 55,000 ft. However the efficiency of the short antenna will be lower, especially at the low frequencies.

Typical short wire antennas lengths from around 8 ft. (2.4 m) to 18 ft. (5.5 m). Grounded wire antennas less than 10 ft. (3 m) long must use a KA 161 External Capacitor or KA 162 Dual External Capacitor with -02, -12 versions of the KAC 952 Power Amplifier/Antenna Coupler. Also, the large antenna currents require the use of a wire with low RF resistance (i.e., large diameter and highly conductive surface) to reduce the power losses in the wire. The feedline and the antenna grounding must have very low RF resistance. Only tensioner with an attached ground wire should be used to terminate the antenna.



5.B.(7)(c)1 Short Wire to Vertical Stabilizer Antenna Mounting Location

The most common form of short grounded wire antennas have the feedthru insulator mounted on the upper aft part of the fuselage, as far forward of the vertical stabilizer as practical. The antenna wire runs from this feedthru to the tip of the vertical stabilizer. It is important to ground this wire as high as possible on the vertical stabilizer to maximize the efficiency and to reduce the nulls in the pattern. This antenna will generally exhibit maximum radiation off the side of the aircraft.

Figure 2005 - Typical Short Wire to Vertical Stabilizer Antenna

5.B.(7)(c)2 Short Wire to Wing or Horizontal Stabilizer Antenna Mounting Location

In installations where the short wire to the vertical stabilizer may not be practical, consideration may be given to a short grounded wire to the wing or horizontal stabilizer. While such antennas produce only minimum drag, they will tend to be directional off the side of the aircraft. These antennas are also prone to being walked into. Maximum separation between the wire and the aircraft structure is important, as is maximizing the length of the wire.



Figure 2006 - Typical Short Wire to Wing Antenna

Figure 2007 - Typical Short Wire to Horizontal Stabilizer Antenna

5.B.(7)(d) Shunt Antenna Mounting Location

Two types of shunt antennas are commonly used. The most preferable type, on a fixed wing aircraft, is designed by the airframe manufacturer as a part of the airframe structure. It is most often an electrically isolated section of the leading edge of the vertical stabilizer, grounded at the top. The other type of shunt antenna is often referred to as a tranline or towel bar, which is simply a rod or tube run external to a section of the airframe and grounded.



Shunt antennas are suitable for high altitude aircraft because they do not develop extremely high voltage, however they do develop extremely high RF currents (up to 50 amps). In order to accommodate these high currents, all shunt antennas require the use of a KA 161 External Capacitor or KA 162 Dual External Capacitor with -02, -12 versions of the KAC 952 Power Amplifier/Antenna Coupler.

5.B.(7)(d)1 Leading Edge of Vertical Stabilizer Antenna Mounting Location

A shunt antenna that is built into the leading edge of the vertical stabilizers has become popular on many jet aircraft. Such an antenna provides no drag, exhibits a rather omnidirectional radiation pattern, and if well bonded can provide moderate to good efficiencies. Good bonding of the antenna, KAC 952 Power Amplifier/Antenna Coupler, and KA 161 External Capacitor or KA 162 Dual External Capacitor is essential. A large diameter feedline exhibiting extremely low RF resistance must be used between the KA 161 External Capacitor/KA 162 Dual External Capacitor and the antenna.

Figure 2008 - Typical Shunt Leading Edge Antenna



5.B.(7)(d)2 Shorted Tranline or Towel Bar Antenna Mounting Location

Grounded tranline (transmission line), often referred to as towel bar antennas because their shape resembles a towel bar, are best suited for helicopter applications. They can be attached parallel to the tailboom, and fed on the forward end. These antennas should be used on fixed wing aircraft only if no other options are practical. These antennas provide minimum drag, but suffer from poor efficiencies, especially at the low frequencies. Loss with this type of antenna can be minimized by observing the following criteria:

• Space the antenna as far off the airframe as possible, 18 in (0.46 m) is preferred, with spacing of less than 9 in (23 cm) being unacceptable.

• The antenna diameter should be a minimum of 1 in (2.54 cm), and constructed out of a highly conductive material. Copper or aluminum is generally used, with silver plating being recommended. Stainless steel should be avoided due to its high resistance. This antenna should be a continuous piece (non-spliced), and well bonded at both ends.

• A minimum antenna length of 12 ft. (3.7 cm) should be used. The feedline coax length should be limited to 6 in (15 cm).

• It is preferable to attach the antenna to a protruding surface, such as a tail boom or a stabilizer element. Attaching to a wide section of the fuselage will generally provide poor performance.

Figure 2009 - Typical Shorted Tranline or Towel Bar Antenna



5.B.(7)(e) Probe Antenna Mounting Location

The KA 98 antenna can be used in applications where longer antennas are not practical. Like all short antennas, a probe antenna will provide poor efficiencies at the very low frequencies. Maximum signal strength will generally be produced off the side of the of the aircraft. Drag will be minimum.

On a helicopter, the best performance is obtained with the antenna mounted forward. If aft mounted, a minimum of 3 ft. (0.9 m) separation is required between the antenna probe and conductive air frame structure. On a fixed wing aircraft aft mounting is recommended, with the probe being free and clear of the airframe. It is important that the probe antenna be provided with a good RF ground. The feedline between the KAC 952 Power Amplifier/Antenna Coupler and the KA 98 Antenna may not exceed 18 in (0.46 m). If the 18 inch requirement cannot be met in a particular installation, consideration should be given to the use of a KHF 990 system.

Figure 2010 - Typical KA 98 HF Antenna



5.C Interwiring and Cable Fabrication

5.C.(1) Fabrication and Routing

“Figure 2045 - KHF 950 KCU 951) Interconnect Drawing” and “Figure 2046 - KHF 950 12 Vdc to 28 Vdc Conversion” provide interconnect summaries of the KHF 950 HF/SSB Communication System (with KCU 951).

Cabling must be fabricated according to the interwiring diagrams. The length of the wires to parallel pins should be approximately the same length, for best current distribution. Wires for optional functions are shown on the interwiring diagrams. The actual use of these wires will depend upon the installation, customer requirements and capability of the units installed.

When the cables are installed in the aircraft, they must be supported firmly enough to prevent movement and should be carefully protected against chafing. Additional protection should also be provided in all locations where the cables may be subject to abuse.

In wire bundles, the cabling should not be tied tightly together as this tends to increase the possibility of noise pickup and similar interference. When routing cables through the airframe, the cables should cross high-level lines at a right angle.

Wiring harness and antenna cable should be routed in such a manner that they do not adversely affect the operation of the shock mounts.

The installer must be knowledgeable of any system variation peculiar to the installation such as strapping requirements described in Paragraph “5.D Strapping Options”. Furthermore, the installer should use ARINC Characteristic 735 as a guide and reference throughout the fabrication and installation of the cabling in the aircraft.

5.C.(2) Interface Capability and Requirements

All RF coaxes must be double shielded.

In systems that employ speech processing (i.e., KTR 953 Receiver/Exciter -10, -11), special care should be taken in the routing of the microphone input line. This line is susceptible to noise. It should not be routed in the same harness containing high current lines, such as the DC Power to the KAC 952 Power Amplifier/Antenna Coupler.



5.C.(3) Primary Power and Circuit Breaker Requirements

The KAC 952 Power Amplifier/Antenna Coupler must be connected to the aircraft power with a circuit breaker with not less than a 25 AMP rating. A fuse block and fuse should be installed to protect the individual units of the KHF 950 HF/SSB system.

A special fuse block (P/N 071-00029-0000) is required in systems that employ speech process (i.e., KTR 953 Receiver/Exciter -10, -11). This fused block contains filtering capacitors to reduce potential interference and must be installed near the KAC 952 Power Amplifier/Antenna Coupler.

5.C.(4) Antenna Cable Type

The antenna cable must be double shielded and not adversely affect the operations of the shock mounts. RG-393 (P/N 024-0005-0060) or equivalent is recommended for fabrication of the antenna cable.

5.C.(5) Connectors

Mating connectors for the KHF 950 HF/SSB system components are identified on the appropriate outline drawing. Associated connector installation kits are specified in “Description and Operation”. Crimping, insertion, extraction tools are identified in Paragraph “5.C.(6) Crimping, Insertion and Extraction Tools”.



5.C.(5)(a) KCU 951 Control Unit Connector

Figure 2011 - KCU 951 Control Unit Connector (J9511) Pin Configuration

PIN SIGNAL NAME I/O DESCRIPTION

1 A3A ENABLE IN CONFIGURATION STRAP

2 RX XMT OUT OUTPUT SIGNAL (CONTROL SIGNAL SELECTING RX OR XMT MODE OF OPERATION FOR RECEIVER OPERATIONS).

3 RX BB1 OUT OUTPUT SIGNAL (BIT 1 OF RECEIVER BAND DATA. BIT 1 CONTROLS THE ACTIVE STATUS OF UNIT # 2 IN A DUAL SYSTEM).

4 RX BB0 OUT OUTPUT SIGNAL (BIT 0 BCD OR RECEIVER BAND DATA. BIT 0 CONTROLS THE ACTIVE STATUS OF UNIT # 1 IN A DUAL SYSTEM).

5 ON/OFF OUT OUTPUT SIGNAL (CONTROL SIGNAL TO TURN SYSTEM ON OR OFF).

6 CLARIFIER CCW OUT OUTPUT SIGNAL (CONTROL SIGNAL REQUESTING CLARIFIER CIRCUITS TO DECREASE LOCAL OSCILLATOR FREQUENCY).

7 CLARIFIER ARM OUT OUTPUT SIGNAL (CONTROL SIGNAL TO ACTIVATE OR DEACTIVATE CLARIFIER CIRCUITS).



8 CLARIFIER CW OUT OUTPUT SIGNAL (CONTROL SIGNAL REQUESTING CLARIFIER CIRCUITS TO INCREASE LOCAL OSCILLATOR FREQUENCY).

9 LSB ENABLE IN CONFIGURATION STRAP

10 A3A OUT OUTPUT SIGNAL (CONTROL SIGNAL TO ACTIVATE OR DEACTIVATE A3A EMISSION MODE).

11 SYN CLK OUT OUTPUT SIGNAL (CLOCK SIGNAL FOR SYNTHESIZER TUNING SERIAL DATA BUS).

12 SYN DATA OUT OUTPUT SIGNAL (DATA SIGNAL FOR SYNTHESIZER TUNING SERIAL DATA BUS).

13 PA BB2 OUT OUTPUT SIGNAL (BIT 2 OF PA BCD BAND SELECT DATA).

14 POLARIZER PIN - GUIDE PIN

15 CPLR FAULT IN INPUT SIGNAL (COUPLER FAULT STATUS SIGNAL).

16 CPLR BYPASS OUT OUTPUT SIGNAL (CONTROL SIGNAL ENABLING OR DISABLING COUPLER CIRCUITS).

17 CPLR RDY IN INPUT SIGNAL (COUPLER READY STATUS SIGNAL).

18 NO CONNECTION -

19 SQUELCH OUT OUTPUT SIGNAL (SQUELCH CONTROL SIGNAL).

20 VOL & SQUELCH REF OUT OUTPUT SIGNAL (COMMON FOR THE VOLUME AND SQUELCH CONTROL SIGNALS).






23 VOL SHIELD IN INPUT GROUND

24 NO CONNECTION -

25 ROLLOVER ENABLE IN CONFIGURATION STRAP

26 A/C IN INPUT GROUND

27 CLK SHIELD IN INPUT GROUND

28 DATA SHIELD IN INPUT GROUND

29 STROBE SHIELD IN INPUT GROUND

30 SYN STROBE OUT OUTPUT SIGNAL (STROBE SIGNAL FOR SYNTHESIZER TUNING SERIAL DATA BUS).

31 RX BB2 OUT OUTPUT SIGNAL (BIT 2 OF BCD RECEIVER BAND DATA).

32 RX TUNE OUT OUTPUT SIGNAL (CONTROL SIGNAL REQUESTING A RECEIVER TUNING SEQUENCE).

33 PWR ON RESET IN INPUT SIGNAL (CONTROL SIGNAL ALLOWING A POWER ON SYSTEM RESET).

34 28 V LIGHTING HI IN INPUT SIGNAL (28 V INPUT FOR 28 V LIGHTING BUS).


36 PA XMT OUT OUTPUT SIGNAL (CONTROL SIGNAL SELECTING RX OR XMT MODE OF OPERATION FOR TRANSMITTER OPERATIONS).

37 VOL VAR OUT OUTPUT SIGNAL (VOLUME CONTROL SIGNAL).

38 +12 V IN INPUT POWER (+12 V)





Table 2002 - KCU 951 Control Unit Connector (J9511) Pin Name Definitions

40 PA LOGIC REF IN INPUT SIGNAL (COMMON FOR PA LOGIC SIGNALS).

41 LOGIC REF IN INPUT SIGNAL (COMMON FOR LOGIC SIGNALS).

42 RX AM OUT OUTPUT SIGNAL (CONTROL SIGNAL SELECTING AM MODE OF OPERATION FOR RECEIVER OPERATIONS).

43 CLARIFIER ON/OFF OUT OUTPUT SIGNAL (CONTROL SIGNAL ENABLING OR DISABLING CLARIFIER CIRCUITS).

44 LIGHTING LO IN INPUT SIGNAL (COMMON FOR LIGHTING BUS).

45 CHASSIS GND IN INPUT GROUND


47 OVEN & SYN RDY IN INPUT SIGNAL (SYN STATUS)

48 MIC KEY IN INPUT SIGNAL (MIC KEY STATUS SIGNAL)

49 -26 V IN INPUT POWER (-26 V)

50 PA TUNE OUT OUTPUT SIGNAL (CONTROL SIGNAL REQUESTING A PA TUNING SEQUENCE).




5.C.(5)(b) KFS 594 Miniature Control Unit Connector

Figure 2012 - KFS 594 Miniature Control Unit Connector (J5941)Pin Configuration


1 AGC IN INPUT SIGNAL (AUTO GAIN CONTROL FOR DATA INPUT SIGNAL).

2 AUDIO OUT OUT OUTPUT SIGNAL (SYSTEM AUDIO OUTPUT).

3 AUDIO LO OUT OUTPUT SIGNAL (SYSTEM AUDIO OUTPUT).

4 MIC RTN OUT OUTPUT SIGNAL (MIC AUDIO OUTPUT).

5 MIC OUT OUT OUTPUT SIGNAL (MIC AUDIO OUTPUT).

6 MIC IN IN INPUT SIGNAL (MIC AUDIO INPUT).

7 LINK DATA IN INPUT SIGNAL (SERIAL DATA SIGNAL RECEIVED FROM THE KA 594 BUS ADAPTER).

8 RTN DATA OUT OUTPUT SIGNAL (SERIAL DATA RETURN TO THE KA 594 FROM THE KFS 594).

9 ON/OFF OUT OUTPUT SIGNAL (CONTROL SIG-NAL TO TURN SYSTEM ON OR OFF).




Table 2003 - KFS 594 Miniature Control Unit Connector (J5941)Pin Name Definitions

11 LINK CLOCK IN INPUT SIGNAL (SERIAL DATA SIGNAL RECEIVED FROM THE KA 594 BUS ADAPTER).

12 PTT IN INPUT SIGNAL (CONTROL SIGNAL REQUESTING TRANSMITTER TO BE ACTIVATED).

13 NO CONNECTION -

14 NO CONNECTION -

15 +12 V IN INPUT SIGNAL (POWER +12 V)

16 +5 V IN INPUT SIGNAL (POWER +5 V)



19 LO LIGHTING IN INPUT SIGNAL (LIGHTING BUS COMMON).

20 KEY - CONNECTOR KEY

21 NO CONNECTION -

22 NO CONNECTION -

23 RX AUDIO IN IN INPUT SIGNAL (REC AUDIO)

24 GND IN INPUT GROUND


26 SIG REF IN INPUT GROUND

27 SIG REF IN INPUT GROUND

28 RESET IN INPUT SIGNAL (CONTROL SIGNAL ALLOWING A POWER ON SYSTEM RESET).

29 A/C POWER IN INPUT POWER (+28 V)




5.C.(5)(c) KA 594 Bus Adapter Connectors

5.C.(5)(c)1 KA 594 Bus Adapter Connector (P5941)

Figure 2013 - KA 594 Bus Adapter Connector (P5941) Pin Configuration


1 A3H OUT OUTPUT SIGNAL (CONTROL SIGNAL ACTIVATING OR DEACTIVATING A3A EMISSION MODE).

2 RX TUNE OUT OUTPUT SIGNAL (CONTROL SIGNAL REQUESTING A RECEIVER TUNING SEQUENCE).

3 RESET IN INPUT SIGNAL (CONTROL SIGNAL ALLOWING A POWER ON SYSTEM RESET).

4 PA TUNE OUT OUTPUT SIGNAL (CONTROL SIGNAL REQUESTING A POWER AMPLIFIER TUNING SEQUENCE).

5 RX BB1 OUT OUTPUT SIGNAL (BIT 1 OF BCD BAND DATA RECEIVER OUTPUT PORT. BIT 1 CONTROLS THE ACTIVE STATUS OF UNIT #2).


7 AUDIO RTN SHIELDS IN INPUT GROUND



8 RX BB0 OUT OUTPUT SIGNAL (BIT 0 OF RECEIVER BCD BAND DATA RECEIVER. BIT 0 CONTROLS THE ACTIVE STATUS OF UNIT #1).


10 VOLUME OUT OUTPUT SIGNAL (CONTROL SIGNAL FOR VOLUME OF SYSTEM AUDIO OUTPUT).

11 OVEN & SYN RDY IN INPUT SIGNAL (STATUS SIGNAL INDICATING SYN RDY STATUS)

12 PA BB2 OUT OUTPUT SIGNAL (BIT 2 OF PA BCD BAND SELECT DATA)

13 -26 V IN INPUT POWER (-26 V)

14 LSB IN CONFIGURATION STRAP


16 BYPASS OUT OUTPUT SIGNAL (CONTROL SIGNAL ENABLING OR DISABLING COUPLER CIRCUITS).

17 A3A OUT OUTPUT SIGNAL (CONTROL SIGNAL ACTIVATING OR DEACTIVATING A3A EMISSION MODE).

18 AUDIO IN INPUT SIGNAL (REC AUDIO SIGNAL).

19 RXTX OUT OUTPUT SIGNAL (CONTROL SIGNAL SELECTING RX OR XMT MODE OF OPERATION FOR RECEIVER OPERATIONS).

20 PA TX OUT OUTPUT SIGNAL (CONTROL SIGNAL TO SELECTING RX OR XMT MODE OF OPERATION FOR POWER AMPLIFIER OPERATIONS).

21 RX BB2 OUT OUTPUT SIGNAL (BIT 2 OF RECEIVER BCD BAND DATA).




22 NO CONNECTION -

23 DATA SHIELD IN INPUT GROUND

24 CLOCK SHIELD IN INPUT GROUND

25 STROBE SHIELD IN INPUT GROUND

26 VOLUME SHIELD IN INPUT GROUND

27 CHASSIS GROUND - CHASSIS GROUND

28 N/A - -


30 SQUELCH OUT OUTPUT SIGNAL (SQUELCH CONTROL SIGNAL).

31 AUDIO GND IN INPUT GROUND

32 STROBE OUT OUTPUT SIGNAL (STROBE SIGNAL FOR SYNTHESIZER TUNING SERIAL DATA BUS).

33 DATA OUT OUTPUT SIGNAL (DATA SIGNAL FOR SYNTHESIZER TUNING SERIAL DATA BUS).

34 AGC IN INPUT SIGNAL

35 ON/OFF OUT OUTPUT (CONTROL SIGNAL TO TURN SYSTEM ON OR OFF).

36 MIC IN INPUT (MIC AUDIO)

37 MIC LO IN INPUT (MIC AUDIO)

38 PTT INTERLOCK IN INPUT (CONTROL SIGNAL REQUESTING TRANSMITTER TO BE ACTIVATED).

39 BUFFERED R‘X‘T‘X‘ OUT OUTPUT SIGNAL (CONTROL SIGNAL SELECTING RX OR XMT MODE OF OPERATION FOR RECEIVER OPERATION).

40 CHASSIS GROUND IN INPUT GROUND




Table 2004 - KA 594 Bus Adapter Connector (P5941) Pin Name Definitions

41 LOGIC GROUND IN INPUT GROUND

42 LOGIC GROUND IN INPUT GROUND

43 CLAR SWITCH GROUND

IN INPUT GROUND

44 POLARIZER PIN - GUIDE PIN


46 N/A -

47 N/A -

48 FAULT IN DISCRETE INPUT

49 READY IN DISCRETE INPUT

50 CLOCK IN INPUT SIGNAL




5.C.(5)(c)2 KA 594 Bus Adapter Connector (P5942)

Figure 2014 - KA 594 Bus Adapter Connector (P5942) Pin Configuration

Table 2005 - KA 594 Bus Adapter Connector (P5942) Pin Name Definitions


1 LINK CLK IN INPUT SIGNAL (OPEN COLLECTOR DRIVER).

2 ON/OFF IN INPUT SIGNAL

3 LINK DATA OUT OUTPUT SIGNAL (OPEN COLLECTOR DRIVER)

4 LINK RTN OUT OUTPUT SIGNAL (PULL UP TO +12 V)

5 AGC IN INPUT SIGNAL (CONTROL SIGNAL FROM THE KFS 594 ESTABLISHING OUTPUT LEVEL OF THE REC AUDIO OUTPUT DURING DATA MODE OPERATION).

6 PTT IN INPUT SIGNAL (MIC KEY)

7 AUDIO OUT OUTPUT SIGNAL (AUDIO)

8 AUDIO LO OUT OUTPUT SIGNAL (AUDIO)

9 RESET IN INPUT SIGNAL (RESET SYSTEM)

10 MIC IN INPUT SIGNAL (MIC AUDIO)

11 MIC LO IN INPUT SIGNAL (MIC AUDIO)







5.C.(5)(d) KAC 952 Power Amplifier/Antenna Coupler Connectors

5.C.(5)(d)1 KAC 952 Power Amplifier/Antenna Coupler Connector (P9524)

Figure 2015 - KAC 952 Connector (P9524) Pin Configuration


A NO CONNECTION -

B ALC REF & POWER OFF SENSE

IN INPUT SIGNAL (COMMON FOR ALC AND POWER OFF SIGNALS).

C A/C GND PA IN INPUT GROUND

D NO CONNECTION -

E PA XMT IN INPUT SIGNAL (CONTROL SIGNAL SELECTING RX OR XMT MODE OF OPERATION).

F RX REF IN INPUT GROUND

G NO CONNECTION -

H ALC IN INPUT SIGNAL (CONTROL SIGNAL ESTABLISHING A FIX LEVEL FOR THE DATA INPUT SIGNAL).

J NO CONNECTION -



Table 2006 - KAC 952 Connector (P9524) Pin Name Definitions

K 28 V A/C PA IN INPUT POWER (+28 V)

L PA BB0 IN INPUT SIGNAL (BIT 0 OF THE BAND SELECT CONTROL LOGIC).

M CPLR RDY OUT OUTPUT SIGNAL (STATUS SIGNAL INDICATING THE STATUS OF COUPLER SECTION).

N 28 V A/C PA IN INPUT POWER (+28 V)

P PA BB1 IN INPUT SIGNAL (BIT 1 OF THE BAND SELECT CONTROL LOGIC).

R KA 98 RELAY CONTROL

OUT

S NO CONNECTION -

T PA TUNE IN INPUT SIGNAL (CONTROL SIGNAL REQUESTING A POWER AMPLIFIER TUNING SEQUENCE).

U CPLR FAULTorCPLR SERIAL LINK

OUT OUTPUT SIGNAL (STATUS SIGNAL INDICATING COUPLER FAULT STATUS).

V PA LOGIC REF IN INPUT SIGNAL (SIGNAL COMMON PA CONTROL LOGIC).

W CPLR BYPASSorCPLR SERIAL LINK COMMAND

IN INPUT SIGNAL (CONTROL SIGNAL DISABLING OR ENABLING COUPLER).

X PA BB2 IN INPUT SIGNAL (BIT 2 OF THE BAND SELECT CONTROL LOGIC).

Y NO CONNECTION - -

Z NO CONNECTION - -




5.C.(5)(d)2 KAC 952 Power Amplifier/Antenna Coupler Connector (P9526)

Figure 2016 - KAC 952 (-02,-12) Connector (P9526) Pin Configuration


A C9 DRIVER OUT OUTPUT SIGNAL (DRIVE SIGNAL TO RELAY COIL. RELAY ADD’S OR REMOVE’S 510 pF FROM SYS 1 ANTENNA NETWORK).

B C10 DRIVER OUT OUTPUT SIGNAL (DRIVE SIGNAL TO RELAY COIL. RELAY ADD’S OR REMOVE’S 1020 pF FROM SYS 1 ANTENNA NETWORK).

C C11 DRIVER OUT OUTPUT SIGNAL (DRIVE SIGNAL TO RELAY COIL. RELAY ADD’S OR REMOVE’S 2000 pF FROM SYS 1 ANTENNA NETWORK).

D +28 V RELAY BUS OUT OUTPUT SIGNAL (+28 V POWER SOURCE FOR SWITCHING RELAYS).

E C9 DRIVER OUT OUTPUT SIGNAL (DRIVE SIGNAL TO RELAY COIL. RELAY ADD’S OR REMOVE’S 510 pF FROM SYS 2 ANTENNA NETWORK).

F C10 DRIVER OUT OUTPUT SIGNAL (DRIVE SIGNAL TO RELAY COIL. RELAY ADD’S OR REMOVE’S 1020 pF FROM SYS 2 ANTENNA NETWORK).



Table 2007 - KAC 952 (-02,-12) Connector (P9526) Pin Name Definitions

G C11 DRIVER OUT OUTPUT SIGNAL (DRIVE SIGNAL TO RELAY COIL. RELAY ADD’S OR REMOVE’S 2000 pF FROM SYS 2 ANTENNA NETWORK).

H NO CONNECTION -

J EXT. CAP SENSE IN INPUT SIGNAL (KA 159 SENSE)

K EXT. CAP SENSE IN INPUT SIGNAL (KA 159 SENSE)




5.C.(5)(e) KTR 953 Receiver/Exciter Connector

Figure 2017 - KTR 953 Receiver/Exciter Connector (P9531) Pin Configuration


1 SELCAL AF OUT HI OUT OUTPUT SIGNAL (SELCAL AUDIO OUTPUT)

2 ON/OFF IN NPUT SIGNAL (CONTROL SIGNAL TO TURN SYSTEM ON OR OFF).

3 +12 V OUT OUTPUT POWER (+12 V)

4 PWR ON RESET OUT OUTPUT SIGNAL (CONTROL SIGNAL ALLOWING A POWER ON SYSTEM RESET).

5 +192 V IN OUTPUT POWER (+192V)

6 SYN DATA IN INPUT SIGNAL (CLOCK SIGNAL FOR SYNTHESIZER TUNING SERIAL.

7 CLARIFIER ON/OFF IN INPUT SIGNAL (CONTROL SIGNAL ENABLING OR DISABLING CLARIFIER CIRCUITS).

8 RX AM IN INPUT SIGNAL (CONTROL SIGNAL SELECTING AM MODE OF OPERATION FOR RECEIVER OPERATIONS).

9 RX XMT IN INPUT SIGNAL (CONTROL SIGNAL SELECTING RX OR XMT MODE OF OPERATION FOR RECEIVER OPERATIONS).



10 RX TUNE IN INPUT SIGNAL (CONTROL SIGNAL REQUESTING A RECEIVER TUNING SEQUENCE).

11 VOL VAR IN INPUT SIGNAL (CONTROL SIGNAL FOR VOLUME OF SYSTEM AUDIO OUTPUT).

12 500 OHM AUDIO LO OUT OUTPUT SIGNAL (HEADPHONE AUDIO)

13 VOL & SQUELCH REF IN INPUT GROUND

14 500 OHM AUDIO HI OUT OUTPUT SIGNAL (HEADPHONE AUDIO)

15 SQUELCH IN INPUT SIGNAL (CONTROL SIGNAL FOR THE SQUELCH CIRCUIT).

16 ALC REF & PWR OFF SENSE

IN INPUT SIGNAL (REFERENCE COMMON FOR ALC CIRCUIT AND PWR OFF CIRCUIT).

17 CLARIFIER CW IN INPUT SIGNAL (CONTROL SIGNAL COMMANDING CLARIFIER CIRCUITS TO INCREASE LOCAL OSCILLATOR FREQUENCY).

18 RX 28 V OUT

19 A3A IN INPUT SIGNAL (CONTROL SIGNAL TO ACTIVATE OR DEACTIVATE A3A EMISSION MODE).

20 NO CONNECTION -

21 SYN CLK IN INPUT SIGNAL (CLOCK SIGNAL FOR SYNTHESIZER TUNING SERIAL DATA BUS).

22 NO CONNECTION -

23 SELCAL AF OUT LO OUT OUTPUT SIGNAL (SELCAL AUDIO OUTPUT)

24 NO CONNECTION -




25 SYN STROBE IN INPUT SIGNAL (STROBE SIGNAL FOR SYNTHESIZER TUNING SERIAL DATA BUS).

26 NO CONNECTION -

27 MIC KEY IN INPUT SIGNAL (STATUS SIGNAL INDICATING MIC KEY STATUS).

28 NO CONNECTION -

29 NO CONNECTION -

30 NO CONNECTION -

31 600 OHM DATA IN HI IN INPUT SIGNAL (DATA SIGNAL)

32 600 OHM DATA IN LO IN INPUT SIGNAL (DATA SIGNAL)

33 MIC AUDIO LO IN INPUT SIGNAL (MIC AUDIO)

34 RX 28 V OUT POWER OUTPUT (+28 V)

35 +5 V OUT OUTPUT POWER (+5 V

36 -26 V OUT OUTPUT POWER (-26 V)

37 NO CONNECTION -

38 CLARIFIER CCW IN INPUT SIGNAL (CONTROL SIGNAL COMMANDING CLARIFIER CIRCUITS TO DECREASE LOCAL OSCILLATOR FREQUENCY).

39 CLARIFIER ARM IN INPUT SIGNAL (CONTROL SIGNAL TO ACTIVATE OR DEACTIVATE CLARIFIER CIRCUITS).

40 ALC IN INPUT SIGNAL (AUTO LEVEL CONTROL SIGNAL FOR THE DATA INPUT).

41 500 OHM AUDIO LO IN INPUT GROUND

42 RX REF IN INPUT GROUND

43 LOGIC REF IN INPUT GROUND

44 RX REF OUT INPUT GROUND




Table 2008 - KTR 953 Receiver/Exciter Connector (P9531) Pin Name Definitions

45 RX BB2 IN INPUT SIGNAL (BIT 2 OF THE RECEIVER BAND DATA).

46 RX BB1 IN INPUT SIGNAL (BIT 1 OF RECEIVER BAND DATA. BIT 1 CONTROLS THE ACTIVE STATUS OF UNIT #2 IN A DUAL SYSTEM).

47 OVEN & SYN RDY OUT OUTPUT SIGNAL (SYN STATUS SIGNAL).

48 RX BB0 IN INPUT SIGNAL (BIT 0 OF RECEIVER BAND DATA. BIT 0 CONTROLS THE ACTIVE STATUS OF UNIT #1 IN A DUAL SYSTEM).

49 CLARIFIER SHIELD IN INPUT GROUND

50 MIC AUDIO HI IN INPUT SIGNAL (MIC AUDIO).




5.C.(5)(f) KA 98 Antenna Connector

Figure 2018 - KA 98 Connector (P982) Pin Configuration

Table 2009 - KA 98 Connector (P982) Pin Name Definitions


A +28 Vdc IN INPUT POWER (+28 Vdc

B CONTROL IN INPUT SIGNAL (CONTROL SIGNAL TO ACTIVATE THE KA 98).

C NO CONNECTION -

D GROUND IN INPUT GROUND

E NO CONNECTION -

F NO CONNECTION -



5.C.(5)(g) KA 161 External Capacitor Connector

Figure 2019 - KA 161 External Capacitor Connector (P1612) Pin Configuration

Table 2010 - KA 161 External Capacitor Connector (P1612) Pin Name Definitions


A C9 IN INPUT SIGNAL (ACTIVATE RELAY K1 ADD 510 μf)

B C10 IN INPUT SIGNAL (ACTIVATE RELAY K2 ADD 1020 μf)

C C11 IN INPUT SIGNAL (ACTIVATE RELAY K3 ADD 2000 μf)

D +27.5 Vdc IN INPUT POWER +28 Vdc

E NO CONNECTION -

F NO CONNECTION -



5.C.(5)(h) KA 158 Bridging Amplifier Connector


Table 2011 - KA 158 Connector (P1585) Pin Name Definitions


A +28 Vdc IN INPUT POWER (RELAY POWER +28 Vdc)

B PA XMT IN INPUT SIGNAL (CONTROL SIGNAL DISABLING ANTENNA INPUT DURING TRANSMISSION, WHEN THE PRIMARY SYSTEM IS SELECTED AS THE PRIMARY TRANSMITTER).

C GND IN INPUT GROUND

D BUFFER XMT OUT OUTPUT SIGNAL (CONTROL SIGNAL DISABLING ANTENNA INPUT DURING TRANSMISSION, WHEN THE SECONDARY SYSTEM IS SELECTED AS THE PRIMARY TRANSMITTER).

E SELECT 2 IN INPUT SIGNAL (CONTROL SIGNAL SELECTING SECONDARY SYSTEM AS THE PRIMARY TRANSMITTER).

F LATCH 2 OUT OUTPUT SIGNAL (CONTROL SIGNAL ACTIVATING ONE OF THE INTERLOCK RELAYS. THIS PREVENTS THE NON-SELECTED SYSTEM FROM BEING SELECTED ONCE SYSTEM 1 OR SYSTEM 2 HAS BEEN SELECTED AS THE PRIMARY TRANSMITTER).



5.C.(5)(i) KA 160 Dual Antenna Adapter Connector


Table 2012 - A 160 Connector (P1603) Pin Configuration


A NO CONNECTION -

B +28 Vdc IN INPUT POWER (+28 Vdc)

C GND IN INPUT SIGNAL (CONTROL SIGNAL SELECTING SYSTEM 1 OR SYSTEM 2).

D NO CONNECTION -

E NO CONNECTION -

F NO CONNECTION -



5.C.(5)(j) KA 162 Dual External Capacitor Connector


Table 2013 - KA 162 Dual External Capacitor Connector (P1623)Pin Name Definitions


A C9 SYSTEM 1 IN INPUT SIGNAL (ACTIVATE RELAY ADD 1020 μf TO SYSTEM 1)

B C10 SYSTEM 1 IN INPUT SIGNAL (ACTIVATE RELAY ADD 1020 μf TO SYSTEM 1)

C C11 SYSTEM 1 IN INPUT SIGNAL (ACTIVATE RELAY ADD 2000 μf TO SYSTEM 1)

D +28 Vdc IN INPUT POWER (+28 Vdc)

E C9 SYSTEM 2 IN INPUT SIGNAL (ACTIVATE RELAY ADD 510 μf TO SYSTEM 2)

F C10 SYSTEM 2 IN INPUT SIGNAL (ACTIVATE RELAY ADD 1020 μf TO SYSTEM 2)

G C11 SYSTEM 2 IN INPUT SIGNAL (ACTIVATE RELAY ADD 2000 μf TO SYSTEM 2)

H +28 Vdc IN INPUT SIGNAL (+28 Vdc)

J X RELAY IN INPUT SIGNAL (CONTROL SIGNAL SELECTING SYS 1 OR SYS 2 CAPACITOR LOADING).

K NO CONNECTION -



5.C.(5)(k) BNC Connector Assembly (P/N 030-00005-0001)

Figure 2023 - BNC Connector (P/N 030-00005-0001) Assembly Procedure



5.C.(5)(l) HN Connector Assembly (P/N 030-00192-0000)

Figure 2024 - HN Connector (P/N 030-00192-0000) Assembly Procedure



5.C.(6) Crimping, Insertion and Extraction Tools

Crimping, insertion, and extraction tools used during the fabrication of cables are identified in “Figure 2025 - Crimping, Insertion, Extraction Tools”.

Figure 2025 - Crimping, Insertion, Extraction Tools(Sheet 1 of 2)



Figure 2025 - Crimping, Insertion, Extraction Tools(Sheet 2 of 2)



5.D Strapping Options

5.D.(1) KCU 951 Control Unit Strapping Options

Refer to “Table 2014 - KCU 951 Strapping Options” and “Figure 2026 - KCU 951 Control Board Strapping Options” for KCU 951 strapping options.

Table 2014 - KCU 951 Strapping Options

OPTION FUNCTION TO ACTIVATE

LSB Enables LSB mode Jumper P9511 pin 9 to pin 41

A3A Enables A3A mode Jumper P9511 pin 1 to pin 41

Rollover Allows carry 1 or borrow 1 for 0 to 9 and 9 to 0 rollover when selecting digits.

Jumper P9511 pin 25 to pin 41

23 MHz Limit Limits upper frequency of operation to 22.9999 MHz. (This option is standard in KCU 951 -10 thru -14)

Install jumper F on KCU 951 control board.* (See “Figure 2026 - KCU 951 Control Board Strapping Options”)

27 MHz Limit Limits upper frequency of operation to 26.9999 MHz

Install jumper E on KCU 951 control board.* (See “Figure 2026 - KCU 951 Control Board Strapping Options”

*Any channel containing a frequency above the selected limit will be altered. The user should reprogram such a channel with a desired operating frequency.



Figure 2026 - KCU 951 Control Board Strapping Options



5.D.(2) KFS 594 Miniature Control Unit Strapping Options

Refer to “Table 2015 - KA 594 / KFS 594 Strapping Option” and KFS 594 Installation/Maintenance Manual, P/N 006-05575-XXXX for KFS 594 strapping options.

5.D.(3) KA 594 Bus Adapter Strapping Options

Refer to “Table 2015 - KA 594 / KFS 594 Strapping Option” and KA 594 Installation/Maintenance Manual, P/N 006-05543-XXXX for KA 594 strapping options.

Table 2015 - KA 594 / KFS 594 Strapping Option

6. Equipment Installation

6.A Bonding Connections

6.A.(1) Special Bonding Connection and Corrosion Prevention Techniques

Because the mounting surfaces are an important part of the ground system, bonding between these surfaces requires special attention.

Note: All nonconductive finishes such as paint, anodizing films, or zinc chromate, must be totally removed from the entire mating surface before assembly. Techniques such as spot-facing or cleaning only small area of the mating surfaces do not provide adequate RF bonding.

Ground strap connections must be totally free of any non-conductive finishes.

Corrosion resistance for aluminum mating surfaces should be achieved by cleaning the aluminum surfaces with Alumiprep #33 (P/N 016-01127-0000), and then applying Alodine #1001 (P/N 016-01128-0000). Alodine #1001 (as well as Alodine #600) provides good electrical conductivity, other Alodine coatings should be avoided.

Only after the shelves are assembled and mounted, and ground straps installed, may nonconductive or poorly conductive protective finishes, such as zinc chromate be applied. Periodic inspection should be made of all bonds to ensure that corrosion is not occurring.

OPTION FUNCTION TO ACTIVATE

LSB Enables LSB mode Allow pin 14 of connector P5941 to float.



6.A.(2) Bonding Strap Considerations

Make bonding straps as short as practical and installed in such a manner that the resistance of each connection does not exceed 0.003 ohms. The straps must not interfere with moveable aircraft elements, such as surface controls, nor should the movements of these elements result in damage to the bonding straps. Physical thickness of the strap is not important in RF application but the strap must not interfere with the operations of the shock mounts. Typical strap thickness is 0.010 inches.

Note: Braid is not acceptable in RF bonding applications.

6.B KCU 951 Control Unit Installation

The KCU 951 Control Unit is installed in standard aircraft Dzus rails. If the aircraft is not equipped with Dzus fittings, refer to “Figure 2028 - KCU 951 Control Unit Outline and Mounting Drawing” for dimensions and to Paragraph “1.D Equipment Required But Not Supplied” for part numbers of Dzus rails. Dzus rails are not supplied with KHF 950 HF/SSB system installation kits, but may be ordered separately.

6. B.(1) Select a mounting location. Refer to “Figure 2028 - KCU 951 Control Unit Outline and Mounting Drawing” for proper placement dimensions.

6. B.(2) If the aircraft is equipped with Dzus fasteners, secure the KCU 951 Control Unit into place with four (4) Dzus locks on the face plate.

6. B.(3) If the aircraft is not equipped with Dzus fasteners, installation of Dzus rails will be necessary.

6. B.(4) Select appropriate field selectable options. Refer to “Table 2014 - KCU 951 Strapping Options” and “Figure 2026 - KCU 951 Control Board Strapping Options”.

6. B.(5) Connect P9511 to control unit and mount with Dzus fasteners.

6.C KFS 594 Miniature Control Unit Installation

Refer to “Figure 2029 - KFS 594 Outline and Mounting Drawing” and KFS 594 Installation/Maintenance Manual, P/N 006-05575-XXXX.



6.D KA 594 Bus Adapter Installation

Refer to “Figure 2030 - KA 594 Outline and Mounting Drawing” and KA 594 Installation/Maintenance Manual, P/N 006-05543-XXXX.

6.E KAC 952 Power Amplifier/Antenna Coupler Installation

6.E.(1) Mounting Location

Select a mounting location for the KAC 952 Power Amplifier/Antenna Coupler. Refer to Paragraph “5.B.(4) KAC 952 Power Amplifier/Antenna Coupler Mounting Location”.

6.E.(2) Power Requirements

The KAC 952 Power Amplifier/Antenna Coupler will operate from a 28 +10/-20% Vdc power supply. The unit must be connected to the aircraft power supply with a circuit breaker with not less than a 25 Amp rating. A fuse block and fuses shown in the interconnect drawing should be installed to protect individual units of the KHF 950 HF/SSB system. See Paragraph “6.E.(3) Speech Processed System Considerations” for special fuse block considerations in a speech processed system. Fuses are not provided. A 12 Vdc to 28 Vdc conversion is shown in “Figure 2047 - KHF 950 12 Vdc to 28 Vdc Conversion”.

6.E.(3) Speech Processed System Considerations

Systems that employ speech processing (i.e., KTR 953 -10,-11) are more susceptible to noise on the microphone input line to the KTR 953 Receiver/Exciter. This is due to the higher effective microphone sensitivity of the speech processed unit. Care should be taken that the microphone cable is not routed in the same harness as the DC power to the KAC 952 Power Amplifier/Antenna Coupler or other high current lines. To further reduce potential interference, a special fuse block (P/N 071-00029-0000) which contains filter capacitors, must be installed near the KAC 952 Power Amplifier/Antenna Coupler.

6.E.(4) Grounding Requirements

Note: The importance of properly RF bonding the KAC 952 Power Amplifier/Antenna Coupler to the airframe cannot be over emphasized.

Note: Except for the ground provided by the feedline coax shield, bonding should not be done with braided wire, but with solid conductive straps, typically one inch wide.



Good RF bonding of the KAC 952 Power Amplifier/Antenna Coupler to the aircraft fuselage is basic in achieving maximum efficiency from the system and eliminating any possible interference to other systems in the aircraft. See Paragraph “6.A Bonding Connections” for bonding considerations.

In each installation the KAC 952 Power Amplifier will be RF bonded to the airframe four ways. Refer to “Figure 2027 - KAC 952 Grounding Detail”.

6.E.(4)(a) The KAC 952 Power Amplifier/Antenna Coupler mounting tray is bonded to the mounting surface or shelf with two ground straps (provided in installations kit).

6.E.(4)(b) The ground stud on the KAC 952 Power Amplifier/Antenna Coupler is directly bonded to the mounting surface or shelf with a ground strap (provided in installation kit).

6.F.(4)(c) The ground stud on the KAC 952 Power Amplifier/Antenna Coupler is bonded directed to the skin or airframe structure with a ground strap (provided in installation kit).

6.E.(4)(d) The KAC 952 Power Amplifier/Antenna Coupler is bonded to the skin of the aircraft via the shield of the antenna feed coax.

6.E.(5) After a location has been selected, remove the mounting tray from the four shock mounts.

6.E.(6) Place each shock mount dead center over each center tap position.

6.E.(7) Drill four #8 holes per each shock mount.

6.E.(8) Thoroughly clean the mounting surface where the bonding straps will be attached. If the surface is aluminum, apply Alodine #1001 per Paragraph “6.A.(1) Special Bonding Connection and Corrosion Prevention Techniques”.

6.E.(9) Mount the shock mounts to the mounting surface with four each # 8-32 fasteners and lock nuts, installing the two Tray ground straps and the unit straps under the appropriate shock mounts.

Note For vertical mount (5-10 lb.) shock mounts go under the heat sink side.



Figure 2027 - KAC 952 Grounding Detail



6.E.(10) Attach the mounting tray to the four shock mounts, installing the two tray ground straps.

6.E.(11) With the mounting tray secured, locate a point on the airframe structure near the antenna feedthru for attaching a unit to airframe ground strap. Drill two #6 holes and clean and Alodine per Paragraph “6.A.(1) Special Bonding Connection and Corrosion Prevention Techniques”. Connect a ground strap between this point and the KAC 952 Power Amplifier/Antenna Coupler ground stud.

Note: This strap should not be braided wire, but solid strap.

6.E.(12) Place the KAC 952 Power Amplifier/Antenna Coupler unit into the mounting tray and secure in place with two knurled knobs. Provisions for safety wire installation is provided if desired.

6.F KTR 953 Receiver/Exciter Installation

6.F.(1) Select a mounting location. Refer to Paragraph “5.B.(5) KTR 953 Receiver/Exciter Mounting Location”.

6.F.(2) After a location has been selected, remove the mounting tray from the four shock mounts.

6.F.(3) With the shock mounts removed and the tray laying flat against the mounting structure, center tap four positions from where the shock mounts mount to the tray.

6.F.(4) Place each shock mount dead center over each center tap position.

6.F.(5) Drill two #6 holes per each shock mount.

6.F.(6) Clean and alodine the mounting surface where the ground strap will be attached. See Paragraph “6.A.(1) Special Bonding Connection and Corrosion Prevention Techniques”.

6.F.(7) Mount the shock mounts with two each #6-32 fasteners and lock-nuts, installing the ground strap under the appropriate shock mount.

6.F.(8) Attach the mounting tray to the four shock mounts, installing the ground strap.

6.F.(9) Slide the KTR 953 Receiver/Exciter into the mounting tray. Secure the KTR 953 Receiver/Exciter into place on the mounting tray with the fluted knob. Provisions for safety wire installation is provided if desired.



6.G Antenna Installation

6.G.(1) Selecting an Antenna Configuration.

While numerous options are available in the choice of antenna configurations, some configurations will be better suited for a particular installation than others. Refer to Paragraph “5.B.(6) Antenna Location” when selecting an antenna configuration.

6.G.(2) Antenna Bonding

Refer to Paragraph “6.A.(1) Special Bonding Connection and Corrosion Prevention Techniques” for special bonding consideration when installing an antenna configuration.

6.G.(3) Antenna configurations other than KA 98 Antenna.

Refer to installation instructions provided by manufacturer.

6.G.(4) KA 98 Antenna Installation

6.G.(4)(a) Refer to “Figure 2033 - KA 98 Outline and Mounting Drawing” for special installation notes and mounting dimensions.

Note: Maintain at least 10 inch separation between clamps.

6.G.(4)(b) Drill two holes (0.344 DIA) in the mounting plate for the two antenna mounting clamps. Insert mounting studs into holes and secure the to mounting plate by tightening fastening nuts.

6.G.(4)(c) Attach bottom half of mounting clamps to the secured mounting studs.

6.G.(4)(d) Place the base section of the KA 98 Antenna into the bottom half of the mounting clamps. Place the top half of mounting clamp over the bottom half of the securing clamp.

Note: Antenna base section must be installed to allow drain hole to be at the lowest point of installation.

6.G.(4)(e) Tighten the fasteners holding the two half section together. Tighten set screw in the center of each securing clamp to secure the base section in the mounting clamp.

6.G.(4)(f) Attach the antenna cable to the antenna base at connection P981. Attach the band switch control cable to the antenna base at connection P982.



6.G.(4)(g) Attach the whip section of the KA 98 Antenna to the base section. Tighten set screw in the whip to secure the whip section.

6.H KA 161 External Capacitor Installation

NOTE: Refer to Paragraph “6.A.(1) Special Bonding Connection and Corrosion Prevention Techniques” for special bonding instructions.

6.H.(1) Find a suitable location for the KA 161 External Capacitor. The feedline between the KA 161 External Capacitor and KAC 952 Power Amplifier/Antenna Coupler must not be more than 12 inches in length. For installation containing -00 versions of the KA 161 External Capacitor the antenna feed point must not be longer than 6 inches.

6.H.(2) Drill the hole pattern and mount the KA 161 External Capacitor as per the appropriate installation drawing “Figure 2034 - KA 161 External Capacitor (-00) Outline and Mounting Drawing”, “Figure 2035 - KA 161 External Capacitor (-01) Outline and Mounting Drawing”, or “Figure 2036 - KA 161 External Capacitor (-02) Outline and Mounting Drawing”.

6.H.(3) Place KA 161 External Capacitor against mounting surface. Tighten fasteners to secure the KA 161 External Capacitor to the mounting surface.

NOTE: If installing -00 version of KA 161 External Capacitor on skin of aircraft insert gasket (P/N 187-01264-0004) between the skin of the aircraft and the KA 161 External Capacitor.

6.H.(4) Attach appropriate cables to the KA 161 External Capacitor at connections P1611, and P1612.

NOTE: If installing -00 version of KA 161 External Capacitor, remove cover on KA 161 External and loosen stop cap nut on the feedthru before mounting. Re-torque the stop cap nut to 12 in-lbs. after installation.

6.H.(5) Attach antenna to KA 161 External Capacitor at antenna connector.

6.I KA 158 Bridging Amplifier Installation

6.I.(1) Remove the connection between J9522 and J9523 of the KAC 952 Power Amplifier/Antenna Coupler.

6.I.(2) Remove the #4 screw to the right of the connectors.



6.I.(3) Mount the KA 158 Bridging Amplifier on the two BNC connectors and replace the #4 screw through the support plate of the KA 158.

6.I.(4) Attach appropriate cable to the KA 158 Bridging amplifier, refer to appropriate interconnect wiring diagram.

6.J KA 160 Dual Antenna Adapter Installation


6.J.(1) Find a suitable location for the KA 160 Dual Antenna Adapter. The feedline between the KA 160 and KAC 952 Power Amplifier/Antenna Coupler must not be more than 12 inches in length. For installation containing -00 versions of the KA 160 Dual Antenna Adapter and the antenna feedline must not be longer than 6 inches.

6.J.(2) Drill the hole pattern and mount the KA 160 Dual Antenna Adapter as per the appropriate installation drawing “Figure 2039 - KA 160 Dual Antenna Adapter (-00) Outline and Mounting Drawing”, “Figure 2040 - KA 160 Dual Antenna Adapter (-01) Outline and Mounting Drawing”, or “Figure 2041 - KA 160 Dual Antenna Adapter (-02) Outline and Mounting Drawing”.

6.J.(3) Place KA 160 Dual Antenna Adapter against mounting surface. Tighten fasteners to secure the KA 160 Dual Antenna Adapter Capacitor to the mounting surface.

NOTE: If installing -00 version of KA 160 Dual Antenna Adapter on the skin of aircraft, insert gasket (P/N 187-01264-0004) between the skin of the aircraft and the KA 160 Antenna Adapter.

6.J.(4) Attach appropriate cables to the KA 160 Antenna Adapter at connections P1601, P1602, and P1603.

NOTE: If installing -00 version of KA 160 Dual Antenna Adapter, remove cover on KA 160 Dual Antenna Adapter and loosen stop cap nut on the feedthru before mounting. Re-torque the stop cap nut to 12 in-lbs. after installation.

6.J.(5) Attach antenna to KA 160 Dual Antenna Adapter at the antenna connectors.



6.K KA 162 Dual External Capacitor Installation


6.K.(1) Find a suitable location for the KA 162 Dual External Capacitor. The feedline between the KA 162 Dual External Capacitor and KAC 952 Power Amplifier/Antenna Coupler must not be more than 12 inches in length.

6.K.(2) Drill the hole pattern and mount the KA 162 Dual External Capacitor per the appropriate installation drawing “Figure 2042 - KA 162 Dual External Capacitor (-01)”, or “Figure 2043 - KA 162 Dual External Capacitor (-02)”.

6.K.(3) Place KA 162 Dual External Capacitor against mounting surface. Tighten fasteners to secure the KA 162 Dual External Capacitor to the mounting surface.

6.K.(4) Attach appropriate cables to the KA 162 Dual External Capacitor at connections P1621, P1622, and P1623.

6.K.(5) Attach antenna to KA 162 Dual External Capacitor at antenna connector.



7. Inspection, System Checkout, and Flight Test Procedures

7.A. Inspection

“Table 2017 - Inspection/Check Procedure” is a visual inspection/check procedure that should be performed after the system installation as part of a system checkout. In addition, the procedure can be used as periodic maintenance inspection check.

EQUIPMENT INSPECTION/CHECK PROCEDURE

KCU 951 (1) Inspect the control unit for any sign of damage.(2) Check that the control panel has been properly installed and that retaining mechanism and connectors are securely tightened.

KFS 594 Refer to Installation/Maintenance Manual, P/N 006-05575-XXXX

KA 594 Refer to Installation/Maintenance Manual, P/N 006-05543-XXXX

KAC 952 (1) Inspect unit for any sign of damage.(2) Check that the unit has been properly installed and that retaining mechanism and connector.(3) Check that ground straps are attached and that there are no signs of corrosion at bonding points.

KTR 953 (1) Inspect unit for any sign of damage.(2) Check that the unit has been properly installed and that retaining mechanism and connectors are securely tightened.(3) Check that ground straps are attached and that there are no signs of corrosion at bonding points.

KA 98 (If installed) (1) Inspect unit for any sign of exterior damage.(2) Check that the antenna has been properly installed and that all retaining fasteners and connectors are securely tightened.(3) Check that there are no signs of corrosion at bonding points.

KA 161 (If installed) (1) Inspect unit for any sign of damage.(2) Check that the unit has been properly installed and that retaining mechanism and connectors are securely tightened.(3) Check that there are no signs of corrosion at bonding points.



Table 2017 - Inspection/Check Procedure

7.B. System Checkout

7.B.(1) General

The KHF 950 HF/SSB Communication System requires three stages of post-installation testing to ensure proper operation: (1) A system interwiring check is performed before installation of system components and before power is applied, to verify that all aircraft and HF system interconnections are correct. Continuity of power pins is double-checked. (2) After system components are installed, a visual inspection of the equipment and connections is made. (3) The post-installation test applies power to system components and checks out system functions.

7.B.(2) System Interwiring Check

7.B.(2)(a) Check that all cables and interwiring are installed according to the interwiring and cable fabrication instructions. (See Paragraph “5.C Interwiring and Cable Fabrication”).

7.B.(2)(b) Check that all functions are properly strapped to reflect the aircraft system configuration. (See Paragraph “5.D Strapping Options”).

KA 158 (If installed) (1) Inspect unit for any sign of damage.(2) Check that the unit has been properly installed and that retaining mechanism and connectors are securely tightened.



EQUIPMENT INSPECTION/CHECK PROCEDURE



7.B.(2)(c) Double-check continuity of all power pins.

7.B.(3) Visual Inspection

Perform the visual inspection/check procedure. See “Table 2017 - Inspection/Check Procedure”.

7.B.(4) Post-Installation Test

7.B.(4)(a) Perform the System Performance Check in Paragraph “2. System Performance Check”.

7.B.(4)(b) Establish communications with another HF station in each of the six communication bands. (See “Table 1001 - Transmitter Test Band”). Request a signal/audio quality report.

7.C. Flight Test

While in flight, establish communications with another HF station in each of the six communication bands. (See “Table 1001 - Transmitter Test Band”). Request a signal/audio quality report.

8. Removal and Re-installation

CAUTION: REMOVE ALL POWER BEFORE PERFORMING REMOVAL AND RE-INSTALLATION PROCEDURES.

8.A KCU 951 Control Unit Removal and Re-installation

8.A.(1) KCU 951 Control Unit Removal

8.A.(1)(a) Loosen fasteners at front of unit.

8.A.(1)(b) Pull unit forward from cockpit panel and detach mating cable from rear of unit.

8.A.(2) KCU 951 Control Unit Re-installation

8.A.(2)(a) Reconnect cable connector to rear of unit.

8.A.(2)(b) Gently reinsert unit into the cockpit panel and tighten fasteners at front of unit.



8.B KFS 594 Miniature Control Unit Removal and Re-installation

Refer to KF 594 Installation/Maintenance Manual, P/N 006-05575-XXXX.

8.C KA 594 Bus Adapter Removal and Re-installation

Refer to KA 594 Installation/Maintenance Manual, P/N 006-05543-XXXX.

8.D KAC 952 Power Amplifier/Antenna Coupler Removal and Re-installation

8.D.(1) KAC 952 Power Amplifier/Antenna Coupler Removal

8.D.(1)(a) Detach cables from connectors J9525, J9524, and J9521.

8.D.(1)(b) If KA 158 Bridging amplifier is attached, detach cables from connectors J1585, J1582, and J1581.

8.D.(1)(c) Remove nut and washer on the antenna GND post. Detach ground strap. Replace nut and washer on the antenna GND post.

8.D.(1)(d) Loosen retaining screw clamp located at the front of the KAC 952 Power Amplifier/Antenna Coupler. Remove unit from mounting rack.

8.D.(2) KAC 952 Power Amplifier/Antenna Coupler Re-installation

8.D.(2)(a) Slide the KAC 952 Power Amplifier/Antenna Coupler gently into the mounting rack.

8.D.(2)(b) Engage and tighten retaining screw clamps to secure unit.

8.D.(2)(c) Reconnect appropriate cables to connectors J9525, J9524, and J9521.

8.D.(2)(d) If KA 158 Bridging Amplifier is attached, Reconnect appropriate cables to connectors J1585, J1582, and J1581.

8.E KTR 953 Receiver/Exciter Removal and Re-installation

8.E.(1) KTR 953 Receiver/Exciter Removal

8.E.(1)(a) Detach cables from connectors J9531 and J9532.

8.E.(1)(b) Loosen retaining screw clamp located at the front of the KTR 953 Receiver/Exciter. Remove unit from mounting rack.



8.E.(2) KTR 953 Receiver/Exciter Re-installation

8.E.(2)(a) Slide the KTR 953 Receiver/Exciter gently into the mounting tray.

8.E.(2)(b) Engage and tighten retaining screw clamps to secure unit

8.E.(2)(c) Reconnect appropriate cables to connectors J9531 and J9532.

8.E.(2)(d) Remove nut and washer on the antenna GND post. Attach ground strap. Replace nut and washer on the antenna GND post.

8.F KA 98 Antenna Removal and Re-installation

8.F.(1) KA 98 Antenna Removal

8.F.(1)(a) Loosen set screw in the whip of the KA 98 antenna and turn the whip section CCW to separate the whip section from the base section.

8.F.(1)(b) Detach the antenna cable at connector P981 and the band switch control cable at connector P982.

8.F.(1)(c) Locate the two clamps securing the base section of the KA 98 Antenna to the mounting surface. The clamps are composed of two half sections held together. Remove the fastener holding the half sections together and separate the two half sections. This will allow the base section of the KA 98 Antenna to be removed.

NOTE: The set screw, located center of top half of the mounting clamp, must be backed out until the tip of the set screw is even with the inner surface of the clamp before reassembly.

8.F.(1)(d) Remove the base section of the KA 98 antenna.

8.F.(2) KA 98 Antenna Re-installation


8.F.(2)(a) Place the base section of the KA 98 antenna into the bottom half of the mounting clamps. Place the top half of mounting clamp over the bottom half of the securing clamp.

NOTE: Antenna base section must be installed to allow drain hole to be at the lowest point of installation.



8.F.(2)(b) Tighten the fasteners holding the two half sections together. Tighten set screw in the center of each securing clamp to secure the base section in the mounting clamp.

8.F.(2)(c) Attach the antenna cable to the antenna base at connection P981. Attach the band switch control cable to the antenna base at connection P982.

8.F.(2)(d) Attach the whip section of the KA 98 Antenna to the base section. Tighten set screw in the whip to secure the whip section.

8.G KA 161 External Capacitor Removal and Re-installation

8.G.(1) KA 161 External Capacitor Removal

8.G.(1)(a) Detach antenna from the KA 161 External Capacitor at connector P1613.

8.G.(1)(b) Detach cables, at connectors P1612 and P1611, which connect the KA 161 External Capacitor to the KAC 952 Power Amplifier/Antenna Coupler.

8.G.(1)(c) Remove fasteners securing the KA 161 External Capacitor to the mounting surface.

8.G.(1)(d) Remove the KA 161 External Capacitor.

8.G.(2) KA 161 External Capacitor Re-installation


8.G.(2)(a) Place KA 161 External Capacitor against mounting surface. Tighten fasteners to secure the KA 161 External Capacitor to the mounting surface.

NOTE: If installing -00 version of KA 161 External Capacitor on skin of aircraft, insert gasket (P/N 187-01264-0004) between the skin of the aircraft and the KA 161 External Capacitor.

8.G.(2)(b) Attach appropriate cables to the KA 161 External Capacitor at connections P1611 and P1612.

8.G.(2)(c) Attach antenna to KA 161 External Capacitor at connector P1613.

NOTE: If installing -00 version of KA 161 External Capacitor re-torque the antenna to 12 in-lbs.



8.H KA 158 Bridging Amplifier Removal and Re-installation

8.H.(1) KA 158 Bridging Amplifier Removal

8.H.(1)(a) Detach cables from connectors J1585, J1582, and J1581.

8.H.(1)(b) Remove fastener (screw) attaching KA 158 Bridging Amplifier to KAC 952 Power Amplifier/Antenna Coupler.

8.H.(1)(c) Loosen connectors attaching the KA 158 Bridging Amplifier to connectors J9522 and J9523 of the KAC 952 Power Amplifier/Antenna Coupler. Remove the KA 158 Bridging Amplifier.

8.H.(2) KA 158 Bridging Amplifier Re-installation

8.H.(2)(a) Place the KA 158 Bridging Amplifier on the KAC 952 Power Amplifier/Antenna Coupler. Insure that the appropriate connectors are attached to J9522 and J9523. Tighten the connectors attaching the KA 158 Bridging Amplifier to the KAC 952 Power Amplifier/Antenna Coupler.

8.H.(2)(b) Reinstall fastener (screw) attaching the KA 158 Bridging Amplifier to the KAC 952 Power Amplifier/Antenna Coupler.

8.H.(2)(c) Attach appropriated cables to connectors J1585, J1582, and J1581.

8.I KA 160 Dual Antenna Adapter Removal and Re-installation

8.I.(1) KA 160 Dual Antenna Adapter Removal

8.I.(1)(a) Detach antenna from the KA 160 Dual Antenna Adapter at antenna connector.

8.I.(1)(b) Detach cables at connectors P1601, P1602, and P1603.

8.I.(1)(c) Remove fasteners securing the KA 160 Dual Antenna Adapter to the mounting surface.

8.I.(1)(d) Remove the KA 160 Dual Antenna Adapter.

8.I.(2) KA 160 Dual Antenna Adapter Re-installation




8.I.(2)(a) Place KA 160 Dual Antenna Adapter against mounting surface. Tighten fasteners to secure the KA 160 Dual Antenna Adapter to the mounting surface.

NOTE: If installing -00 version of KA 160 Dual Antenna Adapter on skin of aircraft insert gasket (P/N 187-01264-0004) between the skin of the aircraft and the KA 160 Dual Antenna Adapter.

8.I.(2)(b) Attach appropriate cables to the KA 160 Dual Antenna Adapter at connections P1601, P1602, and P1603.

8.I.(2)(c) Attach antenna to KA 160 Dual Antenna Adapter at antenna connector.

NOTE: If installing -00 version of KA 160 Antenna Adapter, re-torque the antenna to 12 in-lbs.

8.J KA 162 Dual External Capacitor Removal and Re-installation

8.J.(1) KA 162 Dual External Capacitor Removal

8.J.(1)(a) Detach antenna from the KA 162 Dual External Capacitor at antenna connector.

8.J.(1)(b) Detach cables at connectors P1621, P1622, and P1623.

8.J.(1)(c) Remove fasteners securing the KA 162 Dual External Capacitor to the mounting surface.

8.J.(1)(d) Remove the KA 162 Dual External Capacitor.

8.J.(2) KA 162 Dual External Capacitor Re-installation


8.J.(2)(a) Place KA 162 Dual External Capacitor against mounting surface. Tighten fasteners to secure the KA 162 Dual External Capacitor to the mounting surface.

NOTE: If installing -00 version of KA 162 Dual External Capacitor on skin of aircraft insert gasket (P/N 187-01264-0004) between the skin of the aircraft and the KA 162 External Capacitor.

8.J.(2)(b) Attach appropriate cables to the KA 162 Dual External Capacitor at connections P1621, P1622, and P1623.



8.J.(2)(c) Attach antenna to KA 162 Dual External Capacitor at antenna connector.

NOTE: If installing -00 version of KA 162 Dual External Capacitor, re-torque the antenna to 12 in-lbs.

9. Maintenance Procedures

9.A In-Aircraft Adjustments

All alignment and adjustment procedures are accomplished during bench maintenance. When unit performance indicates an adjustment or an alignment is required technician should remove the unit from the aircraft, then reference should be made to the related Maintenance Manual.

9.B System Protection

There are no fuses integral to the KHF 950 HF/SSB Communication System. The system is protected by circuit breakers located at the circuit breaker panel in the aircraft. A fuse block may be used to provide individual unit protection, if desired.

NOTE: KHF 950 HF/SSB Communication Systems with Voice Processing require a special fuse block with noise filtering that may be independent of the breaker panel.

9.C Lubrication

No lubrication is required. There are no moving parts that require lubrication in the KHF 950 HF/SSB Communication System.

9.D Cleaning

The exterior of the units should be wiped with lint-free cloth dampened with the approved cleaning agent, when deemed necessary, depending upon environmental exposure and intensity of use.

NOTE: Limit cleaning of equipment interiors to that required at bench overhaul.

10. System Maintenance Programs

10.A System Maintenance Recommendations

10.A.(1) Perform a system performance check when a component of the system is replaced or installed.



10.A.(2) To confirm satisfactory system operation a system performance test may be performed as required.

10.A.(3) After major aircraft maintenance cycles a system performance check should be performed.

10.B Field Alignment of KTR 953 Receiver/Exciter (-51, -53)

Data inputs and outputs are factory adjusted to 0 dBm arms into their respective impedances. Should readjustment be required for a particular installation remove the KTR 953 Receiver/Exciter (-51, -53 only) from the aircraft and perform the following procedures.

10.B.(1) Data Input

10.B.(1)(a) Apply a single modulating tone (at a frequency within the Receiver/Exciter passband) to the DATA IN pins at 0 dBm (0.77 Vrms across 600 ohms) or other appropriate level.

10.B.(1)(b) Monitor TP1001 with a AC coupled RMS reading voltmeter or an oscilloscope.

10.B.(1)(c) Pull the DATA strapping line to ground to select the data mode of operation. Apply DC power to the system and turn the system ON.

10.B.(1)(d) In the receive mode adjust DATA IN adjustment (R1031) to provide 1.4 Vrms on the voltmeter or 4.0 Vp-p on the oscilloscope.

10.B.(2) Data Outputs

10.B.(2)(a) Apply a 1000 μV, 12001.0 kHz unmodulated RF input signal to J9532.

10.B.(2)(b) With the system on, select USB at 1200.0 kHz on the control head.

10.B.(2)(c) Select the data Mode by grounding the DATA Line.

10.B.(2)(d) Monitor DAT OUT 1 pins with a RMS ACVM or an oscilloscope and terminate with a 500 ohm load.

10.B.(2)(e) Adjust DATA OUT 1 adjustment (R1023) to provide 0 dBm (0.77 Vrms or 2.0 Vp-p) or other desired level.

10.B.(2)(f) Monitor DATA OUT 2 pins with a RMS ACVM or an oscilloscope and terminate with a 600 ohm load.



10.B.(2)(g) Adjust DATA OUT 2 adjustment (R1021) to provide 0 dBm (0.77 Vrms or 2.0 Vp-p) or other desired level.

10.B.(3) Perform the system performance test in Paragraph “2. System Performance Check”.



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Figure 2028 - KCU 951 Control Unit Outline and Mounting Drawing(P/N 155-05347-0000 Rev.3)

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Figure 2029 - KFS 594 Outline and Mounting Drawing(Dwg P/N 155-05412-0000 Rev 2)

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Figure 2030 - KA 594 Outline and Mounting Drawing(Dwg P/N 155-05402-0000 Rev 2)

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Figure 2031 - KAC 952 Outline and Mounting Drawing(Dwg P/N 155-05348-0000 Rev 12)

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Figure 2032 - KTR 953 Outline and Mounting Drawing(Dwg P/N 155-05349-0000 Rev 6)

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Figure 2033 - KA 98 Outline and Mounting Drawing(Dwg P/N 155-05419-0000 Rev 0)

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Figure 2034 - KA 161 External Capacitor (-00) Outline and Mounting Drawing(Dwg P/N 155-05410-0000 Rev 2)

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Figure 2037 - Dual KAC 952 Outline and Mounting(Dwg P/N 155-05420-0000 Rev 3)

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Figure 2038 - Dual KTR 953 Outline and Mounting Drawing(Dwg P/N 155-05422-0000 Rev 1)

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Figure 2039 - KA 160 Dual Antenna Adapter (-00) Outline and Mounting Drawing(Dwg P/N 155-05409-0000 Rev 2)

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Figure 2042 - KA 162 Dual External Capacitor (-01) Outline and Mounting Drawing (Dwg P/N 155-05404-0001 Rev AA)

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Figure 2043 - KA 162 Dual External Capacitor (-02)Outline and Mounting Drawing (Dwg P/N 155-05404-0002 Rev 1)

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Figure 2044 - KHF 950 (KCU 951) with KA 98 Antenna Interconnect Drawing(Dwg P/N 155-01361-0000 Rev 13)

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Figure 2045 - KHF 950 KCU 951) Interconnect Drawing(Dwg P/N 155-01361-0001 Rev 2)

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Figure 2046 - KHF 950 12 Vdc to 28 Vdc ConversionSystem Interconnect Drawing (Dwg P/N 155-01417-0000 Rev 1 - Sheet 1 of 2)

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Figure 2047 - KHF 950 12 Vdc to 28 Vdc ConversionSystem Interconnect Drawing (Dwg P/N 155-01417-0000 Rev 1 - Sheet 2 of 2)

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Figure 2048 - Dual KHF 950 (KCU 951) with KA 160 Dual Antenna AdapterManual Select Interconnect Drawing (Dwg P/N 155-01419-0000 Rev 5)

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Figure 2049 - Dual KHF 950 (KCU 951) with KA 160 Dual Antenna AdapterAuto Select Interconnect Drawing (Dwg P/N 155-01419-0001 Rev 6)

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Figure 2050 - KHF 950 (KCU 951) with KA 161 External CapacitorInterconnect Drawing (Dwg P/N 155-01420-0000 Rev 3)

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Figure 2051 - Dual KHF 950 (KCU 951) with KA 162 Dual External Capacitor Interconnect Drawing (Dwg P/N 155-01425-0000 Rev 6)

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Figure 2053 - Dual KHF 950 (KCU 951) with KA 162 Dual External Capacitor Auto Select Interconnect Drawing (Dwg P/N 155-01425-0001 Rev 6)

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Figure 2052 - Dual KHF 950 Auto Select Interlock Functional Block Diagram

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Figure 2055 - Dual KHF 950 (KA 594/KFS 594) with KA 162 Dual External Capacitor Interconnect Drawing (Dwg P/N 155-01427-0000 Rev 7)

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Figure 2053 - Dual KHF 950 (KA 594/KFS 594) with KA 162 Dual ExternalCapacitor Auto Select Interconnect Drawing (Dwg P/N 155-01427-0001 Rev 8)

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Figure 2054 - KTR 953 (Data -5X) Interconnect Drawing(Dwg P/N 155-01361-0002 Rev 2)

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Figure 2055 - KHF 950 (KA 594/KFS 594) with KA 161 External CapacitorInterconnect Drawing (Dwg P/N 155-01428-0000 Rev 5)

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Figure 2056 - KHF 950 (KA 594/KFS 594) with KA 98 AntennaInterconnect Drawing (Dwg P/N 155-01437-0000 Rev 3)

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Figure 2057 - Dual KHF 950 (KA 594/KFS 594) with KA 160 Dual AntennaAdapter Manual Select Interconnect Drawing (Dwg P/N 155-01438-0000 Rev 4)

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Figure 2058 - Dual KHF 950 (KA 594/KFS 594) with KA 160 Dual AntennaAdapter Auto Select Interconnect Drawing (Dwg P/N 155-01438-0001 Rev 6)

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