INSTRUCTION MANUAL

SELECTIVE LEVELMETER

MODELS 3121B, 3126B, 3132

WØCCW

RYCOM INSTRUMENTS Rai1~ay Communications f Inc.

9351 East 59th Street Raytown f Missouri

INSTRUCTION MANUAL

SELECTIVE LEVELMETER

MODELS 3121B f 3126B f 3132

STANDARD INSTRUMENTS

MODEL SELECTIVITY

(MEASURE) COUNTER OUTPUT

MODULE INSTRUMENT SERIAL NO.

3121B 100 Hz YES

3121B 250 Hz NO

3126B 250 Hz NO

3132 100 Hz YES

3132 250 Hz NO

(Manual No. 3121-341)

3-72

WØCCW

CERTIFICATION

The RYCOM Instruments Company certifies that this instrument was thoroughly tested and inspected and found to meet its published specifications when it was shipped from the factory.

WARRANTY AND ASSISTANCE

All RYCOM Instruments Products are warranted against defects in material and workmanship. This warranty applies for one year from the date of delivery, or, in the case of certain major components listed below for the specified period we will repair or replace products that prove to be defective during the warranty period. No other warranty is expressed or implied. We are not liable for consequential damages.

Exceptions in our products using dry batteries or Ni-Cad batteries the above warranty applies to the equipment only. Ni-Cad batteries are Bubject to original manufacturers inspection.

Where it is necessary to return the instrument to the factory, furnish in­formation to the nature of trouble encountered. Ship prepaid to:

RYCOM INSTRUMENTS 9351 East 59th Street Raytown, Missouri 64133

Attention: Service Department

---,

3-72

LIST OF EFFECTIVE PAGES

Total Number of Pages in This Publication is 70

Page No. Issue Page No. Issue

Title Warranty A B Blank i thru iv 1 thru 3 4 Blank 5 thru 51 52 Blank 53

Original Original Original Original Original Original Original Original Original Original

54 Blank 55 56 Blank 57 58 Blank 59 60 Blank 61 62 Blank

Original Original Original Original Original Original Original Original Original

*An asterisk indicates pages changed, added, or deleted by the latest revision.

Effective Pages 3-72 Page AlB

TABLE OF CONTENTS

CHAPTER I GENERAL

1. Scope. 1 2. Description 1

CHAPTER II OPZRATION

1. Preparation. 5 2. Operating Controls and Indicators. 5 3. Battery 7 4. Calibration. 7 5. Line Measurements, Models 3l2lB (Unbalanced) and 3132 8 6. Model 3l2lB Line Measurements--Balanced. 8 7. INPUT SELECTOR Setting and Meter Correction, Models 312lB and 3132. 9 8. Model 3l26B Line Measurements--INPUT Jacks. 10 9. Model 3126B Line Measurements--20-Pin Connector. 10

10. INPUT SELECTOR Setting and Meter Correction, Model 3l26B 11 11. Monitoring 12 12. Counter Output 12

CHAPTER III THEORY OF OPERATION

1. General 13 2. Input Module AI. 14 3. Emitter-Follower and Calibrate Oscillator Module A2. 14 4. Lowpass Filter FL3. 14 5. Oscillator-Modulator Module A3. 14 6. I-f Amplifier Module A4 . 14 7. Demodulator Module AS. 15 8. Audio Amplifier Module AS 15 9. Regulator Module AS 16

10. Ac Power Supply and Charger Module A6 16 11. Counter Output Module A7. 16

CHAPTER IV MAINTENANCE

1. Introduction. 17 2. Test Equipment 17 3. Trouble Shooting 18 4. Alignment. 24

CHAPTER V PARTS LIST

1. How to Order Parts. 29 2. List of Manufacturers. 29

3-72 i

LIST OF TABLES

Table No.

1 2 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18 19

Description

Specifications . Operating Controls and Indicators. Models 3l2lB and 3132 Calibration. Models 312lB and 3132 INPUT SELECTOR Setting and Meter Correction Model 3l26B INPUT SELECTOR Setting and Meter Correction Test Equipment • Module Isolation Regulator Module A5 Trouble Shooting. Power Supply and Charging Circuit Module A6 Input Module Al Trouble Shooting . Emitter-Follower Module A2 Trouble Shooting

Trouble Shooting.

Calibrate Oscillator Module A2 Trouble Shooting • Lowpass Filter FL3 Trouble Shooting . Local Oscillator Module A3 Trouble Shooting I-f Amplifier Module A4 Trouble Shooting Reinsertion Oscillator Module A5 Trouble Shooting Audio Amplifier Module AS Trouble Shooting. Transistor Voltage Chart. . • • • '. Integrated Circuit Voltages.

LIST OF ILLUSTRATIONS

Figure~

Description

1 2 3 4 5

Models 3l2lB and 3l26B Selective Levelmeters Model 3132 Selective Levelmeter Test Setup for Module Isolation Test Setup for Level Calibration • Test Setup for Frequency Alignment

.

6 Module A2. 7 Module A3. 8 Module A4. 9 Hodule A5.

10 Module A7. 11 Block Diagram l2A 3l2lB Input, Schematic l2B 3126B Input, Schematic l2C 3132 Input, Schematic. 12 Selective Levelmeter, 13 Counter Output Hodule,

Basic Schematic Schematic .

Page

2 5 8 9

11 17 18 19 20 20 21 21 21 22 22 22 23 23 24

Page

iii iv 18 24 27 48 48 49 50 50 51 53 55 57 59 61

ii 3-72

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Figure 1 Models 3l21B and 3l26B Selective Levelrneters

3-72 iii

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Figure 2 Model 3132 Selective Levelmeter

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iv 3-72

L

CHAPTER I GENERAL

SCOPE.

This manual describes the following RYCOM instruments:

Model 3l2lB Selective Levelmeter Model 3l26B Selective Levelmeter Model 3132 Selective Levelmeter

2. DESCRIPTION.

All the instruments are intended for general use where it is desired to measure the level of individual or narrow bands of frequencies. Each can be operated with its internal battery, or from 115 volts, 50 to 400 Hz, which is also used to charge the battery.

Table 1 lists the specifications and figures 1 and 2 show the instruments.

The instruments are all fully transistorized. Each measures voltage from 7.75 microvolts to 10 volts (-100 dBm to +22 dBm) in the frequency range 1 to 1500 kilohertz. Excepting Model 3l26B (250 Hz only), each instrument has a 100- or 2s0-Hz bandwidth filter that makes it particularly useful for analyzing closely spaced signals, complex waveforms, determining carrier system levels, and check­ing amplitude modulation percentages. Included is a 2.s-kHz bandwidth filter that has a ±O.s dB ripple factor. Special features include an internal oscill ­ator for calibration, a speaker, a headphone jack for aural monitoring, and a built-in battery charger.

A compact metal cabinet 8 inches high, 12 inches wide, and 9 inches deep houses the instrument. Weight, including the battery, is 15 -pounds. The front panel contains all the operating controls and is protected by a metal cover that snaps in place. The POWER switch must be set to the OFF position before the cover can be installed, thereby preventing the possibility of battery discharge while the instrument is not in use.

Most of the circuitry is laid out on printed circuit boards and assembled into six separate modules. Extensive shielding is provided for modules and compon­ents to prevent interaction between circuits.

The POWER switch is used to select either 115 volts, 50-400 Hz, or an internal nickel-cadmium battery as the power source. The battery will operate the instru­ment approximately 35 hours without recharging. The instrument will operate on the lIS-volt ac line source with or without the battery and regardless of battery condition. A polarized three-pin male connector, on the right side of the front panel, provides access for battery charging and operation from the ItS-volt ac source. The instrument may be operated while the battery is charging.

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Table 1. Specifications

NOTE: Except where indicated, specifications apply to all instruments.

CHARACTERISTIC

FREQUENCY RANGE 1 to 1500 Band A: Band B: Band C:

SPECIFICATION

kHz (3 bands) 1 to 310 kHz 300 to 710 kHz 690 to 1500 kHz

SELECT IV ITY

FREQUENCY ACCURACY

MEASUREMENT ACCURACY

SPURIOUS RESPONSE AND INTERMODULATION PRODUCTS

INTERNAL CALIBRATION SOURCE

INTERMEDIATE FREQUENCY

TYPES OF DEMODULATION

TEMPERATURE RANGE

POWER SUPPLY

CURRENT DRAIN

BATTERY LIFE

OVERALL DIMENSIONS

WEIGHT

INPUT LEVEL

100 Hz nominal at 3 dB down 400 Hz maximum at 60 dB down

or 250 Hz nominal at 3 dB down 1100 Hz maximum at 60 dB down

and 2500 Hz nominal at 3 dB down 10,000 Hz maximum at 60 dB down

Dial: Band A ±l kHz Band B ±2 kHz Band C ±3 kHz

Counter: All bands ±20 Hz

±l dB

Greater than 55 db down

250-kHz crystal oscillator

2215 kHz

AM, LSB, and USB

-lOD C to +50 DC

l2-volt nickel-cadmium battery or lIS volts, 50 to 400 Hz, for ac operation and for charging battery

35 ma average

35 hours without recharging

8 in. high x 12 in. wide x 9 in. deep

15 Ib

-100 to +22 dBm (7.75 uV to 10 V)

2 3-72

CHAPTER I GrnEAAL

1. SCOPE.

This manual describes the following RYCQM instruments:

Model 3l2lB Selective Levelmeter Model 3126B Selective Levelmeter Model 3132 Selective Levelmeter

2. DESCRIPTION.

All the instruments are intended for general use where it is desired to measure the level of individual or narrow bands of frequencies. Each can be operated with its internal battery, or from 115 volts, 50 to 400 Hz, which is also used to charge the battery.

Table 1 lists the specifications and figures land 2 show the instruments.

The instruments are all fully transistorized. Each measures voltage from 7.75 microvolts to 10 volts (-100 dBm to +22 dBm) in the frequency range 1 to 1500 kilohertz. Excepting Model 3126B (250 Hz only), each instrument has a 100· or 2s0-Hz bandwidth filter that makes it particularly useful for analyzing closely spaced signals, complex waveforms, determining carrier system levels, and check­ing amplitude modulation percentages. Included is a 2.s-kHz bandwidth filter that has a ±O.S dB ripple factor. Special features include an internal oscill ­ator for calibration, a speaker, a headphone jack for aural monitoring, and a built-in battery charger.

A compact metal cabinet 8 inches high, 12 inches wide, and 9 inches deep houses the instrument. Weight, including the battery, is 15 'pounds. The front panel contains all the operating controls and is protected by a metal cover that snaps in place. The POWER switch must be set to the OFF position before the cover can be installed, thereby preventing the possibility of battery discharge while the instrument is not in use.

Most of the circuitry is laid out on printed circuit boards and assembled into six separate modules. Extensive shielding is provided for modules and compon­ents to prevent interaction between circuits.

The POWER switch is used to select either 115 volts, 50-400 Hz, or an internal nickel-cadmium battery as the power source. The battery will operate the instru­ment approximately 35 hours without recharging. The instrument will operate on the lls-volt ac line source with or without the battery and regardless of battery condition. A polarized three-pin male connector, on the right side of the front panel, provides access for battery charging and operation from the lIS-volt ac source. The instrument may be operated while the battery is charging.

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Table 1. Specifications (Cont)

CHARACTERISTIC

INPUT lMPEDANCE

Model 3l2lB

Model 3l26B

Model 3132

METER INDICATION

Model 3l2lB

Model 3l26B

Model 3132

SPECIFICATION

75-, 135-, 600-ohm terminating or bridge (SK ohms nominal)--unbalanced when operating from 115 Vac

135­ or 600-ohm bridge--ba1anced or unbalanced

135­ or 600-ohm terminating--ba1anced or unbalanced

75, 135, 600 ohms or bridge-­unbalanced

75, 135, 600 ohms or bridge--balanced

DBm on 75-, 135-, and 600-ohm line; volts when calibrated for 600 ohms

DBm on 135­ and 600-ohm line; volts with INPUT SELECTOR switch in 600­ohm position

DBm on 75-, 135-, and 600-ohm line; volts when calibrated for 600 ohms

3-72 3/4

CHAPTER II OPERATION

1. PREPARATION.

The instrument has been thoroughly inspected at the factory and is covered by Warranty. However; before using the instrument. you should inspect it for shipping damage. Report any damage to the carrier and to RYCOM Instruments, Inc.

2. OPERAT ING CONTROLS AND IND ICATORS.

Table 2 lists and describes the instrument controls and indicators.

Table 2. Operating Controls and Indicators

PANEL MARKING

BAND SELECTOR

TUNING

SELECTIVITY

ATTENTUATOR

CAL LEVEL

MONITOR

AUDIO LEVEL

HEADSET

INPUT

DES CR IPT ION

3-position rotary switch

Driven tuning mechanism, 2-speed

2-position rotary switch

ll-position rotary switch

Potentiometer

3-position rotary switch

Potentiometer

Head phone j ac k

Binding posts (also 20-pin connector on Model 3126B)

FUNCTION

Selects frequency band A, B, or C

Tunes instrument to fre­quency indicated on dial face

Selects bandwidth 250 Hz (100 HZ) or 2.5 kHz

Controls sensitivity in la-dB steps up to 100 dB

Adjusts overall gain during calibration

Selects AM or single side­band (LSB, USB) demodula­tion

Adjusts audio level for headset

Provision for audio moni­toring

Signal input for measure­ments

3-72 5

------

Table 2. Operating Controls and Indicators (Cont)

PANEL MARKING

POWER

US VAC

No marking

COUNTER (not on all instru­ments)

INPUT SELECTOR

INPUT SELECTOR

No marking

INPUT SELECTOR

DESCRIPTION

4-position rotary switch, spring loaded in BAT. TEST position

Polarized connector

1/4-in. black knob on FREQUENCY dial bezel

BNC connector

MODEL 3l21B ONLY

5-position rotary switch

MODEL 3l26B ONLY

Ii-position rotary switch

Shorting link on lower two INPUT binding posts

MODEL 3132 ONLY

9-position rotary switch

FUNCTION

Connects power supply to ac line, battery, or battery test circuit

Provision for connection to 115-Vac line

Rotates cursor ±5° for frequency correction

Provision for connection to electronic frequency counter

1. Selects input termina­tions of 75, 135, 600 ohms, or BRIDGE

2. Selects CAL position for calibration

1. Selects input termina­tions of 135- or 600­ohm BRG, 135- or 600­ohm TERM for binding posts, and has three IN and OUT positions for 20­pin connector

2. Selects CAL position for operational calibration -

1. Provides ground for un­balanced measurements when connected

2. Removes ground for bal­anced measurements when disconnected

1. Selects input termina­tions of BRIDGE, 600-, 135-, or 7S-ohm input; BALANCED or UNBALANCED

2. Selects CAL position for operational calibration

3-72 6

3. BATTERY.

The battery will provide up to 35 hours of operation between charges. A com­pletely discharged battery will recharge in 24 hours or less. A routine re­charging schedule should be established, dependent upon instrument use, but the battery should be charged at least ~ per month. (With continuous ac operation, battery charging is unnecessary.)

a. To charge battery, connect instrument to primary power source (115 Vac) and set POWER switch to BAT.

b. To test condition of battery while it is delivering full load current, set POWER switch to BAT. TEST. Battery is fully charged when the meter indicates 0 ±O.S dBm.

4. CALIBRATION.

This procedure checks the main tuning dial and overall sensitivity. Steps not prefixed with a model number apply to all instruments. Perform all steps in the sequence given, omitting steps that are prefixed with model numbers other than that of your instrument.

a. Set INPUT SELECTOR switch to CAL.

b. Set ATTENUATOR switch to CAL -30 DB.

c. Set SELECTIVITY switch to 250 (100) Hz.

d. Set BAND SELECTOR switch to A.

e. Adjust TUNING control for maximum indication on meter. FREQUENCY dial will indicate approximately 250 kHz.

f. Set red cursor on FREQUENCY dial to 250 CAL.

g. Models 3121B and 3132. To calibrate for dBm (600 ohms) and voltage, adjust CAL LEVEL control for dBm indication on meter.

h. Models 3121B and 3132. To calibrate for dBm (135 ohms), perform steps ~

through i except step~. (For step~, set ATTENUATOR switch to -20 DB.) Then adjust CAL LEVEL control for -3.5 dBm indication on meter.

i. Models 3l21B and 3132. To calibrate for dBm (75 ohms), perform steps ~

through i except step~. (For step ~, set ATTENUATOR switch to -20 DB.) Then adjust CAL LEVEL control for -1 dBm indication on meter.

j. Table 3 is a reference chart for calibration of Models 3l21B Bnd 3132.

3-72 7

--

Table 3. Models 3121B and 3132 Calibration

CALIBRATION IMPEDANCE ATTENUATOR

METER INDICATION

600 ohms and volts CAL -30 DB o dBm

135 ohms -20 DB -3.5 dBm (red)

75 ohms -20 DB -1.0 dBm (red)

k. Model 3126B. To calibrate, perform steps a through f and adjust CAL LEVEL control for 0 dBm indication on meter. Th; meter is-now calibrated for voltage and dBm (600 ohms) and dBm (135 ohms). See table 5. Red lines on meter do not apply to Model 3126B.

1. A frequency check can be made by tuning the FREQUENCY dial through its range. Meter indications should be observed at every 250-kHz point; e.g.) 500, 750, 1000, 1250, and 1500 kHz.

5. LINE MEASUREMENTS, MODELS 3121B (UNBALANCED) AND 3132.

(Model 3l21B unbalanced; Model 3132 unbalanced or balanced, depending upon INPUT SELECTOR switch position.)

a. Connect the instrument INPUT to circuit being tested.

b. Calibrate the instrument for source or line impedance according to paragraph 4.

c. Set INPUT SELECTOR switch to desired impedance. See paragraph 7.

d. Set BAND SELECTOR switch and adjust TUNING control to frequency of signal to be measured.

e. Set ATTENUATOR switch sO meter indicates in upper 2/3 of scale.

f. Adjust TUNING control for maximum indication on meter.

g. Read meter indication. See table 4. To obtain the input signal level, algebraically add the meter indication to the ATTENUATOR switch setting.

6. MODEL 3121B LINE MEASUREMENTS--BALANCED.

To make balanced line measurements, perform step ~ or ~.

a. Place the instrument face up (resting on the four rubber feet) and remove the ac line cord from the 115 VAC receptacle. set POWER switch to BAT. position. This places approximately 100 picofarads of unbalance to ground from the ground terminal of the instrument.

8 3-72

b. A balancing transformer, RYCOM Model 3061, can be used. This transformer is optional and can be obtained from RYCOM. See instructions on trans­former for use.

After performing step ~ or~, proceed with measurements described in paragraph 5.

7. INPUT SELECTOR SETTING AND METER CORRECTION, MODELS 3121B AND 3132.

a. INPUT SELECTOR on BRIDGE.

(1) Use this position to connect across a 75-, 135-, or 600-ohro line to make clBm measurements when calibrated for the proper line impedance. For greatest accu~acy, apply the correction factors listed in table 4 for BRIDGE.

(2) Use this position to connect across any low-impedance line to make voltage measurements. Calibrate for 600 ohms according to paragraph 4.£.

b. INPUT SELECTOR on 600 Ohms. Use this position to terminate a 600-ohm line to make dBm (1 mW in 600 ohms) or voltage measurements. Calibrate for 600 ohms according to paragraph 4.£.

c. INPUT SELECTOR on 135 Ohms. Use this position to terminate a 135-ohm line to make dBm (1 mW in 135 ohms) measurements. Calibrate for 135 ohms accord­ing to paragraph 4.h.

d. INPUT SELECTOR on 75 Ohms. Use this position to terminate a 75-ohm line to make clBm (1 mW in 75 ohm ~ measurements. Calibrate for 135 ohms accord­ing to paragraph 4.1.

Table 4. Models 3121B and 3132 INPUT SELECTOR Setting and Meter Correction

INPUT SELECTOR

CALIBRATION IMPEDANCE

METER INDICATION

SOURCE OR LINE IMPEDANCE

METER CORRECT 10 FACTOR

BRIDGE (5000 ohms)

600 ohms TERM

135 ohms TERM

600 ohms

135 ohms

75 ohms

600 ohms

135 ohms

Volts and clBm (600 ohms)

dBm (135 ohms)

dBm (75 ohms)

Volts and dBm

dBm

600 ohms

135 ohms

75 ohms

600 ohms

135 ohms

+0.5 dBm

+0.3 dBm

0

0

0

3-72 9

Table 4. Models 3121B and 3132 INPUT SELECTOR Setting and Meter Correction (Cont)

INPUT SELECTOR

CAL IBRAT ION IMPEDANCE

METER INDICATION

SOURCE OR LINE IMPEDANCE

METER CORRECTION FACTOR

75 ohms TERM

75 ohms dBm 75 ohms a

e. Example: BRIDGE position calibrated for 600 ohms shows meter correction factor of +0.5 dBm. Loading effects of the SODa-ohm voltmeter impedance across 600 ohms gives a meter reading that is 0.5 dBm low due to loading. Therefore, add +O.S dB to the meter reading for precise measurements.

f. The use of improper TERM positions is discouraged due to improper impedance matching and large errors in the meter reading.

8. MODEL 3l26B LINE MEASUREMENTS--INPUT JACKS.

a. Connect instrument INPUT jacks to circuit to be tested. For unbalanced lines, use shorting link. For balanced lines, disconnect shorting link.

b. Calibrate instrument according to paragraph 4.

c. Set INPUT SELECTOR switch to desired impedance.

d. Set BAND SELECTOR switch and adjust TUNING control to frequency of signal to be measured.

e. Set ATTENUATOR switch so meter indicates in upper 2/3 of scale.

f. Adjust TUNING control for maximum indication on meter.

g. Read meter indication. See table 5. To obtain the input signal level, algebraically add the meter indication to the ATTENUATOR switch setting.

9. MODEL 3l26B LINE MEASUREMENTS--20-PIN CONNECTO~.

The 20-pin INPUT connector is provided for bridging onto l35-ohm balanced carrier lines of Western Electric N or ON carrier. To perform l35-ohm carrier line measurements, proceed as follows:

a. Patch instrument to circuit to be tested.

b. Calibrate instrument according to paragraph 4.

c. Set INPUT SELECTOR switch as required for circuit to be measured.

d. Set BAND SELECTOR switch and adjust TUNING control to frequency of signal to be measured.

e. Set ATTEh~ATOR switch so meter indicates in upper 2/3 of scale.

10 3-72

f. Adjust TUNING control for maximum indication on meter.

g. Read meter indication in dBm. To obtain the input signal level, algebrai­cally add meter indication to ATTENUATOR switch setting.

10. INPUT SELECTOR SETTING AND METER CORRECTION, MODEL 3l26B.

The calibration given in paragraph 4.k serves for measurements on both 135­and 600-ohm lines.

a. INPUT SELECTOR on 135 Ohms BRG. Use this position to connect across a 135­ohm line to make dBm (1 mW in 135 ohms) measurements. For precise measure­ments, see meter correction factor in table 5.

b. INPUT SELECTOR on 600 Ohms BRG. Use this position to connect across a 600­ohm line to make dBm (1 mW in 600 ohms) or to connect across ~ny low­impedance line to make voltage measurements. For precise measurements, see meter correction factor in table 5.

c. INPUT SELECTOR on 135 Ohms TERM. Use this position to terminate a l35-ohm line to make dBm (1 mW in 135 ohms) measurements.

d. INPUT SELECTOR on 600 Ohms TERM. Use this position to terminate a 600-ohm line to make dBm (1 mW in 600 ohms) or voltage measurements.

e. INPUT SELECTOR on IN or OUT Positions. Use these positions to connect across the l35-ohm balanced lines of Western Electric N or ON carrier to make dBm (1 mW in 135 ohms) measurements. (See paragraph 9.)

Table 5. Model 3l26B INPUT SELECTOR Setting and Meter Correction

INPUT SELECTOR

135 ohms TERM

135 ohms BRG

600 ohms BRG

600 ohms TERM

CALIBRATION IMPEDANCE

*600 ohms

*600 ohms

*600 ohms

*600 ohms

METER INDICATION

DBm from l35-ohm source

DBm from l35-ohm source

Volts from any low impedance source and dBm from 600-ohm source

Volts or dBm from 600­ohm source

*This is equivalent to 600 ohms calibration impedance but not selectable in Model 3l26B. The example given 7.~ applies to Model 3l26B also.

METER CORRECTION FACTOR

o

+0.3 dBm

+0.5 dBm

o

in other units in paragraph

3-72 11

11. MONITORING.

Provision is made for monitoring audio signals that may be present on line signals under measurement. To monitor signals, set SELECTIVITY switch to 2.5 KHz, set MONITOR switch to desired position (AM, LSB, or USB), and adjust AUDIO LEVEL control to the desired audio level.

12. COUNTER OUTPUT.

The counter is normally supplied with 100-Hz instruments.

a. Using a short length of coaxial cable, connect the instrument COUNTER out­put jack to the input of a frequency counter with the following minimum characteristics:

Sensitivity: 0.1 V Input Impedance: 10,000 ohms

NOTE

If the frequency counter has variable gate and display times, proceed-with steps band £.

b. Using Counter to Replace Instrument FREQUENCY Dial.

(1) Set counter GATE TIME to 0.01 second.

(2) If counter has MEMORY control, turn it on.

(3) Adjust counter DISPLAY control for minimum display time.

(4) Counter indicates frequency setting of the instrument ±100 Hz.

c. Using Counter as a Tuned-to-Freguency Readout.

(1) Carefully adjust TUNING control so meter indicates maximum (peaked).

(2) Set frequency counter GATE TIME to 0.1 second.

(3) Adjust frequency counter DISPLAY control for a display time as short as possible but easily readable.

(4) With a laO-Hz filter in the instrument, the frequency counter indi­cates the frequency to which the instrument is tuned ±20 Hz.

d. A counter with fixed l-second gate time can also be used. Tuning to and measuring a frequency is a little slower but just as accurate.

12 3~72

CHAPTER III THEORY OF OPERATION

1. GENERAL.

The instrument employs a single conversion superheterodyne circuit with a selectable bandpass of 250 (100) Hz or 2.5 kHz to measure frequencies in the range 1 to 1500 kHz. Figure 11 is a functional block diagram of the instru­ment and figure 12 is the basic schematic diagram without the counter output module. Figures l2A, l2B, and l2C show the different input circuits of the three models. Figure 13 is a schematic diagram of the counter output module.

At the input of the instrument, a switch is used to select the input signal from either the 250-kHz calibrate oscillator or from the front panel INPUT jacks. A filter and matching network are incorporated into the input circuit to attenuate unwanted high-frequency components and to provide proper imped­ances.

A variable attenuator provides up to 100 dB of attenuation in 10-dB steps tc control sensitivity of the instrument. Tuning of the instrument is accomplished by a variable local oscillator whose output varies from 2216 to 3715 kHz. The input and local oscillator signals are heterodyned in a mixer to produce a 22l5-kHz difference frequency. The i-f amplifier is tuned to 2215 kHz and it amplifies the mixer output.

The 250 (lOO)-Hz and 2.S-kHz selectivities of the instrument are determined by crystal filters between the first and second i-f amplifiers. After amplifi ­cation by the i-f amplifier, the signal is rectified and filtered in a meter detector circuit and then applied to a meter.

The second detector, when used with insertion frequency of 2213.5 kHz and 2216.5 kHz will produce single sideband demodulation for audio monitoring.

The calibrate oscillator generates a 250-kHz square wave and is amplitude­regulated to provide an output level that is equivalent to -30 dBm at the INPUT jacks. Before measurements are made, the instrument sensitivity is calibrated by connecting the calibrate oscillator output to the instrument input circuits and adjusting the i-f amplifier gain for a meter indication of o dBm.

When the instrument is used for power measurements, the variable attenuator is used to change sensitivity in calibrated steps of 10 dB. For example, assume that a signal level of -42 dBm is applied to the instrument input. Adjusting the ATTENUATOR to the -40 DB position will result in meter indication of -2 dBm. The input level is then determined by algebraically adding the meter indication to the attenuator setting;

-40 dB + (-2 dBm) -42 dBm

3-72 13

2.

3.

4.

5.

6.

INPUT MODULE AI.

The input circuits are composed of INPUT SELECTOR switch Sl and a 100-dB ATTENUATOR AIATI. Input signals are applied to INPUT binding posts AIEl and AlE2. All models have 5000 ohms input impedance.

In Models 3l2lB and 3132, resistor AlRl, AlR2, or AIR3 is switched into the circuit by AISI to terminate 75-, 135-, or 600-ohm lines. In Model 3l26B, resistor AIR2 or AIR3 is switched into the circuit by AISI to terminate 135­or 600-ohm lines.

In Model 3l26B, resistors AIR4 and AIRS form a 6.S-dB L-pad, and are sWitched into the circuit in INPUT SELECTOR positions 600 Ohms BRG or 600 Ohms TERM for measurements on 600-ohm impedance lines. This allows one calibration to serve for both 135-ohm and 600-ohm dBm measurements.

EMITTER-FOLLOWER AND CALIBRATE OSCILLATOR MODULE A2.

The function of the emitter-follower with feedback is to match attenuator AlATI to lowpass filter FL3.

The calibrate oscillator is 250 kHZ, crystal-controlled, and biased so the out­put voltage swings between the regulated -power supply voltage and ground. The output is applied through CAL OSC ADJ potentiometer A2Rl2 to switch AISI for calibrating the instrument level and checking the frequency dial accuracy.

LOWPASS FILTER FL3.

The lowpass filter has a cutoff frequency of 1760 kHz and provides 60 dB of attenuation at 2215 kHz. Input and output impedances are 150 ohms.

OSC ILLATOR-MODULATOR MODULE A3.

The input signal is heterodyned with the local oscillator injection signal in balanced modulator diodes A3CRI. The diodes operate as a balanced shunt modu­lator, shorting the signal to ground during one-half the local oscillator cycle. The 2215-kHz output of the modulator is capacitively coupled to the base of first i-f amplifier A4Ql.

Modulator driver A3Q1 output is transformer-coupled through A3Tl to the modu­lator diodes. Local oscillator level at the junction of the modulator diodes is very small due to the matching of components. Input to the modulator driver is capacitively coupled from the emitter of local oscillator A3Q2.

The local oscillator is a modified Colpitts type with three switched frequency bands. The frequency in each band is varied by adjusting TUNING capacitor CI, an 11- to 150-picofarad air-dielectric capacitor. The oscillator circuit is temperature-stabilized by A3CB.

IF AMPLIFIER MODULE A4.

The 2215-kHz output of the modulator is capacitively coupled to first i-f amplifier A4Ql. The amplifier and filter driver consists of three stages:

14 3-72

A4Ql, A4Q2, and A4Q3. Total gain is 36 dB. Output of A4Q2 is transformer coupled to A4Q3, the filter driver.

The instrument has two crystal filters which are selected by SELECTIVITY switch A4S4. The center frequency of both filters is 2215 kHz and the bandwidths are 250(100)Hz (A4FLl) and 2.5 kHz (A4FL2) at 3 dB down. Trimmer capacitors A4C7 through A4ClO tune the filters for maximum flatness. Each filter has an input impedance of 4000 ohms and an output impedance of 1000 ohms.

The filter matching amplifier and second i-f amplifier consists of three stages: A4Q4, A4Q5, and A4Q6. Output of the crystal filter is capacitively coupled to filter matching amplifier A4Q4-A4Q5. CAL LEVEL control R2 is used to adjust bias current for A4Q5, thus controlling gain of the stage. The output of A4QS drives common-emitter amplifier A4Q6. Second i-f amplifier A4Q6 has a gain of 20 to 40 dB, depending upon the setting of CAL LEVEL control R2.

Third i-f amplifier A4Q7 provides 30 dB of gain and is transformer-coupled to i-f output amplifier A4Q8. Output of A4Q7 is also capacitively coupled to the meter detector circuit.

Meter detector diode A4cRl is a half-wave detector with its output applied through A4R27 to power switch S7, which is connected to the meter.

I-f output amplifier A4Q8 provides isolation of the carrier reinsertion oscillator signal and also drives demodulator diodes ASCR2 and ASCR3.

7. DEMODULATOR MODULE AS.

The AM demodulator is a shunt type; AsCR3 is the diode. Monitor switch A5Ss, when in the AM position, connects, the cathode of AsCR3 to ground. Rf filtering is done by A5ClO and AsRls. The audio signal is capacitively coupled from AUDIO LEVEL control Rl to the base of first audio amplifier ASQ5.

The sideband demodulator consists of AsCR2 and AsCR3, which are supplied with carrier signal from ASQ4. These diodes operate as a balanced shunt demodulator that shorts the i-f signal to ground during one-half the injection signal cycle. This produces an audio difference signal that is coupled to the base of first audio amplifier AsQs.

Carrier reinsertion oscillator AsQ3 is crystal-controlled by AsYI or AsY2. Output is capacitively coupled to balanced phase splitter AsQ4, which supplies out-of-phase signals to demodulator diodes AsCR2 and ASCR3. MONITOR switch ASSS is used to apply power to AsQ3 and AsQ4, and select the crystal for LSB or USB demodulation. LSB crystal AsYI is 1.5 kHz below and USB crystal ASY2 is 1.5 kHz above the i-f center of 2215 kHz.

8 • ADD 10 AMPL IF IER MODUL E AS.

The audio amplifier is composed of first audio amplifier ASQs and audio output amplifier AsICl, an integrated circuit. The output of the demodulator is fed through rf decoupling network AsRls and AsClO to AUDIO LEVEL control Ri. Sig­nal at the arm of Rl drives first audio amplifier AsQs. Gain of audio output amplifier ASICI is approximately 28 dB.

3-72 15

9. REGULATOR MODULE AS.

The regulator is a series type, with A5Ql as the series regulator transistor and A5Q2 the control amplifier. Reference diode A5VRl (9.1 volts) controls bias for A5Q2. The output of the regulator is also connected through A5R4 to POWER switch 87 for checking battery condition. Nickel-cadmium batteries hold their full voltage throughout the useful life of the charge, thus a meter indication of a ±O.5 dBm indicates that the battery charge is adequate for instrument operation.

10. AC POWER SUPPLY AND CHARGER MODULE A6.

The ac power supply consists of Tl, A6CR1, A6Cl, A6Rl, and A6VRl. Voltage applied to the regulator and to the audio amplifiers on module AS is preregulated by A6VRl. The ac power supply also supplies charging current of approximately 65 milliamperes to the battery when POWER switch 87 is in the BAT. position. When the POWER switch is in the AC position, A6R2 is connected in series with the battery to supply a trickle charge of approximately 5 milliamperes and isolate the battery from the preregulated line.

11. COUNTER OUTPUT MODULE A7.

Module A7 is usually installed in instruments with lOa-Hz selectivity but it can be ordered with 250-Hz instruments. The purpose of the module is to provide an output signal for accurate frequency measurements by an external electronic frequency counter.

Figure 13 is the schematic diagram of the counter module.

A signal from local oscillator module A3 is connected through coaxial cable to El of module A7. The signal goes through isolation amplifiers A7Ql and A7Q2 to pin 1 of product detector A7ICl. Transistor A7Q5 and associated components form a crystal-controlled oscillator that is adjustable over the i-f of 2215 kHz. The output of this injection oscillator is coupled to pin 2 of A7ICI.

The output at pin 8 of A7lCl is the product of the local oscillator and the injection oscillator outputs, and is applied to lowpass filter A7L2-A7L3. Only the difference frequency is passed and applied to amplifier A7Q3. Tran­sistor A7Q4 provides a low output impedance through A7C12 to COUNTER output connector J3 on the front panel of the instrument.

Counter output signal accuracy depends upon the accuracy of centering within the bandpass of the lOO-Hz filter.

16 3-72

L

CHAPTER IV MAINTENANCE

INTRODUCTION.

This instrument will give comparatively trouble-free performance provided normal operating procedures are observed. In the event of any malfunction, first check the battery by turning the POWER switch to the BAT. position and observing the meter for an indication of 0 ±O.5 dB.

Before attempting to trouble shoot the instrument, you should study Chapter III, Theory of Operation. The trouble-shooting procedure consists of three parts:

Isolation to a particular module Module trouble shooting Transistor voltage checks

2. TEST EQUIPMENT.

The test equipment of table 6 is required to test and align the instrument, but it is not supplied.

Table 6. Test Equipment

NAME USE REQUIRED CHARACTERISTICS

Sweep Generator and Display Unit

Vtvm

Frequency Counter

Signal Generator

Ac Vtvm

Align i-f amplifiers and crystal filters

1. Center frequency between 50 and 500 kHz

2. Sweep width variable from 5 to 40 kHz

3. Sweep rate: l/sec. to 4/sec.

Triplett 850 or equivalent

L Minimum counting rate 3000 kHz

2. Gate time 1 sec. and 0.01 sec.

3. Variable display time

Hewlett-Packard 651 or equivalent

Ballantine 303 or equivalent

3-72 17

3. TROUBLE SHOOTING.

Before proceeding with step 1 in table 7, connect equipment in the test setup shown in figure 3 and perform the following steps:

a. Set instrument switches and controls as follows:

Swi tch/Control Position

INPUT SELECTOR BRIDGE BAND SELECTOR A TUNING 250 kHz ATTENUATOR -60 DB CAL LEVEL Fully clockwise SELECTIVITY 2.5 kHz

b. Adjust signal generator for 0.78~V, 250-kHz output signal.

SIGNAL GENERATOR

RYCOM AC VTVM INSTRUMENT

Figure 3 Test Setup for Module Isolation

Table 7. Module Isolation

STEP

1

2

3

PROCEDURE

Turn unit on. Activate BAT. TEST.

Set INPUT SELECTOR to BRIDGE. Connect ac vtvm to pin 7 of Module A2.

Set INPUT SELECTOR to CAL. Connect ac vtvm to pin 7 on Module A2.

NORMAL INDICATION

Meter reads o ±0.5 dB.

Ac vtvm indicates 77 mV.

Ac vtvm indicates 2.5 mV.

IF IND ICATION IS ABNORMAL

Battery needs recharge or power supply regulator Module AS. See table 8.

Trouble is in input Module AI. See table 10.

Trouble is in calibrate oscillator on Module A2. See table 12.

18 3-72

Table 7. Module Isolation (Cont)

STEP PROCEDURE NORMAL

INDICATION IF IND ICAT ION

IS ABNORMAL

4 Set INPUT SELECTOR to BRIDGE. Connect ac vtvm to pin 1 on Mod­ule A2.

Ac vtvrn 34 mV.

indicates Trouble is in emitter­follower on Module A2. See table 11.

5 Connect ae vtvm to pin E2 on Module M.

Ac vtvrn 30 mV.

indicates Trouble is in FL3 lowpass filter. See table 13.

6 Set BAND SELECTOR to A. Tune dial to zero frequency.

Instrument meter indicates past full scale.

Trouble is in Module A3. See table 14.

7 Tune dial to 250 kHz and obtain 0 dB meter reading. Set ATTEN­UATOR to +10 DB. Connect ac vtvm to E6 on Module A4.

Ac vtvrn 0.15 V.

indicates Trouble is in Module A4. See table 15.

8 Connect ac vtvrn to ElO on Module A5. Set MONITOR switch to LSB; AUDIO LEVEL to 2/3 cwo

Ac vtvrn indicates 0.14 V.

Trouble is in reinsertion oscillator Module AS. See table 16.

9 Connect ac vtvrn on Module AS.

to E12 Ac vtvrn approx.

indicates 4 V.

I Trouble is in audio amp­lifier Module AS. See table 17.

Table 8. Regulator Module A5 Trouble Shooting

STEP PROCEDURE NORMAL

INDICATION IF INDICATION

IS ABNORMAL

1

2

Connect vtvm to El on Module A5.

Connect vtvm to El on Module AS. Set POWER switch to BAT.

Vtvm indicates 11.5 to 13.5 Vdc.

Vtvm indicates 11.5 to 13.5 Vdc.

Check battery connections. Battery needs rech arging.

Check switch S7 and connections.

3-72 19

Table 8. Regulator Module A5 Trouble Shooting (Cont)

STEP PROCEDURE NORMAL

INDICATION IF IND ICAT ION

IS ABNORMAL

3 Connect vtvm to E7 on Module AS. Set POWER switch to BAT.

Vtvm indicates 9.1 Vdc.

Check A5Ql and A5Q2 volt ­ages. See table 18.

Table 9. Power Supply and Charging Circuit Module A6 Trouble Shooting

STEP PROCEDURE NORMAL

IiIDICATION IF INDICATION

IS ABNORMAL

1 Connect vtvm to cathode of A6VR1. Connect power cord to 115 Vac. Set POWER switch to AC.

Vtvm indicates 13.5 to 16.5 Vdc.

Check A6CR1, A6Cl, A6Rl and A6VRl.

Table 10. Input Module Al Trouble Shooting

STEP PROCEDURE NoRMAL

INDICATION IF INDICATION

IS ABNORMAL

1

2

Set INPUT SELECTOR to BRIDGE. Connect ae vtvm to coaxial lead from SI to ATI on Module AI. Set ATTEN­UATOR to -80 DB.

Set INPUT SELECTOR to BRIDGE. Connect BC vtvm to pin 7 on Module

-A2. Set ATTENUATOR to -80 DB.

Ac vtvm indicates 0.78 V.

Ac vtvm indicates 0.78 V.

Check AlCI and switch AISI connections for continuity.

Check AlS2.

20 3-72

STEP

1

STEP

1

2

Table 11. Bmitter-Fo110wer Module A2 Trouble Shooting

PROCEDURE

Set signal generator to 250 kHz at -30 dBm and connect to pin 7 of Module A2. Connect ac vtvm to pin 1.

STEP PROCEDURE

1 Set INPUT SELECTOR to CAL. Connect ac vtvrn to pin 4 on Module A2.

NORMAL INDICATION

IF INDICATION IS ABNORMAL

Ac vtvrn 11 mV.

indicates Check A2Q1, A2Q3, and A2Q4 voltages. See table 18.

Table 12. Calibrate Oscillator Module A2

NORMAL INDICATION

Ac vtvm indicates 26 mV.

Trouble Shooting

IF INDICATION IS ABNORMAL

Check A2Q2 voltages. See table 18.

Table 13. Lowpass Filter FL3 Trouble Shooting

PROCEDURE

Set signal generator to 250 kHz at 24.5 mV and connect to IN on FL3. Connect ac vtvm to OUT on FL3.

Connect ohmmeter from pin IN to OUT on FL3.

NORMAL INDICATION

Ac vtvrn indicates 22 mV.

IF INDICATION IS ABNORMAL

Check continuity of FL3.

Ohnmeter indicates Trouble is in FL3. 2 ohms. .

I

21 3-72

Table 14. Local Oscillator Module A3 Trouble Shooting

STEP PROCEDURE NORMAL

INDICATION IF IND ICAT ION

IS ABNORMAL

1

2

Connect ae vtvm to junction of A3Rl and A3CRl.

Connect ac vtvm to junction of A3R5 and A3R6.

Ac vtvm indicates 0.55 V.

Ac vtvm indicates between 0.15 and 0.3 v.

Check A3Ql and A3Q2 voltages. See table 18.

Check A3Q2 voltages. See table 18.

Table 15. I-f Amplifier Module A4 Trouble Shooting

STEP PROCEDURE NORMAL

INDICATION IF u\TDICATION

IS ABNORMAL

1 Set signal generator to 2215 kHz at -100 dB (7.75 uV) and connect to E2 on Module A4. Rotate CAL LEVEL fully cwo Set SELECTIVITY to 2.5 kHz.

Instrument 'indi­cates -6 dBm.

Adjust A4T1, A4T2, and A4T3 for maximum indi­cation on meter. Check A4Ql thru A4Q8 volt ­ages. See table 18.

Table 16. Reinsertion Oscillator Module AS Trouble Shooting

STEP PROCEDURE NORMAL

INDICATION IF INDICATION

IS ABNORMAL

1 Set MONITOR to LSB. Connect ac vtvm to base of ASQ4.

Ac vtvm indicates 0.75 V.

Check A5Q3 voltages. See table 18. Check crystals.

2 Connect ac vtvm to junction of A5C8 and A5R13.

Ac vtvm indicates 0.5 V.

Check A5Q4 voltages. See table 18.

--..

22 3-72

Table 17. Audio Amplifier Module AS Trouble Shooting

STEP PROCEDURE NORMAL INDICATION

IF INDICATION IS ABNORMAL

1

2

Set signal generator to 1 kHz at 20 mV and connect to E10 on Mod­ule AS. Rotate AUDIO LEVEL control Rl fully cwo Connect ac vtvm to collector of ASQ5.

Connect ac vtvm to E12 on Module AS.

Ac vtvm indicates 150 mV.

Ac vtvm indicates 4 v.

Check ASQ5 voltages. See table 18.

Check ASICl voltages. See table 19.

Table 18. Transistor Voltage Chart

Set instrument controls:

1. No signal input 2. CAL LEVEL fully cw 3. MONITOR to LSB 4. INPUT SELECTOR to CAL

Readings taken with vtvm and should be ±10%. All voltages positive with respect to chassis ground.

TRANSISTORMODULE EMITTER BASE COLLECTOR

A2 Q2 2.3 2.1 6.0 Q3 9.0 7.8 1. 70 Q4 1.1 1.70 9.0 Ql Source = 1.1 Gate = 0 Drain = 8.4

A3 Ql 1.85 2.3 6.8 Q2 1.6 2.0 8.0

Ql 3.3 3.9 9.5 Q2 2.6 3.3 9.5 Q3 1.35 2.0 4.6 Q4 1.9 2.5 9.0 Q5 1.2 1.9 3.6 Q6 2.2 2.8 8.9 Q7 0.9 1.5 C.8 Q8 1.5 2.2 5.0

A4

3-72 23

Table 18. Transistor Voltage Chart (Cont)

MODULE TRANSISTOR EMITTER BASE COLLECTOR

A5 Ql Q2 Q3 Q4 Q5

9.5 0 1.3 1.7 0.4

10.3 0.65 1.5 2.0 1.-0

12.0 10.3 3.5 7.8 5.0

1 A7 Ql

Q2 Q3 Q4 Q5

La 0.4 0.46 5.6 5.8

1.66 La La 6.22 5.5

9.47 9.47 6.22 8.74 9.4

Table 19. Integrated Circuit Voltages

INTEGRATED CIRCUIT

PINS 1 2 3 4 5 6 7 8 12 14

Test conditions are same as those given in table 18.

A5ICl - - 7.0 - - - 6.0 - 1.3 1.3

A7ICl 4.2 1.45 - 0.75 4.2 9.47 4.2 8.98 - -

4. ALIGNMENT.

a. Calibrate Oscillator. Due to normal aging, or replacement of parts, it may be necessary to calibrate the levelmeter. This is accomplished by comparing the calibrate oscillator output level with a known external source. Connect the equipment as shown in figure 4, then proceed with steps (1) through (§j.

FREQUENCY SIGNAL RYCOM GENERATOR VTVMCOUNTER INSTRUMENT

Figure 4 Test Setup for Level Calibration

24 3-72

(1) Set instrument switches and controls:

SWitch/Control Position

INPUT SELECTOR BRIDGE SELECTIVITY 250(lOO)Hz ATTENUATOR CAL -30 DB BAND SELECTOR A TUNING 250 kHz CAL on

FREQUENCY dial

(2) Adjust signal generator frequency to 2S0 kHz.

(3) Adjust signal generator output level to -30 dBm (24.5 mV).

(4) Adjust TUNING control for maximum indication on meter.

(5) Adjust CAL LEVEL for 0 dBm indication on meter.

(6) Set INPUT SELECTOR to CAL.

(7) Adjust TUNING control for maximum indication on meter.

(8) Adjust CAL OSC ADJ control A2R12 on Module A2 for 0 dBm indication on meter. The instrument is now calibrated and ready for operation.

b. I-f Amplifier. The alignment of the 22l5-kHz i-f amplifier, Module A4, is performed by using the internal 2S0-kHz calibrate oscillator as a signal source. Proceed as follows:

(1) Set instrument switches and controls:

Switch/Control Position

INPUT SELECTOR CAL ATTENUATOR CAL -30 DB SELECTIVITY 250(lOO)Hz BAND SELECTOR A TUNING Adjust for maximum

meter indication

NOTE

Module A4 cover must be in place before aligning.

(2) Adjust CAL LEVEL (and A4R5 if needed) so meter indicates in upper one-half of scale.

(3) Adjust A4Tl, A4T2, and A4T3 with a nonmetallic tuning tool for max­imum meter indication.

3-72 25

(4) Adjust CAL LEVEL fully counterclockwise (minimum gain), then adjust A4R5 for -2 dB meter indication.

(5) Check gain range by rotating CAL LEVEL to extreme clockwise position (maximum gain). Meter should indicate approximately +1.5 dB with ATTENUATOR switch set to -20 DB.

c. Crystal Filters A4FLl and A4FL2. Crystal filters A4FLl and A4FL2 on Module A4 can be adjusted for passband flatness by using the internal calibrate oscillator. Proceed as follows:

(1) Set instrument switches and controls:

Switch/Control Position

INPUT SELECTOR CAL ATTENUATOR CAL -30 DB SELECTIVITY 2.5 kHz BAND SELECTOR A TUNING 250 kHz CAL on

FREQUENCY dial

(2) Adjust TUNING so meter indicates in valley of passband ripple.

(3) Adjust A4C9 and A4C10 for maximum meter indication.

(4) Repeats steps ~) and (1) until filter A4FL2 passband ripple is within ±0.5 dB.

(5) Set SELECTIVITY to 250(100)Hz.

(6) Adjust TUNING so meter indicates in valley of passband ripple.

(7) Adjust A4C7 and A4C8 for maximum meter indication.

(8) Repeat steps (~) and (l) until filter A4FLl passband ripple is within ±O.5 dB.

d. Local Oscillator.

(1) Connect equipment as shown in figure 5.

(2) Adjust equipment as follows:

Switch/Control Position

SIGNAL GENERATOR o dBm level output INPUT SELECTOR BRIDGE ATTENUATOR o DB SELECTIVITY 250(lOO)Hz FREQUENCY dial Align with notch in top of red cursor FREQUENCY dial bezel

opening

26 3-72

FREQUENCY COUNTER

~ I\ I

SIGNAL RYCOM GENERATOR INSTRUMENT

X r

Figure 5 Test Setup fot' Frequency Alignment

(3) Band A Alignment.

(a) Set BAND SELECTOR to A.

(b) Adjust signal generator frequency to 50 kHz.

(c) Adjust TUNING for 50-kHz indication on FREQUENCY diat.

(d) Adjust A3L3 for maximum meter indication.

(e) Adjust signal generator frequency to 250 kHz.

(f) Adjust TUNING for 250-kHz indication on FREQUENCY dial.

(g) Adjust A3C14 for maximum meter indication.

(h) Repeat steps (£) through (a) until FREQUENCY dial tracks within ±l kHz on band A.

(4 ) Band B Alignment.

(a) Set BAND SELECTOR to B.

(b) Adjust signal generator frequency to 350 kHz.

(c) Adjust TUNING for 350-kHz indication on FREQUENCY dial.

(d) Adjust A3C16 for maximum meter indication.

(e) Adjust signal generator frequency to 650 .kHz.

(f) Adjust TUNING for 650-kHz indication on FREQUENCY diaL

(g) Ad just A3C12 for maximum meter indication.

(h) Repeat steps (!?) through (a) until FREQUENCY dial tracks within ±2 kHz on band B.

(5 ) Band C Alignment.

(a) Set BAND SELECTOR to C.

(b) Adjust signal generator frequency to 1400 kHz.

3-72 27

(c) Adjust TUNING for 1400-kHz indication on FREQUENCY dial.

(d) Adjust A3CIO for maximum meter indication.

e. Counter Output. Bands A, B, and C must be aligned according to paragraph4.i before the counter output module can be aligned.

(1) Very carefully center the signal in the bandpass of the 100-Hz crystal filter by adjusting signal generator frequency for peak indication on the meter. Note frequency counter indication.

(2) Remove cover from counter Module A7.

(3) Connect frequency counter to COUNTER jack.

(4) Carefully adjust A7Cl3 in counter module for the same frequency as noted in step (l). Frequency should be within ±20 Hz of that noted.

(5) Replace cover on counter module.

28 3-72

1.

2.

01121

01295

03508

03877

04713

CHAPTER V PARTS LIST

HOW TO ORDER pARTS.

When ordering parts, always include:

a. Name, model, and serial number of the instrument. b. Module and reference designation. c. Part number. d. Description.

Order parts from:

RYCCM INSTRUMENTS 9351 East 59th Street Raytown, Missouri 64133

Telephone 816-353-2100

NOTE: $10.00 minimum on all orders.

LIST OF MANUFACTURERS.

Code is listed in parts list under MFR.

Name and Address Code Name and Address

Allen-Bradley Co. 05397 Union Carbide Corp., Lind Div. 1201 S. 2nd St. Kemet Dept. Milwaukee, Wise. 53204 Cleveland, Ohio

Texas Instruments, Inc. 06978 Alladin Electronics Semiconductor-Components Div. of Alladin Ind.

Div. 705 Murfreesboro Rd. 13500 N. Central Expressway Nashville, Tenn. 37210 Dallas, Tex. 75231

07109 Oaktron Industries General Electric Co. P. O. Box 86 Semi-Conductor Products Monroe, Wise. 53566

Dept. Electronics Park 07910 Continental Divice Corp. Syracuse, N.Y. 13201 12515 Chad'ron Ave.

Hawthorne, Calif. 90250 Transitron Electronic Corp. 168-186 Albion St. 11236 CTS of Herne, Inc. Wakefield, Mass. 01880 406 Parr Rd.

Berne, Ind. 46711 Motorola Semiconductor

Products, Inc. 11237 CTS Keene, Inc. 5005 E. McDowell Rd. 3230 Riverside Ave. Phoenix, Ariz. 85005 Paso Robles, Calif. 93446

3-72 29

Code

13571

14752

16299

18410

24655

29309

34263

44655

49956

56289

70903

71400

Name and Address

Electronic Research Corp. 10005 W. 75th Overland Park, Kans. 66204

Electro Cube, Inc. 1710 S. Del Mar Ave. San Gabriel, Calif. 91776

Corning Glass Works Electronic Components Div. 3900 Electronics Dr. Raleigh, N.C. 27604

RYCOM INSTRUMENTS RAILWAY COMMUNICATIONS,INC. 9351 E. 59th St. Raytown, Mo. 64133

General Radio Co. 22 Baker Ave. West Concord, Mass. 01781

Richey Electronics, Inc. 1307 Dickerson Rd. Nashville, Tenn. 37213

CTS of Brownsville, Inc. 1100 Roosevelt St. Brownsville, Tex. 78520

Ohmite Mfg. Co. 3601 W. Howard St. Skokie, Ill. 60076

Raytheon Co. Lexington, Mass. 02173

Sprague Electric Co. North Adams, Mass. 01247

Beldon Corp. 415 S. Kilpatrick Chicago, Ill. 60644

Bussmann Mfg. Div. of McGraw Edison 2536 W. University St. St. Louis, Mo. 63017

Code

71785

72136

72982

74970

79089

81073

82389

84411

87930

91637

95712

99848

Name and Address

Cinch Mfg. Co. and Howard B. Jones Div.

1026 S. Homan Ave. Chicago, Ill. 60624

Electro Motive Mfg. Co., Inc. South Park and John Streets Willimantic, Conn. 06226

Erie Technological Products, Inc.

644 W. 12th St. Erie, Pa. 16512

E. F. Johnson Co. 299 10th Ave. S. W. Waseca, Minn. 56093

RCA Corp, Receiving Tube Div. 415 S. 5th St. Harrison, N. J. 07029

Grayhill, Inc. 561 Hillgrove Ave. La Grange, Ill. 60525

Switchcraft, Inc. 5555 N. Elston Ave. Chicago, Ill. 60630

TRW Capacitor Div. 112 W. First St. Ogallala, Nebr. 69153

Tower Mfg. Corp. 158 Pine St. Providence, R.I. 02903

Dale Electronics, Inc. P. O. Box 609 Columbus, Nebr. 68601

The Bendix Corp., Microwave Devices Div.

Hurricane Rd. Franklin, Ind. 46131

Wilco Corp. 4030 W. 10th St. P. O. Box 22248 Indianapolis, Ind. 46222

30 3-72

PARTS LIST

1

111

11

1

111

1

1

1

QTY/REF DES DESCRIPTION PART NO. MFR ASSY

PARTS LOCATED ON FRONT PANEL OR CHASSIS

BTl Battery, 12 V, 1.0 amp-hr, nickel-cadmium 41B001KD20 18410

C1 Cap, var, air, 11-150 pF, type L 167-153 ..10 18410 1

FL3 Filter, lowpass, 1.76 MHz cutoff 3121FL3 18410 1 frequency, 150 ohms input and output impedance

J1 Connector, electrical power H1061-IG 87930 J2 Jack, headset L-12A 82389 J3 95712Connector, BNC (used with Module A7) 4716-1

3121LlA 18410 L2 Ll Coil, rf, 15.6 uH

Suppressor, parasitic 3131L2 18410

LS1 Loudspeaker 3A1415 07109

M1 Mu1timeter, replacement, 0-200 uA, 3005-41 18410 1 500 ohms dc resistance

R1 Res, var, 25K ±20%, 1/2 W WM4275A 11237 R2 Res, var, 10K ±20%, 1/2 W NW8746 11237 R3 Res, 47 ohms ±5%, 1/2 W, carbon EB4705 01121

S7 SWitch, rotary, 3-po1e, 4-pos, 1-deck 184103131S7

T1 Transformer, power 3085-1 18410

WA1 Cord Assy, power 17258S 70903

3-72 31

PARTS LIST

REF DES DESCRIPTION PART NO. MFR QTY/ ASSY

MODULE Al (MODEL 3121B)

AIel A1e2

Cap, Cap,

5.0 uF 0.1 uF

±20%, 200 wvdc, mylar (-20% +80%), 25 wvdc, ceramic

X663FSOS02W S81S000YSUOO 1042

84411 72982

1 1

AIEl A1E2

Binding Post, Binding Post,

red black

29-1-R 29-1-B

81073 81073

1 1

Mounting Plate, black 29Bll-1 81073 1

A1R1 A1R2

A1RJ

AlR4 A1R5 AIR6 AlR7

AIR8

AIR9

AIRlO

A1R11

A1R12

A1R13

A1Rl4

AIR15 A1R16

A1R17 A1R18

A1R19

Res, 75 ohms ±5%, 2 W, metal film Res, 140 ohms ±2%, 1 W at 125°C, metal

film Res, 681 ohms ±1%, 1/4 W at 125°C,

metal film NOT USED NOT USED NOT USED Res, 6040 ohms ±l%, 1/10 W at 12SoC,

metal film Res, 3400 ohms ±1%, 1/10 W at 125°C,

metal film Res, 1580 ohms ±1%, 1/10 W at 125°C,

metal film Res, 4S30 ohms ±1%, 1/10 W at 12SoC,

metal film Res, 499 ohms ±1%, 1/10 W at 12SoC,

metal film Res, 4990 ohms ±1%, 1/10 W at 125°C,

metal film Res, 4870 ohms ±1%, 1/10 W at 12SoC,

metal film Res, 158 ohms ±1%, 1/10 W at 125°C,

metal film Res, 4990 ohms, same as A1R12 Res, 49.9 ohms ±1%, 1/10 W at 12SoC,

metal film Res, 4990 ohms, same as A1R12 Res, 15.8 ohms ±1%, 1/10 W at 12SoC,

metal film Res, lS.8 ohms, same as A1R18

Type c-42S Type C-32

RY6SD6810F

RYS 7D6041F

RYS7D3401F

RYS 7DtS81F

RYS7D4S31F

RYS7D4990F

RYS 7D4991F

RYS 7D4871F

RYS7D1S80F

RYS7D49R9F

RYS7D1SR8F

16299 16299

18410

18410

18410

18410

18410

18410

18410

18410

18410

18410

18410

1 1

1

1

1

1

1

1

3

1

1

1

2

A1S1 A1S2

Switch, Switch,

rotary rotary

3121S1A 3121S2

18410 18410

1 1

3-7232

PARTS LIST

REF DES DESCRIPTION PART NO. MFR QTY./ ASSY

MODULE Al (MODEL 3126B)

AICI AIC2

AIC3

Cap, 5.0 uF ±20%, 200 wvdc, mylar Cap, 0.1 uF (-20% +80%), 2S wvdc,

disc ceramic Cap, 33 pF ±5%, SOO wvdc, silver mica

X663FS0502W 5815000Y5UOO 1042 DM15E330J

84411 72982

72136

1 1

1

AIEl AIE2 AlE)

Binding Post, Binding Post, Binding Post,

red same as black

AIEl 29..1-R

29-1-B

81073

81073

2

1

Mounting Plate 29B32-1 81073 1

Shorting Link 0938-9712 24655 1

A1J1 Connector, Electric

electrical, 20-pin, type KS-14160-L1

Western 47B14S1S 71785 1

A1R1 A1R2

A1RJ

A1R4

AIRS

A1R6 A1R7

A1R8

A1R9

A1RIO A1Rll

A1R12

A1R13

A1R14

A1RI5

NOT USED Res, 140 ohms ±2%, 1 W at 12SoC, metal

film Res, 681 ohms ±1%, 1/4 W at 12SoC,

metal film Res, 2610 ohms ±1%, 1/10 W at 12SoC,

metal film Res, 4530 ohms ±1%, 1/10 W' at 12SoC,

metal film NOT USED Res, 6040 ohms ±1%, 1/10 W at 12SoC,

metal film Res, 3400 ohms ±1%, 1/10 W at 12SoC,

metal film Res, lS80 ohms ±1%, 1/10 W at 12SoC,

metal film Res, 4S30 ohms, same as AIRS Res, 499 ohms ±1%, 1/10 W at 12SoC,

metal film Res, 4990 ohms ±1%, 1/10 W at 12SoC,

metal film Res, 4870 ohms ±1%, 1/10 W at 12SoC,

metal film Res, lS8 ohms ±1%, 1/10 W at 12SoC,

metal film Res, 4990 ohms, same as AlR12

Type C-32

RY6SD6810F

RYS7D2611F

RYS7D4S31F

RYS7D6041F

RYS7D3401F

RYS7D1S81F

RYS7D4990F

RYS7D4991F

RYS 7D4871F

RYS7DlS80F

16299

18410

18410

18410

18410

18410

18410

18410

18410

18410

18410

I

1

1

1

2

1

1

1

1

3

1

1

3-72 33

PARTS LIST

QTYIREF DES DES CR IPT ION MFRPART NO. ASSY

MODULE A1 (MODEL 3126B)

A1R16 Res, 49.9 ohms ±1%, 1/10 W at 125°C, metal film

A1R17 Res, 4990 ohms, same as A1R12 A1R18 Res, 15.8 ohms ±1%, 1/10 W at 125°C,

metal film A1R19 Res, 15.8 ohms, same as A1R18

A1S1 Switch, rotary, 4-po1e, 9-pos, 2-deck A1S2 Switch, rotary, 4-po1e, ll-pos, 4-deck

A1T1 Transformer, input, 1:1 turns ratio, 9.0 ohms ±10% dc resistance

I

(Cont)

RY57D49R9F 18410

RY57D15R8F 18410

3126S1 18410 3121S2 1841G

3126A1T1 18410

1

2

1 1

1

34 3-72

PARTS LIST

QTY/REF DES DESCRIPTION PART NO. MFR ASSY

MODULE Al (MODEL 3132)

AlGI Cap, 5.0 uF ±20%, 200 wvdc, mylar X663F50502W 84411 1 A1e2 Cap, 0.1 uF (-20% +8010), 25 wvdc, ceramic 5815000YSUOO 72982 1

l04z

AIEl Binding Post, red 29-1-R 81073 2 AIE2 Binding Post, same as AIEl A1E3 Binding Post, black 29-1-B 81073 1

Mounting Plate 29B32-1 81073 1

A1RI Res, 75 ohms ±5%, 2 W, metal film Type C-42S 16299 1 16299 1A1R2 Res, 140 ohms ±2%, 1 W at 125°C, Type C-32

metal film Res, 681 ohms ±1%, 1/4 W at 125°C, RY65D6810F 18410 1A1R3

metal film A1R4 NOT USED A1R5 NOT USED A1R6 NOT USED A1R7 Res, 6040 ohms ±1%, 1/10 W at 125°C, RY57D6041F 18410 1

metal film A1R8 Res, 3400 ohms ±1%, 1/10 W at 125°C, RY57D3401F 18410 1

metal film A1R9 Res, 1580 ohms ±1%, 1/10 W.at 125°C, RY57D1581F 18410 1

metal film A1R10 Res, 4530 ohms ±1%, 1/10 W at 125°C, RY57D4531F 18410 1

metal film A1Rll Res, 499 ohms ±1%, 1/10 W at 125°C, RY57D4990F 18410 1

metal film A1Rl2 Res, 4990 ohms ±1%, 1/10 W at 125°C, RY57D4991F 18410 3

metal film A1R13 Res, 4870 ohms ±1%, 1/10 Wat 125°C, RY57D4871F 18410 1

metal film A1R14 Res, 158 ohms ±1%, 1/10 W at 125°C, RY57D1580F 18410 1

metal film Res, 4990 ohms, same as A1R12A1R15

18410 1RY57D49R9FRes, 49.9 ohms ±1%, 1/10 W at 125°C,A1R16 metal film

Res, 4990 ohms, same as A1R12A1R17 218410RY57D15R8FRes, 15.8 ohms ±1%, 1/10 W at 125°C,A1R18

metal film Res, 15.8 ohms, same as A1R18A1R19

3-72 35

pARTS LIST

QTY/REF DES DESCRIPTION PART NO. MFR ASSY

MODULE A1 (MODEL 3132) (Cont)

3131S1 118410Switch, rotary, 4-po1e, 9-pos, 2-deckA1S1 3121S2 18410SWitch, rotary, 4-po1e, 11-pos, 4-deck 1A1S2

Transformer, input, 1:1 turns ratio, 3126A1T1A1Tl 18410 1 9.0 ohms ±10% dc resistance

......

-36 3-72

PARTS LIST

REF DES DESCRIPTION PART NO. MFR QTY/ ASSY

MODULE A2

A2Cl A2C2

A2C3 A2C4 A2CS A2C6

A2Ci A2C8 A2C9

Cap, 15 pF ±5%, 500 wvdc, silver mica Cap, 0.01 uF ±2ato, 200 wvdc, disc ceramic

Cap, 470 pF ±S%, 500 wvdc, silver mica NOT USED Cap, 10 uF ±2~1o, 10 wvdc, tantalum Cap, 0.1 uF (-20%, +80%), 25 wvdc,

disc ceramic Cap, 10 uF, same as A2C5 Cap, 250 pF ±5%, 500 wvdc, silver mica Cap, 0.1 uF ±10%, 200 wvdc, metalized

mylar

DM15ClS0J 0805030ZSUOO 103M DM19E471J

KlOWlO 581S000YSUOO 1042

DM15E251J 210B1C104K

72136 72982

72136

05397 72982

72136 14752

1 1

1

2 1

1 1

A2Ll Coil, rf, 1.0 mR, 34 ohms de resistance UiOZ 99848 1

A2Ql A2Q2 A2Q3 A2Q4

Transistor, Transistor, Transistor, Transistor,

silicon, N-channel, silicon, NPN silicon, PNP same as A2Q2

FET 400 0000 RC3710 2N4058

no 18410 18410 01295

1 2 1

I

A2Rl A2R2 A2R3 AZR4 A2RS A2R6 A2R7 A2R8 A2R9 A2R10 A2Rll A1R12 A2R13 AZR14 A2R15

Res, 10,000 ohms ±5%, 1/2 W, carbon Res, 1 megohm ±5%, 1/2 W, carbon Res, 680 ohms ±5%, 1/2 W, carbon Res, 390 ohms ±5%, 1/2 W, ~arbon Res, 1500 ohms ±5%, 1/2 W, carbon Res, 68 ohms ±5%, 1/2 W, carbon Res, 3300 ohms ±5%, 1/2 W, carbon Res, 2200 ohms ±5%, 1/2 W, carbon Nar USED Res, 33,000 ohms ±5%, 1/2 W, carbon Res, 10,000 ohms, same as A2Rl Res, var, 500 ohms ±20%, 1/8 W, comp Res, 100 ohms ±5%, 1/2 W, carbon Res, 1100 ohms ±5%, 1/2 W, carbon Res, 150 ohms ±5%, 1/2 W, carbon

EBi035 EB1055 EB6815 EB3915 EB1525 EB68"05 EB3325 EB2225

EB3335

220S501B EBI015 EB1125 EB1515

01121 01121 01121 01121 01121 01121 01121 01121

01121

34263 01121 01121 01121

2 1 1 1 1 1 1 1

1

1 1 1 1

AZYI Crystal, 250.0000 kRz Type CR-46A/ U

1:3571 1

3-72 37

PARTS LIST

REF DES DESCRIPTION PART NO. MFR QTY! ASSY

MODULE A3

A3Cl Cap, 0.1 uF (-20%, +80%), disc ceramic

25 wvdc, 5815000Y5UOO 104Z

72982 1

A3C2

A3C3 A3C4

Cap, 0.1 uF ±10%, 200 wvdc, meta1ized mylar

Cap, 0.1 uF, same as A3C2 Cap, 0.01 uF ±20%, 200 wvdc, disc

ceramic

2l0BlCl04K

0805030Z5UOO 103M

14752

72982

3

2

A3C5 A3C6 A3C7 A3C8

A3C9

A3C10 A3Cll

Cap, 0.1 uF, same as A3C2 Cap, 1500 pF ±5%, 500 wvdc, silver mica Cap, 4000 pF ±5%, 500 wvdc, silver mica Cap, 47 pF ±5%, 200 wvdc, N470, disc

ceramic (temperature coefficient selected as required)

Cap, 27 pF ±5%, 500 wvdc, NPO disc ceramic

Cap, ver, 1.7-20 pF, air dielectric Cap, 110 pF ±5%, 500 wvdc, NPO disc

ceramic

DM19E152J DM19E402J 0805000T2H04 70J

0851000COG02 70J 193-6-5 0841000COG01 11J

72136 72136 72982

72982

74970 72982

1 1 1

1

2 1

A3C12 A3C13

Cap, var, 1.7-20 pF, same as A3C10 Cap, 155 pF ±5%, 200 wvdc, N080 disc

ceramic 0845030U1GOl 550J

72982 1

A3C14 A3C15 A3C16 A3C17

Cap, var, 2.2-34 pF, air dielectric Cap, 535 pF ±l%, 500 wvdc, silver mica Cap, var, 2.2-34 pF, same as A3C14 Cap, 33 pF ±5%, 200 wvdc, NPO disc

ceramic

193-10-5 DM19E5350F

0805000COG03 30J

74970 72136

72982

2 1

1

A3C18 A3C19

Cap, Cap,

0.01 uF, same as A3C4 22 pF ±5%, 500 wvdc, silver mica DM15C220J 72136 1

A3CRl Diodes, matched pair RY3605 18410 1

A3L1 A3L2 A3L3 A3L4

Coil, rf, Coil, rf, Coil, rf, Coil, rf,

1.0 roB 150 uH var, 1.5-3.1 uH 150 uH, same as A3L2

Ul02 3150-12 3121L3A

99848 99848 18410

1 2 1

A3Ql A3Q2

Transistor, Transistor,

NPN same as A3Q1

RC3710 18410 2

38 3-72

PARTS LIST

-

QTYIREF DES DESCRIPTION PART NO. MFR ASSY

MODULE A3 (Cont)

A3R1 Res, 68 ohms ±5%, 1/2 W, carbon EB6805 01121 2 A3R2 Res, 68 ohms, Bame as A3R1 A3R3 Res, 680 ohms ±5%, 1/2 W, carbon EB6815 01121 1 A3R4 Res, 1000 ohms ±5%, 1/2 W, carbon EBl025 01121 3 A3R5 Res, 3300 ohms ±5%, 1/2 W, carbon EB3325 01121 1 A3R6 Res, 10,000 ohms ±5%, 1/2 W, carbon EBI035 01121 2 A3R7 Res, 10,000 ohms, same as A3R6 A3R8 Res, 2700 ohms ±5%, 1/2 W, carbon 01121 1EB2725 A3R9 Res, 1000 ohms, same as A3R4 A3RIO Res, 1000 ohms, same as A3R4

EB4705 01121 1

A3S3

Res, 47 ohms ±S%, 1/2 W, carbonA3Rll

3l21S3A 18410 1

A3T1

Switch, rotary

1Transformer, balanced demodulator 58-122-02 06978

I

I

I

3-72 39

PARTS LIST

REF DES DESCRIPTION PART NO. MFR QTY/ ASSY

MODULE A4

A4cl Cap, 0.01 uF i20%, 200 wvdc, disc ceramic 0805D3025UOO 72982 6 103M

A4C2 Cap, 0.1 uF (~207o, +80%), 25 wvdc, disc 5815DDDY5UDD 72982 10 ceramic 1042

A4C3 C~p, 0.1 uF ilO%, 200 wvdc, metalized 21DB1C1D4K 14752 4 mylar

A4c4 Cap, 0.1 uF, same as A4C2 A4c5 Cap, 0.1 uF, same as A4C2 A4C6 Cap, 0.01 uF, same as A4cl A4C7 Cap, var, 5-25 pF, 350 wvdc, NPO ceramic 055705lCOP03 72982 4

9R A4C8 Cap, var, 5-25 pF, same as A4C7 A4C9 Cap, var, 5-25 pF, \lame as A4C7 A4cIO Cap, var, 5-25 pF, same as A4C7 A4Cll Cap, 68 pF i5%, 500 wvdc, silver mica DM15E680J 72136 1 A4C12 Cap, 0.01 uF, same as A4Cl A4c13 Cap, 0.1 uF, same as A4C3 A4c14 Cap, 0.1 uF, same as A4C2 A4C15 Cap, 0.1 uF, same as A4C2 A4C16 Cap, 0.01 uF, same as A4Cl A4C17 Cap, 0.1 uF, same as A4C3 A4C18 Cap, 0.1 uF, same as A4C2 A4c19 Cap, 0.1 uF, same as A4C2 A4C20 Cap, 0.1 uF, same as A4C2 A4c21 Cap, 0.01 uF, same as A4c1 A4C22 Cap, 0.1 uF, same as A4c3 A4c23 Cap, 0.1 uF, same as A4C2 A4c24 Cap, 0.1 uF, same as A4c2 A4C25 Cap, 0.01 uF, same as A4cl

A4CR1 Diode, germanium lN277 03877 1

A4FLl Filter, bandpass, 2215 kHz, lOO-Hz 3121FLl-l06 18410 1 BW (used in units with lOO-Hz selectivity)

A4FLl Filter, bandpass, 2215 kHZ, 250~Hz BW 3l21FLl 18410 1 A4FL2 Filter, bandpass, 2215 kHz, 2500-Hz BW 3121FL2 18410 1

A4Ll Coil, rf, 1.0 mH, 34 ohms dc resistance Ul02 99848 3 A4L2 Coil, rf, 1.0 mH, same as A4Ll A4L3 Coil, rf, 1.0 mH, same as A4Ll

40 3~72

PARTS LIST

REF DES DESCRIPTION PART NO. MFR QTYI ASSY

MODULE A4 (Cont

A4Ql Transistor, silicon, NPN RC3710 18410 7 (used in units with 2S0-Hz selectivity)

A4Ql Transistor, silicon, NPN 2N4l24 04713 7 (used in units with 100-Hz selectivity)

A4Q2 Transistor, same as A4Q1 A4Q3 Transistor, same as A4Ql A4fi+ Transistor, same as A4Ql A4Q5 Transistor, same 8S A4Ql A4Q6 Transistor, silicon, NPN 2N4124 04713 1 A4Q7 Transistor, same 8S A4Ql A4Q8 Transistor, same 8S A4Ql

A4Rl Res, 200 ohms ±5%, 1/2 W, carbon EB2015 01121 1 A4R2 Res, 6200 ohms ±5%, 1/2 W, carbon EB6225 01121 1 A4R3 Res, 4300 ohms ±5%, 1/2 W, carbon EB4325 01121 1 A4R4 Res, 10,000 ohms ±5%, 1/2 W, carbon EBI035 01121 7 A4R5 Res, var, 200 ohms ±20%, 1/2 W, carbon 362Y201B 11236 1 A4R6 Res, 680 ohms ±S%, 1/2 W, carbon EB681S 01121 3 A4R7 Res, 10,000 ohms, same as A4R4 A4R8 Res, 2700 ohms ±S%, 1/2 W, carbon EB272S 01121 2 A4R9 Res, 3900 ohms ±S%, 1/2 W, carbon EB3925 01121 2 A4R10 Res, 390 ohms ±5%, 1/2 W, carbon EB3915 01121 3 A4Rll Res, 680 ohms, same as A4R6 A4R12 A4R13

Res, Res,

1100 ohms ±S/o, 1/2 W,' carbon 47,000 ohms ±5%, 1/2 W, carbon

EB112S EB473S

01121 01121

1 1

A4R14 Res, 18,000 ohms ±S%, 1/2 W, carbon EB1835 01121 1 A4RlS Res, 10,000 ohms, same as A4R4 A4Rl6 Res, 3900 ohms, same as A4R9 A4R17 Res, 1000 ohms ±S%, 1/2 W, carbon EB1025 01121 3 A4R18 NOT USED A4R19 Res, 10,000 ohms, same as A4R4 A4R20 Res, 4700 ohms ±5%, 1/2 W, carbon EB4725 01121 1 A4R21 Res, 1000 ohms, same as A4R17 A4R22 Res, 10,000 ohms, same as 4R4 A4R23 Res, 2200 ohms ±5%, 1/2 W, carbon EB2225 01121 1 A4R24 Res, 390 ohms, same as A4R10 A4R25 Res, 10,000 ohms, same as A4R4 A4R26 A4R27

Res, Res,

27,000 ohms ±S%, 1/2 W, carbon 1000 ohms, same as A4Rl7

EB2735 01121 1

A4R28 Res, 10,000 ohms, same as A4R4

3-72 41

PARTS LIST

REF DES DESCRIPTION PART NO. MFR QTY/ ASSY

MODULE A4 (Cont)

A4R29 A4R30 A4R31 A4R32 A4R33

A4R34

A4s4

A4T1 A4T2 A4T3

Res, 3300 ohms ±5%, 1/2 W, carbon Res, 2700 ohms, same as A4R8 Res, 390 ohms, same as A4R10 Res, 680 ohms, same as A4R6 Res, 1000 ohms min., 3000 ohms max.

±5%, 1/2 W, carbon (used in 100-Hz selectivity units only)

Res, 12,000 ohms ±5%, 1/2 W, carbon (used in 100-Hz selectivity unit only if needed)

I EB3325

I EB Type

I EB1235

01121

01121

01121

1

1

1

Switch, rotary, circuit type

2-po1e, 2-pos, printed I 3121S4 18410 1

Transformer, Transformer, Transformer,

i-f, same same

2215 kHz as A4T1 as A4T1

I B3807 18410 3

42 3-72

PARTS LIST

REF DES DESCRIPTION PART NO. MFR QTY! ASSY

MODULE AS

ASCI

ASC2 ASC3

ASC4 ASC5

ASC6 ASC7

ASC8 ASC9 ASClO ASCll ASC12 ASC13 A5C14

A5C1S A5C16 ASC17 A5C18

Cap, 10 uF (-10%, +100%), 15 wvdc, dry electrolytic

NOT USED Cap, 0.1 uF ±10%, 200 wvdc, meta1ized

mylar Cap, 200 pF ±5%, 500 wvdc, silver mica Cap, 0.1 uF (-20%, +80%), 25 wvdc,

disc ceramic Cap, 59 pF ±5%, 500 wvdc, silver mica Cap, 0.01 uF ±20%, 200 wvdc, disc ceramic

Cap, 0.01 uF, same as AsC7 Cap, 0.01 uF, same as AsC7 Cap, 0.01 uF, same as AsC7 Cap, 0.1 uF, same as AsC5 Cap, 0.01 uF, same as A5C7 Cap,. 0.01 uF, same as A5C7 Cap, 0.001 uF ±20%, 500 wvdc, disc

ceramic Cap, 10 uF ±20%, 10 wvdc, tantalum Cap, 10 uF, same as A5C1 Cap, 22 uF ±20%, 6 wvdc, tantalum Cap, 0.1 uF, same as ASC5

30D106G015BA 2

21OB1C104K

DM15E201J S81S000Y5UOO 104Z DM1SE590J 080S030ZSUOO 103M

831000Z5UOOI 02M KlOW10

K22W6

56289

14752

72136 72982

72136 72982

72982

05397

05397

2

1

1 3

1 6

1

1

1

ASCR1 ASCR2 A5CR3

NOT USED Diode Diode, same as A5CR2

1N277 03877 2

ASIC1 Integrated Circuit GEL237Fl 03508 1

ASL1 Coil, rf, 1. 0 rnH Ul02 99848 1

ASQl A5Q2 A5Q3 A5Q4 A5Q5

Transistor, Transistor, Transistor, Transistor, Transistor,

NPN NPN same same same

as as as

ASQ2 A5Q2 A5Q2

2N3053 RC3710

79089 18410

1 4

A5R1 AsR2

Res, Res,

1000 ohms ±5%, 1/2 W, carbon 820 ohms ±5%, 1/2 W, carbon

EB1025 EB8215

01121 01121

4 2

3-72 43

PARTS LIST

REF DES DESCRIPTION PART NO. MFR QTY/ ASSY

MODULE A5 (Cont)

ASR3 ASR4

A5R5 ASR6 A5R7 A5R8 ASR9 A5R10 A5R11 ASR12 A5R13 ASR14 A5R15 A5R16 A5R17 A5Rl8 A5R19 A5R20 A5R21 A5R22

·ASR23 ASR24

NOT USED Res, 60,400 ohms ±1%, 1/8 W at 125°C,

metal film Res, 10,000 ohms ±5%, 1/2 W, carbon Res, 2000 ohms ±5%, 1/2 W, carbon Res, 4700 ohms ±5%, 1/2 W, carbon Res, 1000 ohms, same as A5Rl Res, 8200 ohms ±5%, 1/2 W, carbon Res, 2200 ohms ±5%, 1/2 W, carbon Res, 1000 ohms, same as A5Rl Res, 1000 ohms, same as A5Rl Res, 4700 ohms, same as A5R7 Res, 4700 ohms, same as A5R7 Res, 3900 ohms ±5%, 1/2 W, carbon Res, 15,000 ohms ±5%, 1/2 W, carbon Res, 150,000 ohms ±5%, 1/2 W, carbQn Res, 15,000 ohms, same as A5R16 Res, 820 ohms, same as A5R2 Res, 390,000 ohms ±5%, 1/2 W, carbon Res, 56,000 ohms ±5%, 1/2 W, carbon Res, 15,000 ohms, same as A5R16 Res, 56,000 ohms, same as A5R21 Res, 180,000 ohms ±5%, 1/2 W, carbon

RY60D6042F

EBI035 EB2025 EB4725

EB8225 EB2225

EB3925 EB1535 EB1545

EB3945 EB5635

EB1845

18410

01121 01121 01121

01121 01121

01121 01121 01121

01121 01121

01121

1

1 1 3

1 1

1 3 1

1 2

1

A5S5 S~itch, rotary 3121S5 18410 1

A5VR1 Diode, Zener IN960B 07910 1

A5Y1 ASY2

Crystal, Crystal,

2213.5 2216.5

kHz kHz

159 160

13571 13571

1 1

44 3-72

PARTS LIST

REF DES

A6c1

A6CRl

A6R1 A6R2

A6VRl

.....

Cap, 250 uF ( wvdc, dry electrolytic

Diode, full-wave 100 piv

Res, 200 ohms Res, 820 ohms

Diode, Zener,

DESCRIPTION

-

PART NO. MFR QTY/ ASSY

MODULE A6

+l 00% ) at 85°C, 50

bridge, t. 0 amp,

±5%, 5 W, wire-wound ±5%, 1/2 W, carbon

15 V ±10%, 10 W

10/0 , JA-13-250-50 -8P

FWBTS3001

4599 EB8215

1N2979A

29309

72982

44655 01121

04713

1

1

1 1

1

.

3-72 45

PARTS LIST

DESCRIPTIONr REF DES

MODULE A7

Cap, 0.01 uF ±20%, 200 wvdc, ceramicA7C1

A7C2 Cap, 0.1 uF (-20%, +80%), 25 wvdc, ceramic

A7C3 Cap, 0.22 uF ±20%, 12 wvdc, ceramic

A7C4 eap, 10 uF ±20%, 10 wvdc, tantalum A7C5 Cap, 180 pF ±5%, 500 wvdc, mica A7C6 Cap, 250 pF ±5%, 500 wvdc, mica A7C7 Cap, 270 pF ±5%, 500 wvdc, mica A7C8 Cap, 250 pF, same as A7C6 A7C9 Cap, 180 pF, same as A7C5 A7e10 Cap, 10 uF, same as A7C4 A7Cll Cap, 10 uF, same as A7C4 A7C12 Cap, 10 uF, same as A7C4 A7C13 Cap, var, 5.5-18 pF, 350 wvdc, NPO.

ceramic A7C14 Cap, 30 pF ±5%, 500 wvdc, mica

(nominal value) A7C15 Cap, 300 pF ±5%, 500 wvdc, mica A7C16 Cap, 200 pF ±5%, 500 wvdc, mica A7C17 Cap, 110 pF ±5%, 500 wvdc, mica A7C18 Cap, 0.01 uF, same as A7C1 A7C19 Cap, 0.1 uF, same as A7C2

Integrated Circuit, monolithic, siliconA7IC1

A7Ll Coil, rf, 1 mH A7L2 Coil Assy, 2 incapsulated coils,

28.5 mH and 100 mH A7L3 Coil ABSY, same as A7L2 A7IA Coil, rf, 1 mH, same as A7L1 A7L5 Coil, rf, 47 uH

A7Ql Transistor, silicon, NPN A7Q2 Transistor, same as A7Q1 A7Q3 Transistor, same as A7Q1 A7Q4 Transistor, same as A7Ql A7Q5 Transistor, same as A7Q1

PART NO. MFR QTY/ ASSY

0805030Z5UOO 72982 2 ,

103M 5815000Y5UOO 72982 2 104Z 5615000Y5FOO 72982 1 224M K10W10 05397 4 DM15E181J 72136 2 DM15E251J 72136 2 DM15E271J 72136 1

5380115.518A 72982 1

DM15E300J 72136 1

DM15E30lJ 72136 1 DM15E201J 72136 1 DM15El11J 72136 1

CA3028A 79089 1

Ul02 99848 2 3071-71 18410 2

3071-81 18410 1

RC3710 18410 5

46 3-72

PARTS LIST

REF DES

A7R1 A7R2 A7R3 A7R4 A7R5 A7R6 A7R7 A7R8 A7R9 A7R10 A7Rll A7R12 A7R13 A7Rl4 A7R15 A7R16 A7R17 A7R18 A7R19 A7R20 A7R21

Anl

DESCRIPTION

MODULE A7

Res, 270 ohms ±5/0, 1/4 W, carbon Res, 18,000 ohms ±5%, 1/4 W, Res, 3900 ohms ±5/0, 1/4 W, carbon Res, 1500 ohms ±5/0, 1/4 W, carbon Res, 820 ohms ±5/0, 1/4 W, carbon Res, 2200 ohms ±5/0, 1/4 W, carbon Res, 2200 ohms, same as A7R6 Res, 1000 ohms ±5/0, 1/4 W, carbon Res, 820 ohms, same as A7R5 Res, 180 ohms ±S/o, 1/4 W, carbon Res, 620 ohms ±S/o, 1/4 W, carbon Res, 1500 ohms, same as A7R4 Res, 270 ohms, same as A7R1 Res, 39,000 ohms ±5%, 1/4 W, Res, 10,000 ohms ±5/0, 1/4 W, Res, 2700 ohms ±5/0, 1/4 W, carbon Res, 100,000 ohms ±S%, 1/4 W, Res, 15,000 ohms ±5/0, 1/4 W, Res, 22,000 ohms ±5%, 1/4 W, Res, 4700 ohms ±5/0, 1/4 W, carbon Res, 1500 ohms, same as A7R4

Crystal, quartz, 2215 kHz

QTY./MFRPART NO. ASSY

(Cont)

CB2715 01121 2 carbon CB1835 01121 1

CB3925 01121 1 CB1525 01121 3 CB8215 01121 2 CB2225 01121 2

CB102S 01121 1

1CB1815 01121 1CB6215 01121

01121 1CB3935carbon 101121carbon CBI035 1CB2725 01121

carbon CB1045 01121 1 101121carbon CB1535 1carbon CB2235 01121

CB4725 01121 1

18410 13071-181

3-72 47

~

o o

8 ()

<>-i RI3 ~ 100

-l1~50 ~

@ 03

B 2N4058

~ .~-lc' E~!3710

_8 ~N1 1"'''­~= -­ s u~ U .G 01 -:

+~ """'000"0

o

TERM

:=Y 4

5

:~ 8

Figure 6 Module A'4.

WIRE COLOR

COAX

WHT-GRN

WHT-R

COAX

RED

~ u 0

G5 53;) CI6 -

2,2.34 @E6 Q7 C9

~ qpQI3 J5C CCII 1101

ffiffiffiCI4 2,2-34 CI2 1.7-20 CIO 1,7-20

o

BUS

BUS

WIRE COLOR

A3E3

A3E5

TERM

A3El-A----COAX

A3E2---.r

L4

A3E6 BUS

A3E7~COAX} A3E8

A3E4

UNITS WITH MODULE A7

........

.......

Figure 7 Module A3 .......,

48 3-72

WIRE ~ C25"'~ ~ , C@::>~ @ TERM COLOR

~ ~$'@~ A4E1 RED ", ot; ­C§..,~~ [] .0 ~~ o I- § ~ _ C§3 a,lUD A4E2 COAX

~ 5 ::;(9) 0 A4E3 BUSr A4E4 WHT-YEL

0 A4E5 WHT-VIO

COAXA4E6=9

A4E8

A4E7 RED

NOTES:

1. 100Hz SELECTIVITY units: Transistors Q1 thru Q8 are type 2N4124 and are positioned same as Q6.

2. Board shown is for 250Hz SELECTIVITY units except as noted.

3. R33, R34 used only in units with 100Hz SELECTIVITY. R34 deleted and bus used in place of R33 in units with 250Hz SELECTIVITY.

" ",!",!~==":::"':""'::::b-NOTE 3

o o o

o

Figure 8 Module A4

3-72 49

IN960B

~

~ a1 .l~~ r. ~

~

CIO ~

CD ~ EIO @

GIB o.lUD EI2 CI~ @ ~ +!22UFIC17 n ""~

~ q ""

~ ,,0 ° R I -10 ~ It')6 - .. -

c;QDC12 c' B

~ ·'"'05 ~ RC3710

EI~ EII@ CII .1

~~-llilL.-J -....

~ :::~~~~ ~ ~ ~

° S!0r<lOo~ U _p ~,

TERM

ASEl

ASE2

ASE3

ASE4

ASES

ASE6

ASE7

ASE9~

ASE8

ASE10

ASEll

ASE12

ASE13

WIRE COLOR

RED-BLK

RED

Not used

Not used

ORN

RED

RED

COAX

GRN

WHT-GRN

BLU

BLK ~

Figure 9 Module A5

TERM

A7El

?A7E2

A7E3~

A7E4

WIRE COLOR

COAX

RED

COAX

-;

--..

--.,

Figure 10 Module A7

50 3-72

I

(r

W

...... N

INPUT EMITTER LOW PASS 1ST I F INPUT • SELECTOR l- FOLLOWER AMPLIFIERI-- FILTER

FILTER DRIVER

A4Q3

COUNTER OUTPUT

A7QI-A7Q5

I­SELECTABLE BAND PASS

FILTER FLI - FL2

I-­ALTER

MATCHING AMPLIFIER A4Q4-A4Q5

l­~ AISI FL3 A4QI-A4Q2 - ATTENUATOR

AIATI A2Q1. A203-A2Q4 -

f 2215 - 3715KCCALIBRATE

OSCILLATOR LOCAL

I F OUTPUT AMPLIFIER

A4QB

BALANCED MODULATOR

A3CRI

AM -SSB DEMOOUI.ATOR ASCR2-ASCR3

f--COUNTERI-MODULATOR

DRIVERA3QI250KC OSCILLATOR

A2Q2 A3Q2 ~ r l

2ND IF 3RD I F 1ST AUDIO AUDIO OUTPUT AMPLIFIER

ASICI r rI-- AMPLIFIERAMPLIFIER I-- AMPLIFIER~ I-­ I­

A4Q7A4Q6 A5Q5

1 f CARRIER

METER METER AND REINSERTION DETECTOR SELECTORf­ ~L~~~k~TSI~EAMCRI CIRCUITS

A5Q3,A5Q4

115VAC II>lPUT

POWER SUPPLY REGULATOR ~A6CRI

H~ A5QI-A5Q2 -• AND

CHARGER .

I>lICAI). BATTERY

BTl

9.4 V DC REGULATED

12V DC UNREGULATED

.... Figure 11­VI' Block Diagram N

VI

-----------

I

L

RB 3.400 R9 1,580

......------------'

RII 499

RI6 49.9

RI4 158

6

RI9 15.8

R7 6,040 OUT

IN ----,

S2-SEC A S2-SEC B (FRONT) (FRONT)

r - - -- - - -- - --(- -- - - - - - R12- - ~ - - - - - - - - ­: "4.990

\IATTEN'UATORI

_----OB-----, , S2

r--VOLTS-----, SEC S,2 " ©;:cI . CAL, I A©(REAR)-40 .01 -30(3 ,\ -20

:::~n .3-1~ RI7

RI8 4,99015.8-70 .OO03:::1~ 3 tlO

-80 .0001 10 +20 ,,~---4~----------

ATTENUATOR ATI PART OF MODULE AI ABOVE

rAI r I I I

EI 5.0UF

@-...-ooool)I---.....--...,

51 (FRONT) 2

,

\

3

'­

7 6

R3 RIR2 681 140 75E2

~

IINPUT SELECTORr - - - - - - - -i

O/75<1.1

..---135<>.-TERM -600",,-.J '- BRIDGE

'--CAL

CI

I I I

: I

: I

-= I

TO A2E7 , I

1 I I I I I I I, I I I I 1 I 4 II

I ,J. J 5 I I I I

TO A2E5

C2 T°.lUF

TO A2E4

TO A5E2

J

Figure 12A 3121B Input, Schematic

3-72 53/54

----------PART ~ JI

1:( i 3) I

({-. ~ 3 I' L GR -D...--6004\ ....

14>: OlaF -= r GR - --,35tl. TERNl I......... 4 OUT-W,;----./ / "--eoo",,--,:$ : II - L-E I

51-SEC A 1\ _I I ­ I TO A2E7EI (REAR) CI ATI

'-' 5.0UF

~ :SEE DETAI~ t I

IPART OF - OF ATI 8ELOW)­JI

I~~ i II~\ It ,~ , II~~i' ,

"'[l)-. 44) I 10~«(, f:­ 3 :

R2 I15) I

140

:~S i ?r~. ~: I 761'\ I

R3 I SI·SEC B :

681

IBALI E2 (REAR) RED BRN

I(FRONT) , /5 I

I TI "'=/ I II

I YEL ORN

I J"~

TO A2E5 DISCONNECT IBAR 'IIFOR " 3

IBAl.ANCED 0OPERATION

I TO A2E4

51-SEC C I (REAR)

I-®--:l. -b I TO A5E2

E3 -= I ~I=~ J

-- - -- ----- ---... AI I - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -I INPUT SELECTORI1\ (~/;=

I~,,~":":"":.10~«( ,»=- 3 : --'" I

9/r~i 8 7 6) 5 I

51-SEC A I(FRONT) I

II,,,

, , , r-WE~ C CAL I ',~ Ih IN-EW~ ~135A8RG I

:

I

1 2,610. 4,530

0'~" I

51-SEC C 6 (FRONT)

::::r: C333

R76,040 OUT

R83.400 RS 1,580

RIl 499

R14 _ 'V1/'''o/58__..

RI6 49.9

IN ---.,

52-SEC A 52-SEC B (FRONT) (FRONT)

r-- -- ----- ---<~,- ----.~~~; --{,~---- ----­I , "

0.1A""'n"'E"'N""UA""'T"'O=RI " "

r-----DB "52" 52 VOLTS~ (0). (0).SEC SEC ~ A B~-30 ,03 (REAR) IRE

O 1~:~~3 :)0 ,~ ~:

::~3::::/ (;

\:: 3tl~ F~.~ -60 ,0001 10 +20 11t--.....---------- ­

RI9 15.8

RI7 4,990

52 SEC

C (FRONT I

/ I

I I --~/~------- L-_-.M,......-1H-......

12

.....------------~

ATTENUATOR ATI PART OF MODULE AI ABOVE

Figure 12B 3126B Input, Schematic

3-72 55/56

------

TI ;o';';;"~~~,.1 TO A2E7

II REO

TO A2E5

IC2 TO.IUF

TO A2E4

51 SEC B (REAR) (FRONT)

TO A5E2L ~

BRN

, RI , 75 " I

.. -." .., R2 140

R3 681

r----u------!INPUT SELECTOR I I B CAL U : B RIDGE---,. I ~ BRIDGE N: T".---.\ //" "'0-~!i ~ 135'" -0­ 135'" ~ : ~ 75'" ./ ' ­ 75 A C

\ 0 TERMINATED' 5 ,,,,,

E3 51 SEC A

IINPUTI (FRONT) = 51 SEC A

(REAR)

51 SEC B

EI

E2

JI

R7 6,040

RII 499

RS 1,580R83,4oo

52-SEC B ( FRCIlTl

S2-5EC A (FRONT)

IN ---.,

,/ 7 I

I r---- --- ­ ----~~,- ­ ---~~J;' ­ ",~----- ------/~----- - L-~__'"......-_+l.......~---R..J'4WI,,58--~ , " RIB 49.9

IATTENUATOR! " " 12

,..-----DB " 52 " S2 r-VOLTS---, ~ SEC ~ SEC I CAL I ~A ~B

-40 01 -30.03 .1 -20 (REAR) CRE

-50:~ :)~IC .3-1~

OUT

RIS-60 RIB 4~';0 15.8-70 .0003-::"; ­ " ­ 3 tlO 15.8

-80 .0001 10 +20 11t--+---------------<~------------...J

ATTENUATOR ATI PART OF MODULE AI ABOVE

Figure 12C 3132 Input, Schematic

3-72 57/58

- -

INPUT SELFCTOR ~WIT("H

~I

I I

I I I

I III I I 1­

I I

'I 6200

II

I ~I _

~

Al 200

rA3 = I

I

I I L_

rA4

-I

-,

RIO :n~

Fill 10K

-=

C6 O.IUc

02

RI4 1100

AR 220~

A7 :noo Y I

ZSOKC

.... • 101 •

1~~IGOjOY I

I I I I

rr __________ 9J_._-------­

I I

~ I

" 1,1'"' TI C 8 I I

250 i I I I

_1

A4 3'OJ

C2 ,OIUF !A6

,~l 68

112 ;h!

RI2

I:AL I l 500

OSC ADJ

--t-.--J I1_0 '1'470

R:3 68C,

6

4

I I

I L

,­

= I I , - - - - - - - - L 1­ - -

IOIolHY WHT- R 5 rv-YY' • • I

WHT-GAN

-.J

ATT£NUATOR

AT!

- -

1­

I

I I I I I I

..J

--1 RI

200 rA6­

L

p

F.-a ... K

TI

II

I

I

~-i1LI(

, -,._--"

l

111:1 VAcl

.

CO'i

.::;

;:

I I

L 'RI

,"'2919"

-=

S7

(F"v"Tl

f1­

"

R28 10K

C22 .IUF

L __

C21 .0IUF

CI8 CI9 .IUF .IUF

Rill 10K

l2 I. 0 "111 v

RIG 3900

RI7 1000

RI3 47K

RI4 S RI5 S CI4 -L­ -L- CI5 I R20 ~ I I l R21 ~ I R23 < R24< --L C20 I I R29

_. 18K: 10K: ~~UFT--I-~:_4700: I • ~ 1000: • 2200: 390: :.,UF I • D00~ ~~

Cil .0IUF

CI3 ,IUF

RI2 1100

CII 68

II 1.0 litH

-1"" ­ - -fShECTIVlffl I 1100HZ)

"""6"'" 4 IlIT)

SEE

C6 .0IUF

RIO 390

R9 3900

R7 10K

RB 2700

A4

C23 .IUF

CRI IN277

R26 27K

R27 1000

R~<;

10K

LE5_

-, I

WH-VIO

MI

NOTES:

I. UNLESS OTHERWISE NOTED RESISTANCE VALUES AI

2. UNLESS OTHERWISE NOTED CAPACITANCE VALUES I 3. REFERENCE DESIGNATIONS ARE ASSIGNED STARTIN

MODULE TO DEFINE PART AND LOCATION PREFIX,

WITH MODULE IDENTIFICATION SUCH AS A2RI. CH~

PREFIXED IN THIS MANNER.

4. Al l ROTARY SWITCHES ARE VIEWPl FROM KNOB E EXTREME COUNTER CLOCKWISE POSITION, RE"ER

SCREENING AT EACH POSITION.

5. PANEL AND CHASSIS SCREENING DENOTED BY = 6. All TRANSISTORS ARE TYPE RC3710 EXCEPT WH

100 Hl SELECTIVITY ~,4QI THRU A4QB ARE TYPE

7. A4R33 AND A4R34 USED IN UNITS WITH 100Hl S

S7 (REAR j

I I

I

I I

10

I J I I 12\

RWHT-YEl

ICAl lEVEl]

E4

R2 10K

[5

OUTPUT ~ ICOUNTERI

U~ E4o-fI B

I -=­

I -.J

E6 o

SEE FIGURE 13

IJJ ~- ­~~:'""..

I I L

E6

--,

CIF; ('.2, }4

CI5 535

S3 8

9

10o U 1.5-3.IUHY

E5

1I

C6 1500

E4RII 41'11

I I

. II I -I"" ","'OR] I

I~ 1 W II ~. ~ II 2700 I~~OO C7 CB I ITUNINGI

= ~=~==-_-t.- •__-JL JL4:0:0:0J~,~ 47 8

L N470 ,CI2 CI3 C4 A CI7 I CI

_ _ _ _ _ _ 17-20 I'S I 33 11-150 _ _ _ _ _ _ I<OBO 2.2-34 NPO ___. J.

rA3 ~~ I ....-'IN

CIB 22UF

ELECTiVE LE

of

1218,:d26B.113~

CIS

~ 22UF

- ~ I +It:-­

OIAGRA

4

RI8 1M

Rill

1.2M

GRN

CR2 EI5 E9 ~~ CEil IN277

l RI5 RII

I 1500

1000 I, ,

CII

."~ '" . •. IUF

4700 IN277

Rt4 4700 I RI6

3900 ""IIVV

10 .0IUF

I

10 ~ ~ ~ ~4

, 5

.' S'l - - (REARl

II i ,12

Yl ~16.·

lISB

C4 2<:'0

R5 10K

YI = 2213.5 L SB

~NtoRl..J

AM L5Be:r 55

(FRONT)

C3

.IUF

1I I,OMHY

[7E6E'i

ORNIR IR

R4 60.4K 1%

VRI IN950B

+ CI IOUF

<;,

''',).:1

('

r A5 EIL2

,L

,"2

820

R-81<

I I I

FiI ~_____ •

I

LI t•

.-r---fIELECnVITY ITI 1100HZ)

RI3 47K

CI2 .0IUF

CII I CI3 68 dUF

RI2 RI4 S 1100 ~I<:

-..., E6

CIS -J,Ar CIF; 53S ~2.2-34

-IBAND safffOR]

d ITUNINGI

CI CI7 11-150 33

NPO

J'

E4 E

WHT-YEI. R

R2 ICAL LEVEll 10~ -=

r;-- l ICQUNTEffl

~~,,,",,,, OUTP~:~

E2~ E4ofT~I I -= SEE f'IGURE 13

I IE6 ES oL ..J

I I I I I

-,

R30 2700

R31 390

R28 10K

C22 .IUF

EI31 BLK

-+­

_J

CI9 22UF

CI8 22 UF

CRI 1101277

C2 I .0IUF

Rl6 27K

R27 1000

R23 10('\

CI6

'UF

RU '11<

+

B

Rl') 10K

-, I

WH-VIO

CI8 CI9 .IUF .IUF

RI9

1.2101

RI8 1M

SCHfMATIC

+ CI2 'UF

Ell

ell .IUF

~ EIO

10 lUF

RI6 3900

filS ISOO

l LO..H.,

CR3 1101277

RI7 1000

CR2 IN277 --,

RII '000

RIC S CI4 --l... ­ --l...- CIS I R20 ~ I I j R21 < I R23 < R24< ---.L- C20 I I R29 ~ C24 --L. R32

10K: .IUF_L:·IUF I 4700: I • i 1000: • 2200: 390: :.,UF I • 33('0: .IUF: 68':>,

4

5

10

~ I

- - _/ SO; (REAR)

II

'"6'''

i ,12

I I

C23 .IUF I

I LES_ ..J

57 Nil(REARi

I NOTES: , I. UNLESS OTHERWISE NOTED RESISTANCE VALUES ARE IN OHMS, K:I,OOO.

I 2. UNLESS OTHERWISE NOTED CAPACITANCE VALUES ARE IN PICOFARADS (PF)., 3. REFERENCE DESIGNATIONS ARE ASSIGNED STARTING WITH (II 0101£ AT EACH

I MODULE TO DEFINE PART AND LOCATION PREFIX, THE REFERENOE DESIGNATif I WITH MODULE IDENTIFICATION SUCH AS A2RI. CHASSIS COMPONE.NTS ARE /lOT

I PREFIXED IN THIS MANNER.

4. ALL ROTARY SWITCHES ARE VIEWE~ FROM KNOB END AND ARE SHOW" IN THE

EXTREME COUNTER CLOCKWISE POSITION. RE"ER TO INDIVIDUALS FO'! THE SCREENING AT EACH POSITION.

S. PANEL AND CHASSIS SCREENING DENOTED BY ~ BOXES.

6. ALL TRANSISTORS ARE TYPE RC3710 EXCEPT WHEN NOTED. UNITS WITH I 100 Hl SELECTIVITY A.401 THRU A408 ARE TYPE 21014124,

I 7. A4R33 AND A4R34 USED IN UNITS WITH 100Hl SELECTIVITY, IF REOUIRED. I

..

[HEADSET]

LSI

LECTIVE LEVELMEDI AM,31?IB, 6

11 --;-I

R

IA3-- -"4-"-;--::--~-,I 1000 41 I.OMHY

I I ~ II I 1 LOCAL OSC

~Ci18 - SEE A3 ON SELECTIVE LEVEL METER""""'o.p IUF SCHEMATIC DIAGRAM, FIG. 12,.....I~ 1

I~I ir-----~--------~~---_____t______JII I I ___J

1 I --~~-I--

~A7------------~-----~----- --------------,I ~ LI t lMHY RIO

I 180

RI2 2200 R6 R9 C3

820 1500 R2

0.22UF

{ 03

{ 04

L2 L3 RC371018K + I IE--­I 6 6_~~4 II~

II I I J37 ~8 06 ~501 02 I CI2

RC37W I ICOUNTEIRC3710 R8 10UF51r-~9RI 1000 I I 90--'61I

65 ~3 ..................+1/­

270 1, ~I¥¥i{ E~ ~«: -j~YE +I ~ RI4~ RII RI7~ 1 ~ C5 C9 620 39KI lOOKCI .----4 180180

I O.oIUF II 1\ +

~C4 C6 ~ ~CII......l-C7 ~C8 ---L.- CIO3 I14! /"'T"'250 ~IOUF ~ RI3""""'g70 ~R15 ~R16 :::T'IOUF~IOUF 250"""'" 2700270 10KICIR3 R4 R5 ---L.- C2 R7

I CA3028A22008203900 1500 IT°.lUF

....L.. I L4 IIMHYI I

--; I. UNLESS OTHERWISE NOTED RESISTANCE

VALUES ARE IN OHMS. K: 1000.

I RI8 05 15K RC3710 2. UNLESS OTHERWISE NOTED CAPACITANCE I

{ VALUES ARE IN PF. PICOFARAD.

I CI5 -.l

YI ~'- 3001"T' 2215 II KHz

RI9 I ~ R20 CI8 S4700 I~~IO O.oIUF II 03 1 ~CI4 1

22K

~C16 ~ L5 L;;- )f------J --'- CI. 5.5-18 1 30 1200 47UH T f,'b . JO.IUF 1

I L_~ _ __J ---~ ------­

I Figure 13 Counter Output Module, Schematic

I 6113-72 -