Sre TX Final

8/8/2019 Sre TX Final

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SRE -33STRANSMITTER

Training onOperation and Maintenance


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TX SPECIFICATIONSFrequency : 2700 MHz 2900 MHz Power I/P (Peak) : 50 mW Power O/P (Peak) : 9.5 Kw Pulse Width : 10 sec & 100 sec PRF : 700 Hz to 1000 Hz Spurious : Absent VSWR (OP) : 1: 1.5 Sector Blank : 180 (Max.)Tx-Rx Interface : RS-422 serial line

Tx-PC Interface : RS-232 serial lineCooling :Fluid Air Thermal Load :15.3 kW Flow Rate :75 l/m15 l/mTemp of air at inlet :18 C 3 C


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BLOCK DIAGRAM OF SRE


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SRE-TRANSMITTER

DRIVER ASSY

AMPLIFIER ASSY

TEST JIG

L C P

RF LOADDIRECTIONALCOUPLER


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FRONT VIEW

HPAs

RF DIVIDER

RF DRIVER

HPA DRIVER

BUS BAR

BLOWER ASSY

RFPS

MCA

AMPLIFIER ASSY DRIVER ASSY

AC DISTRIBUTIONBOX


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M AIN CONTROL ASSY ( M CA)

1. ON/OFF switch (CHA)

2 . PWR ON indicator (LED)

3. ON/OFF switch (CHB)

4 . PWR ON indicator (LED)

5 . S33 switch MASTER CLEAR pushbutton

6 . DS1 indicator (LED)(indicates which CHANNEL is operating)SPS SPSIONTPRU PRUMUX IONT


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SE M I-OPERATIVE CONTROLS: M AIN CONTROL ASSY ( M CA)

s/n CONTROL/INDICATOR

DESCRIPTION FUNCTION

1. ON/OFF Toggle switch Enable/disable processing channel Aoperations.

2. PWR ON Green lightemitting diode

When illuminated, it indicates that theprocessing channel A is operating.

3. ON/OFF Toggle switch Enable/disable processing channel Boperations.

4. PWR ON Green lightemitting diode

When illuminated, it indicates that theprocessing channel B is operating.

5. S33 Toggle switch Master Clear

5. DS1 Green lightemitting diode

When illuminated it indicates that thePRU is operating.


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PURPOSE OF THE EQUIP M ENT

To amplify the RF power received from REC in the transmission band .

To exchange serial data with the associated Receiver equipment toprovide real time information about the operating status.

To allow full equipment control / monitoring capabilities from a remotesite.

To provide modular composition of the high power amplifier stage sothat to continue normal operation even with a section faulty.

To allow corrective maintenance procedures in the high power amplifier stage without interrupting the normal operation (RF output power isreduced but it is not inhibited).


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SALIENT FEATURESThe Solid State Transmitter 9.5KWp is a S Band High Power transmitter.

Contains 8 HPA modules each with power output of 1600 W peak.

The power supply circuit includes two power transformers which

produce 21 Va.c. to supply the HPA modules andM

CA.M CA consist of two identical processing channels (A and B); only onetakes the equipment control ,other takes the "hot stand-by" role.

Each HPA modules has its own self protected power supply section that

provides a regulated voltage for the solid state power amplifiers and theBITE.

In the event of a HPA failure the equipment continues to function usingremaining amplifiers while maintenance can be performed on the faultymodule.


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RF OUTPUT TO ANTENNA

RF CABLE FROM CP 7 OF

REC ( 2 3dBm)

SRE 33STRANSMITTER

J 5

J 2 &J3

J 9

3 Mains

TRIGGERS & CONTROLSFROM J 4 OF REC

9 .5 kW

INTERFACE TO THE LCP

J1

INTERFACE WITH OTHER SUB-SYSTE M S


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FUNCTIONAL DESCRIPTION

EQUIPMENT ARCHITECTURE

Composed of seven main areas:

Power Supply and Cooling System. RF Driving RF Power Amplification RF Power M onitoring Processing Logic Transmission Controller External Interfaces


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Tx-Block Diagram


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POWER DISTRIBUTION


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TX-TURN ON MECHANISMI/P main power supply is routed through breakers CB1 and CB2 locatedon AC Distribution Panel, to blower assys and T1 transformer.

21V-50Hz 3 phase output from T1 is applied to relay box.

+28V PWR ON command from REC energizes relays K1 K6, distributing3 19V-50Hz and 21V-50 Hz voltages to the SPS Cards.

TLRRON signal is activated, through M UX board causes the K1 closureand turns ON CB3 breaker.

Voltage is applied to the primary winding of T2 power transformer whichthen provides the 21V-50Hz - three phase supply voltage to all the HPAmodules of the equipment.

AUX PWRON signal sent to Radar Receiver confirming that the

transmitter equipment is turned on when CB1 & CB2 ON.


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FUNCTIONAL DIAGRAM

2 0 dBm

1 4 1dBm 6 0 dBm4 0.3 0. 5 dBm

9 .5 kW


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TX-GENERAL BLOCK DIAGRAM


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RF PATH

Composed of RF Driving, RF Power Amplification and RF Power M onitoring.

The RF driver receives 20 dBm signal and attenuates it to 141

dBm by variable attenuator (inside RF DRIVER), and sends it tothe driver selected.

The RF signal to HPA driver is amplified and distributed to all theeight HPAs by 1/8 divider performing the RF driving task. This RFlevel can be adjusted by using the attenuators provided on the RF

DRIVER.

The input RF of 40.30.5 dBm to each HPA is amplified by theindividual HPA to 1.4kW each and combined by 8/1 combiner to 9.5 kW.


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PROCESSING LOGIC AND TRANS M ISSION CONTROLLER

-Processing Logic (PRU): 2 independent identical processing channels (A&B)-One channel operative ,other in hot stand -by mode.-Performs the BITE and status data processing.-Sending of the activation and reset commands to the HPA modules.

-Transmitter Control functional (IONT) : Manages the serial exchange with theHPA modules by means of full -duplex RS -485 data bus 0.

-External Interfaces ( M UX-S): manages external units data exchange with theProcessing Logic and links it with the Local Control Panel.

-Messages and sync signals exchange with the associated Receiver.-D ata exchange with the (Local Control Panel) for controls, monitoring andmaintenance purpose (RS -232 Link).


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SE M I-OPERATIVE CONTROLS: HIGH POWERA M PLIFIER (HPA)

1. POW indicator (LED)2 . RAD indicator (LED)3. LOP indicator (LED)4 . RF interlock5 . CANNON interlock6 . VSWR MONITOR (reflected output

power)7 . RF MONITOR (output power)8 . RF MONITOR (input power)9 . V. MAIN (power supply voltage)10. V. TEMP (test points used to find out

internaltemperature)


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SE M I-OPERATIVE CONTROLS: HIGH POWER A M PLIFIER (HPA)s/n CONTROL/

INDICATORDESCRIPTION FUNCTION

1. POW Green light emittingdiode

indicate presence of three phases input voltage.

2. RAD Green light emittingdiode

indicate that the HPA module is radiating RF power.

3. LOP Red light emittingdiode

indicate that the HPA module is radiating at low RFpower rate.

4. RF interlock enables/disables the HPA according to the correctposition of J3 mating connector

CANNONinterlock

enables/disables the HPA according to the correctposition of J1 and J2 mating connector

5. V. M AIN Red/blackTerminals

Module input power supply voltage isavailable across them (+36 V.d.c.).

6. V. TE M P Red/blackTerminals

Module internal temperature is achievedby measuring voltage level and solving thefollowing algorithm = (Vix100 -273).


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TOP VIEW OF HPA SHOWING VARIOUS SUB ASSE M BLIES

INNER VIEW OF HPA IS SHOWN BELOW AFTER RE M OVING THE TOP COVERM PS- M AIN POWER SUPPLY, CCS- CAPACITOR CIRCUIT SUPPLY

PPS- POWER SUPPLY PROTECTION, LIU LINE INTERFACE UNIT

DRIVERCAPACITORS

CIRCULATORS

MPS

LIU

PPSCCS


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HPA FUNCTIONAL DIAGRA M

VARIOUS STAGES OF RF CONVERSION IN THE HPA

ATTENUATOR30W

32V

7-8W

32V

15W

15W

AMP

50W

50W

DOUBLEMODULE

/ 200W AMP

DOUBLEMODULE

200W AMP

200W AMP

200W AMP

200W AMP

200W AMP

200W AMP

200W AMP

200W AMP

36V

36V AMP

200W

200W

36V

O/P1.6KW AMP

AMP

36V

32V AMP

HPA CONVERTS 10W INTO 1.6kW

CIRCULATORS

CIRCULATORS

10 w


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HPA DESCRIPTIONThe HPA module is managed by the LIU card.It performs the following functions:

- Power supply management;- RF amplifier stages control;-External bus management;- Alarm and status local display.Power Supply M anagement;-consists of MPS section-+36V obtained from rectifier ckts (with i/p 3 -# 21 V ac),used for amplifier stages.-RAD IATION inhibited if regulated voltage is out of specifications.

Status conditions indicated through:-POW (power supply good);- RAD (RF radiation in progress);- LOP (RF o/p power either low or missing).


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HPA DESCRIPTIONInterlock CANNON( safety switch ),enables i/p supply if properly connected.RF Amplifier Stages Control:

- LIU activates the IRA D signal enabling the input of the RF signal into theamplification chain.

-LIU evaluates RF signal level in i/p and according to the current total absorption,the number of transistors belonging to the final stages which are faulty.

-HPA module can also operate with few final transistors operative.-IOTA signal is activated by a thermal sensor if temperature inside the module

becomes high, inhibiting Radiation.External Bus M anagement: Links HPAs to Transmission controlller &External Interface.HPA Bus is divided into two parts -

-Control Signals: BTRIG, EMCON,PSYN,XERA D- RS -485 serial channel: CK,TX D .RX D


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SE M I-OPERATIVE CONTROLS: RF POWER SENSOR (RFPS)

1. ON/OFF toggle switch2 . PWR ON indicator (LED)3. Test point DIRECT RF power level

4 . Test point REFLECTED RF powerlevel5 . Connected to DIRECTIONALCOUPLER (direct RF power level)6 . Connected to DIRECTIONALCOUPLER (reflected RF power level )


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SE M I-OPERATIVE CONTROLS: RF DRIVER

1. Coaxial connector

2 . Coaxial connector

3. Adjusting connector



6 . Adjusting connector



9 . Adjusting connector

10. Coaxial connector


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The EMCON control page is selected bypressing the relevant pushbutton in theMAIN page.

This page shows Emission Control statusand allows RF radiation control by selectingthe power of Long Pulse and/or Short Pulse.SHORT PULSE. This section shows thetransmission power relevant to the short

pulse and the attenuation respect to themaximum power.LONG PULSE. This section shows thetransmission power relevant to the longpulse and the attenuation respect to themaximum power.

ATTENUATION. default value is 0dB (maximum nominal power is selected inall directions ). Selection of 127.5 dB

attenuation corresponds to radiation inhibit.RADIATION. pushbutton is pressedto enable/disable transmission.


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SE M I-OPERATIVE CONTROLS: RF DRIVERs/n CONTROL/

INDICATORDESCRIPTION FUNCTION

1. J 8 Coaxial connector Output RF power signal to Amplifier Assy

2. J 3 Coaxial connector Input RF power signal

3. AT1 Screw Allows to adjust the input RF (J3 port)level

4. J 5 Coaxial connector Receivers RF pre -amplifier signal fromthe D RIVER HPA No. 1 module

5. AT2 Screw allows to adjust the RF output level produced bythe driver HPA No. 1

5. AT3 Screw It allows to adjust the RFoutput level produced by the driver HPANo. 2

6. J7 Coaxial connector Receivers RF pre -amplifier signal fromthe D RIVER HPA No. 2 module.


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TX-LCP MAIN MENU

1. Operative mode selection area2. Functions selection area3. Malfunction display area4. Status display area5. Power status area

5

4

2

3


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Tx-STATUS INDICATORSMain indicators

INDICATORS M EANINGRAD TIMERAD

Indicates transmitters radiation time.indicates the RF radiation capability:Yellow LE D on = radiation in progress

LINK link with theTransmitter Processing Logic:0 means no -link between MCA and Local Control Panel;

RX ARX B

Indicates the RF input power from REC (CH. A)Indicates the RF input power from REC (CH. B)

RX LINK

RX SYNC

indicates the status of the RS422A serial link with theReceiver indicates the status of the Receiver synchronism link(burst trigger and emission control gate)

MAINT It indicates basic Transmitter functional mode as follows:Green LE D on = maintenance mode engaged


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LOCAL CONTROL PANELM CA and DRIVER SELECTION:

If only one processing channel isoperationalOPERATIVE indicates : SINGLE elseCHANNEL A or B legend is provided

MCA CHANNEL SELECTION

DRIVER SELECTION


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M AINTENANCE DRIVING HPAs CABINET

MCA FAULTSTATUS AREA

RED if Temp > 35 Degrees

DRIVER S STATUS AREA


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M AINTENANCE: CABINET 1

provides detailed status information concerning each HPA module

LINK FAIL: error due to data exchangeb/w MCA and the specific HPA module

-POWER: specific module the enabling signalfor MPS(ESUP signal ) and operation is correct.

-RAD ENABLE : specific HPA module the- enabling signal for radiation (ERAD signal )- and operation is correct.

-FAULT , specific HPA module is out of order

HPA CONTROL (CNT): details about thespecific HPA module.


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HPA DETAILED STATUSFAULT: indicate +36V powersupply faulty.

-OVERVOLTAGE : indicates power-Supply voltage>+40V.

UNDERVOLTAGE indicate powersupply voltage


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STATUS - INFO

DEGRADED, red diode = Transmitteroperates with reduced performances.

-2dB and -4dB represent default levelsfor degraded status and fault status(63% and 40% of available power )


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S/No.

DATE

FAULTY

HPAS/N

SLOTNo.

I/P POWER LEVEL(40.30.5dBm)

V.MAINON

HPA(36V DC15%)

HPA I/PPOWER SUPPL

Y(22VAC10%)

LCPFAULTINDIC

A-TION

LEDINDICATION

(LOPPOWRAD)

NO OF DAYS HPA HASOPERATED IN THE

SYSTEM

2.705GHz

2.795GHz

2.895GHz

SITE REPORT OF FAILED HPAs


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THANK YOU

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Sre TX Final