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SQUELCH

Buffer Amplifier

Integrated circuit U6.4 is configured as a unity gain buffer

amplifier. It provides a high input impedance to minimize load-
ing of the previous circuits.

Bandpass Filter

The audio frequency bandpass filter consists of U7.1 and its

associated circuitry. The purpose of this filter is to reject all
voice frequencies and allow only demodulated noise to pass.
The functioning of the squelch circuit depends upon the pres-
ence or absence of this noise. (When a signal is being received,
i.e. the receiver is quiet, the squelch circuit senses the absence
of noise and unsquelches the radio.)

Noise Detector

U7.2 along with associated components act as a noise de-

tector. The rectified output of U7.2 charges C11/C44 to a
nearly constant DC voltage.

DC Amplifier

U7.3 is configured as a basic amplifier with a gain of 3.

Schmitt Trigger

U7.4 is configured as an amplifier with positive feedback.

This arrangement provides hysteresis in the output versus input
characteristic. This eliminates the possibility of the squelch cir-
cuit repeatedly cutting in and out when the input signal is near
a threshold. R56 and R57 act as a voltage divider to provide a 5
volt logic level output. (Logic High = unsquelched)

FAULT DETECTOR

U4 and U5 are voltage comparators. These are configured

into four "window detectors" which sense the presence of volt-
ages within specified ranges (windows).

The four window detector circuits are U4.1 & U4.2, U4.4

& U4.3, U5.1 & U5.2, and U5.4 & U5.3. These monitor DC
operating voltages on U6.2, U1, Q2, and U3 respectively. R29
and R30 comprise a voltage divider to provide a 5 volt logic
level output. A fault is indicated when the output drops to zero.

Diode D1 and transistor Q3 monitor the output of the 8V

regulator. DI is a 8.2 volt breakdown diode. If the regulator
output voltage should rise above 8.9 V (8.2 + 0.7 base-emitter
drop) Q1will turn on and a fault will be indicated.

Transistors Q4 and Q5 are drivers for the front panel LED

CRI. These are powered from the +13.8 Vdc line before the 8V
regulator. Therefore, if the regulator opens, a fault will still be
indicated.

VOLTAGE REGULATOR

U8 is a monolithic integrated-circuit voltage regulator pro-

viding 8 Vdc. This powers all circuitry in the module with the
exception of Q2, the front panel LED and its drivers.

ADDRESS DECODER

The address decoder consists of U2, an 8-stage shift regis-

ter, and U9, a BCD-to-decimal decoder.  When A2, A1 and A0
are ’1’, ’1’, ’0’, respectively and the ENABLE line is high, Q7
on U9 goes high.  This enables data input to U2 to propagate
through it, controlled by the clock pulses on U2-3.  When the
ENABLE signal goes low, U9-4 goes low, and the shift-register
outputs are latched.  Q1 on U2 is then high for the 12.5 kHz
mode, and low for the 25 kHz mode.

MAINTENANCE

RECOMMENDED TEST EQUIPMENT

The following test equipment is required to test the IF

Module.

1. FM Signal Generator; HP 8640B, HP 8657A, or

equivalent

2. AF Generator or Function Generator

3. Audio Analyzer; HP 8903B, HP 339A, or equivalent

4. Oscilloscope

5. Frequency Counter; Racal-Dana 9919 or equivalent

6. DC Meter for troubleshooting

7. Power Supply; 13.8 Vdc @ 150 mA

8

Power Supply; 12 Vdc @20 mA

ALIGNMENT PROCEDURE

1. Apply 13.8 Vdc and 12 Vdc supplies to module.

2. Verify 13.8 V DC current consumption is between 90

and 150 mA, and 12 Vdc current is between 12 and 18
mA.

3. Verify fault output is 0 to 0.5 Vdc and front panel LED

is off.

21.4 MHz IF MODULE - BLOCK DIAGRAM

LBI-39123E

2

Содержание 19D902783G1

Страница 1: ...rovides ampli fication and demodulation of the 21 4 MHz Intermediate Frequency signal The IF Module also includes the re ceiver squelch circuitry However it does not include de emphasis or squelch aud...

Страница 2: ...ector and is not externally available A received signal strength indicator RSSI is provided at U3 Pin 13 This indicator signal is generated within the limiter circuitry and provides an output current...

Страница 3: ...ages on U6 2 U1 U2 and U3 respectively R29 and R30 comprise a voltage divider to provide a 5 volt logic level output A fault is indicated when the output drops to zero Diode D1 and transistor Q3 monit...

Страница 4: ...nput Check for AF noise C29 200mV Check for AF noise U6 Pin 8 1 V U3 or associated components U6 or associated components Noise only no demodulated audio Check crystal oscillator TP3 50 mVpk 20 945 MH...

Страница 5: ...RECEIVER IF MODULE 19D902494G1 OUTLINE DIAGRAM 19D902494 Sh 1 Rev 5B 19D902493 Comp Side Rev 5 LBI 38643C 4...

Страница 6: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE 19D902494G1 19D902504 Sh 1 Rev 6 LBI 38643C 5...

Страница 7: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE 19D902494G1 19D902504 Sh 2 Rev 6 LBI 38643C 6...

Страница 8: ...CW sim to Sprague 293D C32 thru C34 19A702052P26 Ceramic 0 1 F 10 50 VDCW SYMBOL PART NO DESCRIPTION C35 19A705205P2 Tantalum 1 F 16 VDCW sim to Sprague 293D C36 19A705205P5 Tantalum 6 8 F 10 VDCW sim...

Страница 9: ...ari able resistor VR1 U8 was 19A704971P11 8 Vdc sim to MC78L08ACD VR1 was 19A705496P5 20K ohms 0 1w sim to Murata RGV4E203 Rev B 19D902494G1 25 kHz IF Module Board To change Squelch Driver operation t...

Страница 10: ...A U4 U5 19A704125P1 Quad Comparator U6 U7 19A701789P4 Quad Op Amp U8 19A704971P10 Voltage Regulator U3 19A149980P2 FM Receiver U1 344A3740P1 Silicon Bipolar IC U2 19A705927P1 Silicon Bipolar IC LBI 38...

Страница 11: ...ER 2 LOOP BUFFER AMPLIFIERS 2 AUDIO FREQUENCY AMPLIFIER 2 VOLTAGE REGULATORS 2 LOGIC CIRCUITS 3 BLOCK DIAGRAM 2 MAINTENANCE 3 TEST PROCEDURE 3 ALIGNMENT PROCEDURE 3 TROUBLESHOOTING 3 PARTS LIST 4 PROD...

Страница 12: ...frequency doubler Tank elements L802 C812 C814 and L803 form a resonant circuit and matching net work to drive resistive splitter R201 R204 RF AMPLIFIERS The RF chain begins with resistive splitter R2...

Страница 13: ...of the audio modulation and the buffered error signal The output of the second buffer U501B is applied to a loop filter consisting of R506 R507 R508 C505 and C506 This filter controls the bandwidth an...

Страница 14: ...z average deviation de emphasis on Verify 55dB 7 Measure AF response at 300 Hz 1 kHz ref and 3 kHz de emphasis off Verify within 1 5 dB with respect to 1 kHz reference 8 Verify lock at different frequ...

Страница 15: ...50 VDCW temp coef 0 and or 30 PPM C C14 C15 19A700004P6 Metallized polyester 4 7 uF or 10 63 VDCW C16 19A702052P106 Ceramic 1500 pF or 5 50 VDCW C17 19A702061P99 Ceramic 1000 pF or 5 50 VDCW temp coef...

Страница 16: ...ilm 75 ohms or 5 1 8 w R210 19B800607P331 Metal film 330 ohms or 5 1 8 w R211 19B800607P120 Metal film 12 ohms or 5 1 8 w Used in G9 G10 R211 19B800607P150 Metal film 15 ohms or 5 1 8 w Used in G3 G6...

Страница 17: ...19A700004P2 C16 was 330 pF 19A702061P73 REV A TRANSMITTER SYNTHESIZER BOARD 19D902779G9 REV B TRANSMITTER SYNTHESIZER BOARD 19D902779G8 REV C TRANSMITTER SYNTHESIZER BOARD 19D902779G3 G6 G7 To meet h...

Страница 18: ...TA U401 19A149944P201 Dual Modulus Prescaler U402 19B800902P5 Synthesizer U502 19A702705P4 Quad Analog Switch U701 U705 19A703483P302 Quad 2 Input NAND Gate U702 19A703471P120 Address Decoder LBI 3867...

Страница 19: ...OUTLINE DIAGRAM UHF TRANSMITTER SYNTHESIZER BOARD 19D902779G3 G6 G10 SOLDER SIDE COMPONENT SIDE 19D902779 Sh 2 Rev 9 19D903361 Layer 1 4 Rev 0 LBI 38671H 8...

Страница 20: ...SCHEMATIC DIAGRAM UHF TRANSMITTER SYNTHESIZER 19D902780G3 G6 G10 19D903363 Sh 1 Rev 10 LBI 38671H 9...

Страница 21: ...SCHEMATIC DIAGRAM UHF TRANSMITTER SYNTHESIZER 19D902780G3 G6 G10 19D903363 Sh 2 Rev 10 LBI 38671H 10...

Страница 22: ...SCHEMATIC DIAGRAM UHF TRANSMITTER SYNTHESIZER 19D902780G3 G6 G10 19D903363 Sh 3 Rev 10 LBI 38671H 11...

Страница 23: ...tal oscil lator TCXO operating at 12 8 MHz The oscillator has a stability of 1 0 ppm over the temperature range of 30 C to 75 C The multiplier output is sampled by the resistive splitter and condition...

Страница 24: ...Hz G8 380 400 MHz 470 6 MHz 490 6 MHz G10 492 512 MHz 391 4 MHz 421 4 MHz G12 370 390 MHz 2 MHz 3 MHz 6 25 kHz FREQUENCY STABILITY LO POWER OUTPUT LO NOMINAL IMPEDANCE PHASE NOISE 25 kHz Offset HUM AN...

Страница 25: ...ernal use PRESCALER AND SYNTHESIZER IC The integrated circuit U6 is the heart of the synthesizer It contains the necessary frequency dividers and control circuitry to synthesize output frequencies by...

Страница 26: ...und the ENABLE TEST line pin 22A Apply 4 Vdc to the V_TUNE line pin 26A Measure the frequency of the free running multiplied oscillator at the LO OUT port J2 Adjust the trimmer capacitor C52 for 445 M...

Страница 27: ...digital control circuitry Troubleshoot using standard procedures Ensure all programming signals are present at J1 CLOCK DATA ENABLE A0 A1 and A2 If reference oscillator and programming signals are pr...

Страница 28: ...OUTLINE DIAGRAM UHF RECEIVER SYNTHESIZER BOARD 19D902664G3 G7 G8 G10 G12 COMPONENT SIDE 19D902664 Sh 2 Rev 4 19D902665 Layer 1 Rev 1 LBI 38672J 5...

Страница 29: ...pF or 5 50 VDCW temp coef 0 or 30 PPM C C68 19A702061P99 Ceramic 1000 pF or 5 50 VDCW temp coef 0 or 30 PPM C C69 19A702061P99 Ceramic 1000 pF or 5 50 VDCW temp coef 0 or 30 PPM C C70 19A702061P61 Cer...

Страница 30: ...7P103 Metal film 10K ohms or 5 1 8 w R51 19B800607P103 Metal film 10K ohms or 5 1 8 w R52 19B800607P473 Metal film 47K ohms or 5 1 8 w R53 19B800607P473 Metal film 47K ohms or 5 1 8 w R54 19B800607P47...

Страница 31: ...ru U4 19A705927P1 Silicon Bipolar IC U8 U9 19A702293P3 Dual Operational Amplifier U5 19A149944P201 Modulus Prescaler U14 19A702705P4 Quad Analog Switch U10 19A703471P120 Decoder Demux U12 U13 19A70348...

Страница 32: ...IC DATA U16 19A704971P10 8V Regulator U15 19A704971P8 5V Regulator Y1 19B801351P12 Crystal Oscillator LBI 38672J 9...

Страница 33: ...ASSEMBLY DIAGRAM RECEIVER SYNTHESIZER MODULE 19D902781G3 G7 G8 G10 G12 19D902781 Sh 2 Rev 5 LBI 38672J 10...

Страница 34: ...SCHEMATIC DIAGRAM RECEIVER SYNTHESIZER MODULE 19D902664G3 G7 G8 G10 G12 19D904091 Sh 1 Rev 9A LBI 38672J 11...

Страница 35: ...SCHEMATIC DIAGRAM RECEIVER SYNTHESIZER MODULE 19D902664G3 G7 G8 G10 G12 19D904091 Sh 2 Rev 9A LBI 38672J 12...

Страница 36: ...SCHEMATIC DIAGRAM RECEIVER SYNTHESIZER MODULE 19D902664G3 G7 G8 G10 G12 19D904091 Sh 3 Rev 9A LBI 38672J 13...

Страница 37: ...2782G3 G4 G7 DESCRIPTION The Receiver Front End RXFE Module amplifies and converts the Rf signal to the first IF signal of 21 4 MHz This is a down conversion process using low side G3 G4 or high side...

Страница 38: ...ith a constant voltage and current source The bias on Q3 and Q8 is monitored by the Fault Detector circuit via R21 and R31 respectively Capaci tors C22 C23 and C26 prevent the RF component from enteri...

Страница 39: ...frequency tuning The swept frequency tuning can be done using a Spectrum Analyzer and Tracking Generator With proper Injection power and current drain the frequency response of the Preselector Filter...

Страница 40: ...ed in G7 L19 19A705470P3 Coil fixed 15 nH sim to Toko 380NB 15nM L20 19A705470P24 Coil Fixed 0 82 H sim to Toko 380NB R82M SYMBOL PART NUMBER DESCRIPTION C13 19A702061P13 Ceramic 10 pF 5 50VDCW temp c...

Страница 41: ...prove receiver sensitivity L8 changed from 18nH 19A705470P4 to 33nH 19A705470P7 R5 changed from 10 ohms 19B800607P100 to 0 ohms 19B800607P1 R14 changed from 18 ohms 19B800607P180 to 27 ohms 19B800607P...

Страница 42: ...RECEIVER FRONT END BOARD 19D902490G4 G7 OUTLINE DIAGRAM 19D902490 Sh 4 Rev 6A LBI 38673F 5...

Страница 43: ...ASSEMBLY DIAGRAM RECEIVER FRONT END MODULE 19D902782G3 19D902782 Sh 1 Rev 6 LBI 38673F 6...

Страница 44: ...ASSEMBLY DIAGRAM RECEIVER FRONT END MODULE 19D902782G4 G7 19D902782 Sh 2 Rev 6 LBI 38673F 7...

Страница 45: ...SCHEMATIC DIAGRAM RECEIVER FRONT END MODULE 19D902782G4 G7 19D904768 Sh 1 Rev 6 LBI 38673F 8...

Страница 46: ...SCHEMATIC DIAGRAM RECEIVER FRONT END MODULE 19D902782G3 G4 G7 19D904768 Sh 2 Rev 6 LBI 38673F 9...

Страница 47: ...SCHEMATIC DIAGRAM RECEIVER FRONT END MODULE 19D902782G3 19D903498 Rev 7 LBI 38673F 10...

Страница 48: ...This page intentionally left blank LBI 38673F 11...

Страница 49: ...TA 11 OUTLINE DIAGRAM 10 12 SCHEMATIC DIAGRAM 11 12 LOW PASS FILTER 7 13 MAINTENANCE MANUAL FOR 450 470 MHz 110 WATT POWER AMPLIFIER 19D902797G3 425 450 MHz 90 WATT POWER AMPLIFIER 19D902797G7 403 425...

Страница 50: ...400 mW Low Level Amplifier U102 The Low Level Amplifier LLA stage uses a 50 ohm thick film RF Power Module to amplify and control of the output power Internally the module is a three stage ampli fier...

Страница 51: ...e control voltage as necessary If Vr increases at U3 1 beyond the preset threshold an increase at U3 4 will result This causes a subsequent reduction in the control voltage to U1 Thus the power contro...

Страница 52: ...s DC G3 G6 G7 G8 G9 G10 G11 7 10 Volts 6 8 Volts 6 8 Volts 6 8 Volts 6 8 Volts 6 8 Volts 6 8 Volts 6 8 Volts 6 8 Volts 6 8 Volts 6 8 Volts 6 8 Volts 4 6 Volts 6 8 Volts 6 8 Volts 6 8 Volts 6 8 Volts 6...

Страница 53: ...LATOR J104 450 470 110W 65 130W 75W 100W 70W 425 450 90W 55 110W 60W 82W 55W 403 425 90W 55 110W 60W 82W 55W 380 400 75W 45 90W 50W 68W 47W 410 430 90W 55 110W 60W 82W 55W 470 494 90W 55 110W 60W 82W...

Страница 54: ...ASSEMBLY DIAGRAM POWER AMPLIFIER ASSEMBLY 19D902797G3 G6 G7 G8 G9 G10 G11 19D902797 Sh 3 Rev 10 LBI 38674F 5...

Страница 55: ...ASSEMBLY DIAGRAM POWER AMPLIFIER ASSEMBLY 19D902797G3 G6 G7 G8 G9 G10 G11 19D902797 Sh 2 Rev 10 COVER ASSEMBLY 19B801659G3 19B801659 Sh 2 Rev 3 LBI 38674F 6...

Страница 56: ...ASSEMBLY DIAGRAMS LOW PASS FILTER MODULE 19D902856G3 19D902856 Sh 1 Rev 0 LBI 38674F 7...

Страница 57: ...7 pF 2 100 VDCW Used in G8 and G11 C68 19A700006P50 Mica teflon 39 pF 2 100 VDCW Used in G6 G7 and G11 C68 19A700006P48 Mica teflon 33 pF 2 100 VDCW G3 SYMBOL PART NO DESCRIPTION C68 and C69 19A700006...

Страница 58: ...al W10 19B801937P1 Power cable W13 19B801739P1 Power control cable MISCELLANEOUS 2 19D902420P6 Heatsink 5 19A702381P510 Screw thread forming TORX DRIVE No M3 5 0 6 x 10 6 7139898P3 Nut hex brass No 1...

Страница 59: ...R53 R55 REV A POWER AMPLIFIER 19D902797G6 To update PWB to new band splits REV A POWER AMPLIFIER 19D902797G7 POWER AMPLIFIER BOARD 19D902794G7 To update PWB to new band splits and add power monitor c...

Страница 60: ...SCHEMATIC DIAGRAM POWER AMPLIFIER ASSEMBLY 19D902797G3 G6 G7 G8 G9 G10 G11 19D903622 Sh 1 Rev 11 LBI 38674F 11...

Страница 61: ...pF 43 0 pF 39 0 pF 33 0 pF 33 0 pF 51 0 pF C89 51 0 pF 51 0 pF 43 0 pF 39 0 pF 33 0 pF 33 0 pF 51 0 pF C90 56 0 pF 47 0 pF 43 0 pF 39 0 pF 33 0 pF 33 0 pF 47 0 pF C91 51 0 pF 47 0 pF 36 0 pF 33 0 pF 3...

Страница 62: ...C DATA U1 19A705457P1 P2 AND P4 PA Amplifier Module U3 19A701789P4 Quad Op Amp U100 19A705532P2 Voltage Regulator U7 344A3907P1 MMIC Amplifier LOW PASS FILTER MODULE 470 512 MHz 19D902856G9 19B804157...

Страница 63: ...nual MASTR III RF PACKAGE UHF 380 512 MHz TABLE OF CONTENTS TRANSMIT SYNTHESIZER LBI 38671 RECEIVE SYNTHESIZER LBI 38672 RECEIVE RF MODULE LBI 38673 LBI 39129 IF MODULE LBI 38643 LBI 39123 POWER AMPLI...

Страница 64: ...made by Ericsson Inc at any time and without notice Such changes will be incorporated into new editions of this manual No part of this manual may be reproduced or transmitted in any form or by any mea...

Страница 65: ...r 50 Hz Power Supply Duplexer Antenna Relay VHF UHF Combiner Isolator Squelch Operated Relay Remote Controllers Battery Standby VHF UHF Battery Charger VHF UHF Gel Cell Battery VHF UHF Voice Guard Enc...

Страница 66: ...REGULATORY DATA EDACS and CONVENTIONAL FCC FILING DATA for cabinet or open rack mounting FREQUENCY BAND POWER OUTPUT Internally Adjustable FREQ STABILITY AND MODULATION TYPE APPLICABLE TO FCC RULES PA...

Страница 67: ...IDITY EIA 90 50o C 122o F INPUT POWER SOURCE 120 VAC 20 or Optional 230 VAC 15 50 Hz Standby Battery Source 13 8 VDC 100 AH min ANTENNA CONNECTIONS Type N LENGTH OF AC POWER CABLE 10 ft 3048mm METERIN...

Страница 68: ...12 5 kHz 25 kHz 380 400 403 430 425 450 450 470 470 494 492 512 50 12 5 25 115 0 40 V 118 0 28 V 80 90 50 12 5 25 116 0 35 V 119 0 25 V 80 90 50 12 5 25 116 0 35 V 119 0 25 V 80 90 50 12 5 25 116 0 3...

Страница 69: ...in 1 and 3 dB of 6 dB octave Line Output 300 to 3000 Hz per EIA AUDIO OUTPUT 1 Watt at less than 3 distortion 1000 Hz 25 kHz Channel MODULE NUMBERS TRANSMIT SYNTHESIZER 450 470 MHz 19D902780G3 425 450...

Страница 70: ...19D902797G7 403 425 MHz 19D902797G6 410 430 MHz 19D902797G11 380 400 MHz 19D902797G8 470 494 MHz 19D902780G9 492 512 MHz 19D902780G10 LOW PASS FILTER 19D902856G1 470 512 MHz 19D902780G9 ANTENNA SWITCH...

Страница 71: ...ACCESSORIES ANTENNA SWITCH 19B235897P2 LBI 38675E 9...

Страница 72: ...Ericsson Inc Private Radio Systems Mountain View Road Lynchburg Virginia 24502 1 800 528 7711 Outside USA 804 592 7711 Printed in U S A LBI 38675E...

Страница 73: ...Filter 2 Noise Detector 2 DC Amplifier 2 Schmitt Trigger 2 FAULT DETECTOR 2 VOLTAGE REGULATOR 2 ADDRESS DECODER 2 MAINTENANCE 2 RECOMMENDED TEST EQUIPMENT 2 ALIGNMENT PROCEDURE 2 TROUBLESHOOTING 3 AS...

Страница 74: ...AD signal to a maximum of about 4 8 Vdc for a high signal level 70 dB stronger than that required for 12 dB SINAD The quadrature detector provides a demodulated audio frequency output The input to the...

Страница 75: ...tput A fault is indicated when the output drops to zero Diode D1 and transistor Q3 monitor the output of the 8V regulator DI is a 8 2 volt breakdown diode If the regulator output voltage should rise a...

Страница 76: ...RRECT READING INDICATES DEFECTIVE COMPONENT Fault indicator on Check DC voltages 8V at U8 Pin 1 4v at U6 Pin 7 5 5V at U1 output pin 6V at U3 Pin 5 If DC voltages not correct U8 or associated componen...

Страница 77: ...OUTLINE DIAGRAM RECEIVER IF MODULE EARLIER VERSION 19D902494G7 G11 19D902494 Sh 3 Rev 6 RECEIVER IF MODULE 19D902494G7 G11 19D902494 Sh 4 Rev 6 LBI 39123E 4...

Страница 78: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE EARLIER VERSION 19D902494G7 G11 188D5586 Sh 1 Rev 3 LBI 39123E 5...

Страница 79: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE EARLIER VERSION 19D902494G7 G11 188D5586 Sh 2 Rev 3 LBI 39123E 6...

Страница 80: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE 19D902494G7 G11 193D1065 Sh 1 Rev 3 LBI 39123E 7...

Страница 81: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE 19D902494G7 G11 193D1065 Sh 2 Rev 3 LBI 39123E 8...

Страница 82: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE 19D902494G7 G11 193D1065 Sh 3 Rev 3 LBI 39123E 9...

Страница 83: ...U1 344A3740P1 Silicon Bipolar IC U3 19A705535P3 FM Receiver U4 U5 19A704125P1 kQuad Comparator U6 U7 19A701789P4 Quad Op Amp U8 19A704971P10 Voltage Regulator U11 RYT3066018 C Bilateral Switch LBI 39...

Страница 84: ...Metal filter 2 7 K ohms 5 1 8 w Used in G11 R2 19B800607P332 Metal film 3 3K ohms 5 1 8 w R3 19B800607P103 Metal film 10K ohms 5 1 8 w R4 19B800607P102 Metal film 1K ohms 5 1 8 w R5 19B800607P103 Meta...

Страница 85: ...G10 G11 G12 DESCRIPTION The Receiver Front End RXFE Module amplifies and converts the RF signal to the first IF at 21 4 MHz This is a down conversion process using low side G9 G10 or high side G6 G8...

Страница 86: ...e Injection Amplifier output signal is coupled to the Injection Filter via an impedance matching network consisting of C8 L13 and resistors R15 and R16 INJECTION FILTER Following the Injection Amplifi...

Страница 87: ...0 dBm into the LO IN connector J3 LO frequency RF frequency 21 4 MHz for groups G9 G10 or LO frequency RF frequency 21 4 MHz for groups G6 G8 G11 G12 4 Preset the height of slugs with respect to the...

Страница 88: ...705470P14 Coil fixed 0 12 uH sim to Toko 380NB R12M Used in G6 and G11 L9 19A705470P1 Coil fixed 10 nH sim to Toko 380NB 10nM Used in G10 L10 19A705470P16 Coil fixed 0 18 nH sim to Toko 380NB R18M L11...

Страница 89: ...OUTLINE DIAGRAM U1 19A704125P1 Quad Operational Amplifier 19D902490 Sh 7 Rev 5 RECEIVER FRONT END BOARD 19D902490G6 G8 G12 LBI 39129B 4...

Страница 90: ...ASSEMBLY DIAGRAM RECEIVER FRONT END MODULE 19D902782G6 G8 G12 19D902782 Sh 2 Rev 3 LBI 39129B 5...

Страница 91: ...SCHEMATIC DIAGRAM RECEIVER FRONT END MODULE 19D902782G6 G8 G12 188D5789 Sh 1 Rev 6A LBI 39129B 6...

Страница 92: ...SCHEMATIC DIAGRAM RECEIVER FRONT END MODULE 19D902782G6 G8 G12 188D5789 Sh 2 Rev 6A LBI 39129B 7...

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