HARRIS TR-0017-E Sitepro Base Station User Manual RX IF

HARRIS CORPORATION Sitepro Base Station RX IF

RX IF

Maintenance ManualMM101886V1 R1A21.4 MHz RECEIVER IF MODULE12.5/25 kHz CHANNEL SPACINGCB101128V1TABLE OF CONTENTS Page 1.0 SPECIFICATIONS................................................................................................................................................. 32.0 DESCRIPTION ...................................................................................................................................................... 43.0 CIRCUIT ANALYSIS............................................................................................................................................ 53.1 INPUT AMPLIFIER NETWORK...................................................................................................................... 53.2 CRYSTAL FILTERS, IF AMPLIFIER.............................................................................................................. 53.3 INTEGRATED CIRCUIT AGC AMPLIFIER................................................................................................... 53.4 OSCILLATOR/MIXER/DETECTOR................................................................................................................ 63.5 AUDIO AMPLIFIER ......................................................................................................................................... 63.6 SQUELCH.......................................................................................................................................................... 73.6.1 Buffer Amplifier ............................................................................................................................................. 73.6.2 Bandpass Filter ............................................................................................................................................... 83.6.3 Noise Detector ................................................................................................................................................ 83.6.4 DC Amplifier .................................................................................................................................................. 83.6.5 Schmitt Trigger............................................................................................................................................... 83.7 FAULT DETECTORS ....................................................................................................................................... 83.8 VOLTAGE REGULATORS .............................................................................................................................. 93.9 ADDRESS DECODER ...................................................................................................................................... 94.0 MAINTENANCE ................................................................................................................................................. 104.1 RECOMMENDED TEST EQUIPMENT......................................................................................................... 104.2 ALIGNMENT PROCEDURE.......................................................................................................................... 104.3 CRYSTAL FILTER TUNING ......................................................................................................................... 114.3.1 Tuning FL1 and FL2..................................................................................................................................... 114.3.2 Tuning FL3 and FL4..................................................................................................................................... 114.4 AUDIO AND DATA OUTPUT ADJUSTMENTS.......................................................................................... 114.5 TROUBLESHOOTING.................................................................................................................................... 115.0 ASSEMBLY DIAGRAM..................................................................................................................................... 136.0 PARTS LIST ........................................................................................................................................................ 147.0 IC DATA .............................................................................................................................................................. 238.0 OUTLINE DIAGRAM......................................................................................................................................... 309.0 SCHEMATIC DIAGRAM ................................................................................................................................... 31
2MM101886V1 R1AThis manual is published by M/A-COM Private Radio Systems, Inc., without any warranty. Improvements and changes to this manualnecessitated by typographical errors, inaccuracies of current information, or improvements to programs and/or equipment, may be made byM/A-COM Private Radio Systems, Inc., at any time and without notice. Such changes will be incorporated into new editions of thismanual. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, includingphotocopying and recording, for any purpose, without the express written permission of M/A-COM Private Radio Systems, Inc.Copyright© 2002, M/A-COM Private Radio Systems, Inc. All rights reserved.NOTEThis device made under license under one or more of the following US patents: 4,590,473; 4,636,791; 5,148,482; 5,185,796;5,271,017; 5,377,229.NOTEThe voice coding technology embodied in this product is protected by intellectual property rights including patent rights,copyrights, and trade secrets of Digital Voice Systems, Inc. The user of this technology is explicitly prohibited fromattempting to decompile, reverse engineer, or disassemble the Object Code, or in any other way convert the Object Code intohuman-readable form.
SPECIFICATIONSMM101886V1 R1A 31.0 SPECIFICATIONS1Item SpecificationI.F. (Intermediate Frequency) 21.4 MHzInput Impedance 50 ohml2 dB SINAD ≤-120 dBm (25 kHz); ≤-119 dBm (12.5 kHz)Adj. CH Rejection ≥85 dB (25 kHz); ≥80 dB (12.5 kHz)Image Rejection ≥100 dBIntermodulation Rejection ≥83 dB (25 kHz); ≥78 dB (12.5 kHz)Signal Displacement Bandwidth ≥2 kHz (25 kHz); ≥1 kHz (12.5 kHz)2nd I.F. (Intermediate Frequency) 455 kHz455 kHz Balanced Output Level 2.2 V PP per line, adjustable2nd L.O. Frequency 20.945 MHzAF Output (J2, Pin 31C) 1 Vrms adjustable (with standard input signal)AF Output Impedance 1k ohmAF Distortion ≤3% (25 kHz); ≤5% (12.5 kHz)AF Response10 Hz ≥-3 dB ref.300 Hz ±1 dB ref.1000 Hz 0 dB reference3 kHz (25 kHz Channel) ±1.6 dB ref.3 kHz (12.5 kHz Channel) ± 2.5 dB ref.Hum & Noise Rejection ≥55 dB (25 kHz); ≥50 dB (12.5 kHz)RSSI Output (J2, Pin 20C) 0.7 to 2.7 VDCRSSI Time Constant 5 msSQ Threshold Sensitivity ≤-123 dBm (25 kHz); ≤-122 dBm (12.5 kHz)SQ Maximum Sensitivity ≤-110 dBm (25 kHz); ≤-109 dBm (12.5 kHz)SQ Clipping 3 kHzSQ Attack 150 msSQ Close 250 msSQ Output (J2, Pin 26C) 5V logic (low = squelched)Fault Output (J2, Pin 11C) 5V logic (low = fault)AGC Range 50 dBDC Supply 13.8V, 80 mA max.; 12.0V, 65 mA max. 1 These specifications are intended to be used by the service technician during servicing. Refer to the appropriateSpecification Sheet for the complete Specification.
DESCRIPTION4MM101886V1 R1A2.0 DESCRIPTIONThe MASTR III Receiver IF Module 19D902783G7/G11 provides amplification anddemodulation of the 21.4 MHz Intermediate Frequency (IF) signal as well as AutomaticGain Controlled (AGC) 455 kHz outputs to the DSP Modem module(Figure 1 - 21.4MHz Receiver IF Module). The IF Module also includes the receiver squelch circuitry.However, it does not include de-emphasis or squelch audio gating circuits. Figure 2 –21.4 MHz IF Module Block Diagram shows the functional operation of the IF Module. The IF Module circuitry contains the following:•A 50 ohm input impedance IF Amplifier•A chain of four crystal filters and IF amplifier• A two stage AGC amplifier• A two stage balanced output IF amplifier•An integrated circuit containing a crystal oscillator, mixer, limiter, and quadraturedetector•A variable gain AF amplifier•A squelch circuit•A fault detector circuit•An integrated circuit voltage regulator•An address decoderFigure 1 - 21.4 MHz Receiver IF Module
CIRCUIT ANALYSISMM101886V1 R1A 53.0 CIRCUIT ANALYSIS 3.1 INPUT AMPLIFIER NETWORK The input amplifier consisting of transistor Q1 and transformer TX1, provides a 50 ohmload for the receiver IF module.Capacitor C1 provides AC coupling and a DC block on the input line (J1). This DC blockprotects the module in the event of a failure in a preceding module.Capacitor C1 and inductor L1 are series-resonant at 21.4 MHz and provide a low-impedance path from J1 to amplifier transistor Q1. Capacitor C2 and inductor L2 areparallel-resonant at 21.4 MHz and provide a path to the 50-ohm load, resistor R1, formixer products other than 21.4 MHz.3.2 CRYSTAL FILTERS, IF AMPLIFIERCrystal Filters FL1, FL2, FL3 and FL4, transistor Q2 circuit, and associated circuitryprovide IF filtering and amplification at 21.4 MHz. Filters FL1 and FL2 are two polecrystal bandpass filters centered at 21.4 MHz with a typical combined 6 dB bandwidth of±7.0 kHz. The loss of FL1 and FL2 combined is typically between 2.5 and 3.5 dB. Whencombined, the filter set has associated matching networks to match the combination to a50-ohm input and output impedance. FL3 and FL4 are matched to a 50-ohm inputimpedance and a 470 ohm output impedance. The FL1 and FL2 pair is specified to haveespecially good intermodulation performance to meet the overall requirements for themodule.3.3 INTEGRATED CIRCUIT AGC AMPLIFIERThe first two stages of AGC Amplifier U100 consist of two IF amplifiers whose gain canbe controlled with an AGC voltage. These two amplifiers are connected in cascade tocombine their gains. The combined voltage gain varies from about 35 dB at an AGCvoltage of 3.5 VDC down to about –25 dB at an AGC voltage of <1.5 VDC. The AGCvoltage is supplied by the DSP Modem module. In the two level FM mode, when no DSPmodem is present, the AGC voltage is set to a fixed voltage of 3.5 volts by voltagedivider resistors R139 and R137 to set the cascaded AGC amplifier gain to maximum.The output of the second IF amplifier in U100 feeds the 21.4 MHz IF signal to the inputof U101 through a matching network consisting of inductor L101 and capacitor C123.The matching network matches the output impedance of the second IF amplifier in U100to resistor R103.The video amplifier has a single ended voltage gain (from the input to one output) offrom 25 to 43 dB. The gain is set in this range by adjusting resistor R100. The differentialgain is 6 dB higher than the single ended gain. The input of this stage comes from the ICmixer U101 output by way of 455 kHz filter FL100. Filter FL100 has a 6 dB bandwidthof ±7.5 kHz to reduce the level of adjacent channel signals passing into the DSP Modemmodule. The differential output of the video amplifier is routed to U105, and then to theDSP Modem module via the Backplane board.
CIRCUIT ANALYSIS6MM101886V1 R1A3.4 OSCILLATOR/MIXER/DETECTOR Integrated circuit U101 performs several functions. The 20.945 MHz crystal oscillatorprovides local oscillator injection to the mixer in U101. This mixer converts the 21.4MHz IF signal to 455 kHz. Capacitors C119 and C120 are oscillator feedback capacitorsand have been chosen to provide the proper capacitance for crystal Y100. The frequencycan be adjusted by means of L102. The proper oscillator output level is difficult tomeasure directly without affecting the circuit operation. The level at TP3 should beapproximately 50 mVpk (Measured using a 10 megohm, 1lpF oscilloscope probe).The mixer is internally connected to the crystal oscillator. Pins 1 and 20 of U101 are themixer input and output respectively. Typical mixer conversion voltage gain isapproximately 12 dB. The mixer output feeds the transistor Q100 IF amplifier circuit andeach analog switch, U102 and U103. The output from Q100 is routed to ceramic filterFL100. In the 12.5 kHz bandwidth mode, analog switches U102 and U103 route the 455kHz IF through FL101 to the U101 IF amplifier input. In the 25 kHz mode, the mixeroutput is switched around FL101 by U102 and U103 and is then routed to the IFamplifier input. In the four level FM mode, FL101 is bypassed as in the 25 kHz two levelmode. Ceramic filters FL101 and FL102 have a minimum 6dB bandwidth of 455 kHz±6kHz.The IF amplifier input is U101, Pin 18. The output at U101, Pin 16 is passed through anattenuator consisting of resistors R143, R144, and R145 to ceramic bandpass filterFL102, then to the limiter input at U101, Pin 14. The limiter output drives one input ofthe quadrature detector via capacitor C129. A Received Signal Strength Indicator (RSSI) is provided at U101, Pin 7. This indicatorsignal is generated within the limiter circuitry and provides an output current proportionalto the logarithm of the input signal strength. This current develops a voltage acrossresistor R141. The voltage varies from about 1.6 VDC for noise input, to about 2.4 VDCfor a 12 dB SINAD signal, to a maximum of about 4.7 VDC for a –75 dBm IF inputsignal at J1. RSSI Buffer U200A provides buffering to eliminate loading effects on theRSSI line. The RSSI line will provide a constant output level above a –75 dBm IF inputlevel, since the input to U101 is held constant by AGC from the DSP Modem module.The quadrature detector provides a demodulated audio frequency output. One input to thedetector is internally connected to the limiter and is not externally available. The outputof the detector is at U101, Pin 9. Capacitor C145 provides lowpass filtering to remove455 kHz feed-through. Ceramic resonator Y101 provides the frequency-selectivecomponent needed for FM demodulation. Y101 replaces the typical LC resonant circuitfound in most quadrature detectors. In contrast to the typical LC network, Y101 requiresno adjustment. In the four level FM mode, the detector output of U101 is not used. Thedetected audio output is derived by other circuitry in the base station.Integrated circuit U101 general: The DC supply to U101 is provided through voltagedropping resistor Rl04 to U101, Pin 6. The voltage drop across resistor R104 is used tomonitor the dc voltage on U101 for fault detection.3.5 AUDIO AMPLIFIER Operational amplifier U200C provides audio frequency amplification. The gain ofU200C is set by associated resistors, including variable resistor R203. Resistor R203allows adjustment of the AF output level to 1 Vrms with a standard input signal to the
CIRCUIT ANALYSISMM101886V1 R1A 7module (1 kHz AF, 3 kHz peak deviation in the 25 kHz mode).The typical amplifier gain is approximately 5. In the 12.5 kHz mode the standarddeviation is 1.5 kHz. To provide the same 1 Vrms output, the gain is increased byshunting resistor R202 with resistor R201 by means of electronic switch U207.Operational amplifier U200B is used as a voltage regulator to provide 6 VDC for biasingU200C.DIPLEXERWB/NBDETECTORRSSI21.4 MHzIF INIF AMP21.4 MHzXTAL FILTERAGC AMPUPC3206AGC IN FROMDSP MODEM455 kHz TODSP MODEMTO FM IF ICSA605 FM IF ICU10121.4 MHzXTAL FILTERIF AMPIF AMP MIXERIF AMP LIMITER AUDIOAMPDATAOUTRSSIOUT455 kHzCER FILTFL101455 kHzCER FILTFL102455 kHzCER FILTBUFER AMPLM6172BUFFER AMPUPC3206C21.4 MHzFM IFIC IN20.945 MHz455kHzRSSIBUFFERQ1 FL1,FL2 Q2 FL3,FL4 U100A,BIF BUFFER AMPQ100FL100 U100CU105AU105BU102 U103U200CU200A+-455 kHzDISCRIMINATORFigure 2 – 21.4 MHz IF Module Block Diagram3.6 SQUELCH3.6.1 Buffer AmplifierBuffer amplifier U200D (Refer to Schematic Diagram WD-CB101128V1, Sh. 3) isconfigured as a unity gain buffer amplifier. Its purpose is to provide a high inputimpedance in order to minimize loading of preceding circuitry.
CIRCUIT ANALYSIS8MM101886V1 R1A3.6.2 Bandpass Filter Bandpass filter U203A, together with its associated circuitry, performs the function of anaudio frequency bandpass filter, centered at 6 kHz with a gain of 2. The purpose of thisfilter is to reject all voice frequencies and allow only demodulated noise to pass. Thefunctioning of the squelch circuit depends upon the presence or absence of this noise.When a signal is being received, i.e. the receiver is “quiet”, the squelch circuit senses theabsence of noise and unsquelches the radio.3.6.3 Noise DetectorNoise detector U203B along with associated components are configured as an amplifier.A single +12 V dc supply powers this op-amp, therefore the output can only be positive.Because the ac noise input goes both positive and negative U203B effectively acts as arectifier with gain. The rectified output of U203B charges capacitors C213 and C214 to anearly constant dc voltage. (Actually the R216-C213,C214 time constant will allow a 5Hz variation.)3.6.4 DC Amplifier DC amplifier U203C is configured as a basic amplifier with a gain of 5.0 in the 25 kHzmode. In the 12.5 kHz mode, the gain is increased by about 6 dB by shunting resistorR218 with resistor R219 by means of transistor switch Q201.3.6.5 Schmitt Trigger Schmitt trigger U203D is configured as an amplifier with positive feedback. Thisarrangement provides hysteresis in the output versus input characteristic. This eliminatesthe possibility of the squelch circuit repeatedly cutting in and out when the input signal isnear a threshold. Resistors R223 and R224 act as a voltage divider to provide a 5 voltlogic level output.3.7 FAULT DETECTORSVoltage comparators U1, U104, and U106 are configured as "window detectors," whichpull the FAULT DETECT line low (approximately 0 volts) if the voltage applied fallsoutside the specified range (window). For example: U106C senses whether the inputvoltage is greater than the upper limit of the window. This limit is set by the voltagedivider R128, R129, and R130 (6.75 VDC). Comparator U106D senses whether the inputis less than the lower limit of the window (4.88 VDC, again set by R128, R129, andR130). Therefore, in this example the window is 4.88 VDC to 6.75 VDC. TheU106C/U106D window detector circuit is used to determine whether the U200D voltageregulator output (+6 VDC) is within this range. The other window detector circuitsmonitor dc operating voltages on transistors Ql and Q2 and integrated circuits U100 andU101 respectively.Resistors R131 and R133 comprise a voltage divider to provide a 5 V logic level output.Also, these resistors act as a pull-up for the open collector comparators. A fault isindicated when the output drops to zero.Diode Dl00 and transistor Q101 monitor the output of the 8 V regulator. Dl is a 8.2 VoltZener diode. If the regulator output voltage should rise above 8.9 V (8.2 + 0.7 base-
CIRCUIT ANALYSISMM101886V1 R1A 9emitter drop) Q101 will turn on and a fault will be indicated. Transistors Q3 and Q4 aredrivers for the front panel LED D2. These are powered from the +13.8VDC supply.Therefore, if the 8V regulator opens, a fault will still be indicated.3.8 VOLTAGE REGULATORS 8V regulator U201 is a monolithic integrated circuit voltage regulator providing 8 VDC(+8V). This powers all 8-volt circuitry in the module with the exception of U100 andQ100. A second 8 volt regulator, U208, supplies 8 VDC (+8VB) to U100 and Q100.5V regulator U202 is a monolithic integrated circuit voltage regulator that provides5VDC to U100, U204, U205, and U206. This regulator operates from the 8 VDCprovided by U201.3.9 ADDRESS DECODERThe address decoder circuit consists of binary-to-octal converter U204, quad or-gateU205, and eight bit shift register U206.When a low (0) is present on the A0 line, and a high (1) on the A1 and A2 lines, U204,Pin 9 provides a low to U205A and U205B. When there is a clock input to U205A and anenable input to U205B, the output of U250C provides a latch clock input to U206, Pin 12,and U205A provides a shift clock input to U206, Pin 11. When U206 is enabled, itdetects the data on the DATA input at Pin 14. Internal flip-flops latch the data to hold theoutput state on Pin 15. Depending on the data, U206, Pin 15 is either high for thenarrowband (12.5 kHz) mode or low for the wideband (25 kHz) mode. A “high” is avoltage greater than 3.5 VDC, and a “low” is a voltage less than 1.0 VDC.3.10 BUFFER AMPLIFIER U105Operational amplifier U105 amplifies the 455kHz output from the video amplifier inU100 to a maximum level of 2.2 V peak-to-peak. The differential output of U105 isrouted to J2, Pins A31 and A32. The differential signal passes through the backplaneboard to the DSP Modem module. Buffer amplifier U105 has a voltage gain ofapproximately 2.
MAINTENANCE10 MM101886V1 R1A4.0 MAINTENANCE4.1 RECOMMENDED TEST EQUIPMENTThe following test equipment is required to test the IF Module1. FM Signal Generator; HP 8640B, HP 8657A, or equivalent2. AF Generator or Function Generator3. Audio Analyzer; HP 8903B, HP 339A, or equivalent4. Oscilloscope5. Frequency Counter; Racal-Dana 9919 or equivalent6. DC Meter for troubleshooting7. Power Supply; 13.8 VDC @ 180 mA8. Power Supply; 12 VDC @40 mA9. M/A-COM Test Box TS101285V114.2 ALIGNMENT PROCEDURE 1. Apply 13.8 VDC and 12 Vdc supplies to the IF module.2. Verify 13.8 VDC current consumption is between 55 and 80 mA, and 12 VDCcurrent is between 45 and 65 mA.NOTEThe currents cannot be measured directly when the TS11285V11 test box is used. Thecurrents can be determined by measuring the voltage drop across L201 and L202 onthe Receiver IF printed wire board and the resistance of each coil. The current can becalculated with the following formula:I = Vdrop/Rcoil3. Set the AGC switch on the test box to "HIGH."4. Verify fault output is 0 to 0.5 VDC and front panel LED is off.5. Apply a standard input signal to the module input (-75 dBm, 21.4 MHz signalmodulated with 1 kHz AF, 3 kHz peak deviation).6. Monitor TP5 with a high-impedance probe connected to the frequency counter.Adjust inductor L102 for a reading of 455 kHz ± 100 Hz.7. Set variable resistor R203 for 1 Vrms ±3% at module output (pin 31C on 96 pinconnector J2).
MAINTENANCEMM101886V1 R1A 114.3 CRYSTAL FILTER TUNING4.3.1 Tuning FL1 and FL21. Connect test equipment as shown in Fig. 10.1.2. Connect the high impedance probe to either side of resistor R152.3. Set the span of the network analyzer to 20 kHz, and the center frequency to 21.4MHz.4. Set the analyzer RF output level to obtain –75 dBm at the input of the module.5. Adjust C9, C12, and C17 for maximum response at 21.4 MHz.4.3.2 Tuning FL3 and FL41. Adjust C24, C29, and C36 for maximum response at 21.4 MHz.2. The 6 dB bandwidth displayed on the network analyzer shall be between fc +/- 6.1and fc +/- 7.3 kHz. The peak-to-valley ripple shall be less than 1 dB.3. If the requirements of step 2 are not met, adjust C9, C12, C17, C24, C29, and C36 asneeded until the requirements are met.NOTEThe bandwidth is controlled primarily by C12 and C29.4. Set the squelch pot on the test fixture to maximum (maximum means to set the wiperfor maximum signal at the Sq-Arm terminal)4.4 AUDIO AND DATA OUTPUT ADJUSTMENTS1. In the 25 kHz mode, apply a standard input signal (-75 dBm, 21.4000 MHz signalmodulated with a 1kHz Audio Frequency (AF), 3kHz peak deviation) to the moduleIF input. Turn the FM modulation off. Monitor TP5 with a high impedance probeconnected to the frequency counter. Adjust L102 for a reading of 455 kHz ±100 Hz.2. Turn the RF generator FM modulation on. Set R203 for 1.0 Vrms ±3% AF output atmodule output (Pin 31C on 96 pin connector, Pin 52).3. Remove the FM modulation from the test signal. Monitor the 455kHz+ jack on thetest box with an oscilloscope using a high-impedance probe. Adjust R100 for a2.2±0.1 volts peak-to-peak level. The 455 kHz-jack shall have a level of 2.2 ± 0.2 Vpeak-to-peak.4.5 TROUBLESHOOTINGWhen troubleshooting the module, it is most convenient if the standard test fixture isused. The following conditions are with the module in the 25 kHz mode. This can be setup using a PC with the necessary software connected to the test box. Alternatively, a wirelink can be soldered between pads H1 and H2 on the PC board.
MAINTENANCE12 MM101886V1 R1AIF amplifier transistor Q2 has a nominal 8 dB gain. Transistor Q2 has a nominal gain of8.5 dB. The mixer has about 14 dB voltage gain with proper LO injection. The propercrystal oscillator level is 10 mV pk measured at TP3. The following four test points are provided on the PWB for additional test capability: TP1: 45 mV pk @ 21.4 MHz with -20 dBm input signal TP3: 10 mV pk @ 20.945 MHz independent of input signal TP4: 20 mV pk @ 455 kHz with -60 dBm input signal TP5: 750 mV pk @ 455 kHz with -75 dBm input signalAll RF voltages measured with 10 Megohm, 11 pF probe.Table 1 - Troubleshooting GuideSYMPTOM CHECK(CORRECT READING SHOWN)INCORRECT READINGINDICATES DEFECTIVECOMPONENTFault indicatoronCheck DC voltages:+8V @ U201, Pin 3+6V @ U200, Pin 71.5V @ Q1 and Q2 (emitters)6V @ U101, Pin 5If DC voltages not correctU201 or associated componentsU200 or associated componentsQ1 and Q2 or associated componentsU101 or associated componentsNo audio - nonoiseWith no signal applied to module IF input:Check for AF noise @ C146; 200mVCheck for AF noise @ U200, Pin 8; 1 VU101 or associated componentsU200 or associated componentsNoise only -nodemodulatedaudioCheck crystal oscillator:TP3, 10 mVpk, 20.945 MHzApply -30 dBm, 21.4 MHz input, check TPl 60 mVpkApply -60 dBm, 21.4 MHz input, check TP4 20 mVpkU101, Y100 or associated componentsQ1, FL1, FL2 or associated componentsQ2, FL3, FL4, Y101, U100 or associatedcomponentsPoor 12 dBSINADCheck crystal oscillator:TP3, 10 mVpk, 20.945 MHzApply -30 dBm, 21.4 MHz input, check TP1, 60 mVpkApply -60 dBm 21.4 MHz input, check TP4, 20 mVpkU101, Y100 or associated componentsQ1, FL1, FL2, Y100, or associated componentsQ2, FL3, FL4, U100, U101 FL102 or associatedcomponentsWith squelch pot maximum, or with module AUDIO/SQUELCH/HI connected to SQUELCH/ARM input andwith no signal to module IF input:Check Presence of 1 Vpk noise @ U200, Pin 14Check presence of 1 Vpk noise U7 @t Pin 12 U200 or associated componentsNo squelchfunctionCheck DC voltage U203 @t Pin 8: 7VCheck DC voltage U203 @ Pin 14: 0.5V U203 or associated components
ASSEMBLY DIAGRAMMM101886V1 R1A 135.0 ASSEMBLY DIAGRAMItem Part Number Description Qty21.4 MHz Receiver IFModule EA101401V1119D902508P1 Chassis 1219D902509P1 Cover 1319D902555P1 Handle 1419A702381P506 Screw, torq 6519A702381P513 Screw, torq 6619B235310P1 NP, Blank 1719B802690P1 Grommet 1819A702381P508 Screw, torq 19CB101128V1 Board, Component 1RECEIVER IF MODULEEA101401V1(AD-EA101401, Rev. A)
PARTS LIST14 MM101886V1 R1A6.0 PARTS LISTMASTR III RECEIVER IF CIRCUIT BOARD ASSEMBLYPL-CB101128V12 Revision: ASymbol Part Number Description- - - - CAPACITORS - - -C1andC2RJC 463 4043/12 120pFC3 RJC 464 2045/47 47nFC4 RJC 464 2045/1 10nFC5 RJC 464 3044/47 4.7nFC6 RJC 464 2045/1 10nFC7andC8RJC 463 6042/15 15pFC9 19A704350P102 3-10pF: MURATAC10 RJC 463 4042/33 33pFC11 RJC 463 9041/27 2.7pFC12 19A704350P102 3-10Pf: MURATAC13 RJC 463 9041/27 2.7pFC14andC15RJC 463 9041/56 5.6pFC16 RJC 463 9041/27 2.7pFC17 19A704350P102 3-10pF: MURATAC18andC19RJC 463 6042/15 15pFC20 RJC 464 2045/1 10nFC21 RJC 464 3044/47 4.7nFC22 RJC 464 2045/47 47nFC23 RJC 464 2045/1 10nFC24 19A704350P102 3-10pF: MURATAC25 RJC 463 4042/33 33pFC26 RJC 463 9041/27 2.7pFC27andC28RJC 463 6042/15 15pFC29 19A704350P102 3-10pF: MURATAC30 RJC 463 9041/27 2.7pFC31 RJC 464 3044/47 4.7nFC32 RJC 463 9041/27 2.7pFC33 RJC 464 3044/47 4.7nFC34 RJC 463 6042/15 15pF 2 COMPONENTS ADDED, DELETED OR CHANGED BY PRODUCTION CHANGES.
PARTS LISTMM101886V1 R1A 15Symbol Part Number DescriptionC35 Not UsedC36 19A704350P102 3-10pFC37 RJC 464 3046/1 100nFC38 RJC 463 4042/1 10pFC39 RJC 463 0041/1 1pFC40thruC99Not UsedC100andC101RJC 464 3045/22 22nFC102 RJC 464 3067/1 1µF.C103 RJC 464 3045/22 22nFC104 RJC 464 3046/1 100nFC105, RJC 464 3045/22 22nFC106 RJC 464 3046/1 100nFC107 RJC 464 3045/22 22nFC108 RJC 464 3044/47 4.7nFC109, RJC 464 3046/1 100nFC110, RJC 464 3067/1 1µFC111 RJC 463 4043/33 330pFC112 RJC 464 3046/1 100nFC113 RJC 463 4044/1 1nFC114 RJC 464 3045/22 22nFC115andC116RJC 464 3046/1 100nFC117 RJC 463 4044/1 1nFC118 Not UsedC119 RJC 463 4043/15 150pFC120 RJC 463 4042/56 56pFC121 RJC 463 0041/1 1pFC122 RJC 464 3046/1 100nFC123andC124RJC 464 2045/1 10nFC125andC126RJC 464 3046/1 100nFC127 19A705205P15 33 µFC128 RJC 464 2045/1 10nFC129 RJC 463 4042/27 27pFC130thruC135RJC 464 3046/1 100nFC136 RJC 463 4044/1 1nF
PARTS LIST16 MM101886V1 R1ASymbol Part Number DescriptionC137andC138RJC 464 3046/1 100nFC139 RJC 463 4042/22 22pFC140thruC144RJC 464 3046/1 100nFC145 RJC 463 4043/1 100pFC146 19A705205P5 6.8µFC147 RJC 464 3046/1 100nFC148 RJC 463 4043/12 120pFC149andC150RJC 464 3046/1 100nFC151andC152RJC 463 6042/15 15pFC153, RJC 463 4042/22 22pFC154andC155RJC 464 3046/1 100nFC156 RJC 463 4042/22 22pFC157 RJC 464 3046/1 100nFC158 RJC 463 4042/22 22pFC159thruC199Not UsedC200 19A705205P111 47µFC201, RJC 464 3067/1 1µFC202 19A705205P2 1µF POLC203 RJC 464 3046/1 100nFC204 19A705205P2 1µF POLC205 RJC 464 3046/1 100nFC206 RJC 464 3067/1 1µFC207 RJC 464 2045/1 10nFC208, RJC 463 4043/1 100pFC209 RJC 464 3044/47 4.7nFC210andC211RJC 464 2045/47 47nFC212 RJC 463 4043/47 470pFC213andC214RJC 464 3046/1 100nFC215 RJC 463 4043/47 470pFC216 RJC 464 3067/1 1µFC217andRJC 463 4043/1 100pF
PARTS LISTMM101886V1 R1A 17Symbol Part Number DescriptionC218C219 RJC 464 3067/1 1µFC220andC221RJC 463 4043/1 100pFC222 19A705205P2 1µF POLC223 RJC 464 3046/1 100nFC224thruC226RJC 463 4043/1 100pFC227 Not UsedC228thruC232RJC 463 4043/1 100pFC233andC234RJC 464 2045/1 10nFC235andC236RJC 464 3046/33 0.33µFC237thruC242RJC 464 2045/1 10nFC243andC244RJC 463 4044/1 1nFC245andC246RJC 464 2045/1 10nFC247 Not UsedC248 RJC 463 4042/33 33pFC249 RJC 464 2045/1 10nFC250 RJC 463 4044/1 1nFC251 Not UsedC252 RJC 463 4042/33 33pF- - - - DIODES - - - -D1 RKZ 323 661/5 SMS7630-005: ALPHA INDD2 19A703595P10 LED: AGILENT TECHD100 19A700083P105 BZX84C8V2/SOT: ON SEMID200 19A700155P2 BAT18: PHILIPS SEMI- - - - FILTERS - - - -FL1andFL2Fl101061V1 21.4 MHz (High IP3 filter set consists of a matchedpair): TEWFL100 VECFUM455E 455 kHz Ceramic Filter: MURATAFL101andFL102VECFUM455F 455 kHz Ceramic Filter: MURATA
PARTS LIST18 MM101886V1 R1ASymbol Part Number Description- - - - CONNECTORS - - - -J1 19A115938P24 BNCJ2 19B801587P7 96 PIN- - - - INDUCTORS - - - -L1andL2REG704593/47 0.47µH: TDKL3andL4REG704594/68 6.8µH: TDKL5andL6VELQS33N1R5G04 1.5µH: MURATAL7andL8REG704594/68 6.8µHL9 VELQS33N1R5G04 1.5µH: MURATAL10 REG 704 14/31 3.3µFL100 REG 704 14/37 10µH.L101 REG 704 593/27 0.27µH: TDKL102 19A703311P1 0.75µH: TokoL103 REG 704 14/37 10µHL201andL202REG 704 14/37 10µH- - - - TRANSISTORS - - - -Q1,Q2 19A704708P2 NE85633: CEL (NEC)Q3andQ419A700076P2 MMBT3904/SOT: ON SEMIQ100andQ10119A700076P2 MMBT3904/SOT: ON SEMIQ201thruQ20319A700076P2 MMBT3904/SOT: ON SEMI- - - - RESISTORS - - - -R1 344A3304P51R1 51.1 OhmsR2 344A3304P1000 100 OhmsR3 344A3304P1002 10k OhmsR4 344A3304P3321 3.32k OhmsR5 344A3304P8250 825 OhmsR6 344A3304P9090 909 OhmsR7 19B801251P5R6 5.62 Ohms
PARTS LISTMM101886V1 R1A 19Symbol Part Number DescriptionR8 344A3304P9090 909 OhmsR9 344A3304P1000 100 OhmsR10 344A3304P1002 10k OhmsR11 344A3304P3321 3.32k OhmsR12 344A3304P8250 825 OhmsR13 344A3304P9090 909 OhmsR14 19B801251P5R6 5.62 OhmsR15 344A3304P9090 909 OhmsR16andR17344A3304P3321 3.2k OhmsR18 344A3304P6811 6.81k OhmsR19 344A3304P1003 100k OhmsR20 344A3304P1502 15k OhmsR21 344A3304P2211 2.21k OhmsR22 344A3304P2741 2.74k OhmsR23 344A3304P4750 475 OhmsR24andR25344A3304P1000 100 OhmsR26andR27344A3304P6811 6.81k OhmsR28thruR34Not UsedR35 Not UsedR36thruR99Not UsedR100 REL 316 1114/1 1K VARR101 344A3304P2000 200 OhmsR102 344A3304P1001 1k OhmsR103 344A3304P51R1 51.1 OhmsR104 344A3304P3320 332 OhmsR105 344A3304P2212 22.1k OhmsR106 19B801251P1 0 OhmsR107 344A3304P2210 221 OhmsR108 344A3304P1503 150k OhmsR109 344A3304P1501 1.5k OhmsR110 344A3304P8250 825 OhmsR111 344A3304P1003 100k OhmsR112 344A3304P1002 10k OhmsR113 344A3304P4321 4.32k OhmsR114 344A3304P3321 3.32k OhmsR115 344A3304P6811 6.81k OhmsR117 344A3304P3321 3.32k Ohms
PARTS LIST20 MM101886V1 R1ASymbol Part Number DescriptionR118 344A3304P6811 6.81k OhmsR119 Not UsedR120 344A3304P1212 12.1k OhmsR121 344A3304P4750 475 OhmsR122 344A3304P2211 2.21k OhmsR123 344A3304P4750 475 OhmsR124 344A3304P8250 825 OhmsR125 344A3304P1002 10k OhmsR126 344A3304P1211 1.21k OhmsR127 344A3304P3921 3.92k OhmsR128 344A3304P1211 1.21k OhmsR129 344A3304P1821 1.82k OhmsR130 344A3304P4751 4.75k OhmsR131 344A3304P8251 8.25k OhmsR132 344A3304P1002 10k OhmsR133 344A3304P1502 15k OhmsR134 344A3304P1003 100k OhmsR135 344A3304P1002 10k OhmsR136 344A3304P6812 68.1k OhmsR137 344A3304P1213 121k OhmsR138 344A3304P1003 100k OhmsR139 344A3304P3322 33.2k OhmsR140 Not UsedR141 344A3304P1003 100k OhmsR142 344A3304P1211 1.21k OhmsR143 344A3304P3321 3.32k OhmsR144 344A3304P2211 2.21k OhmsR145 344A3304P4751 4.75k OhmsR146 344A3304P2670 267 OhmsR147 344A3304P2211 2.21k OhmsR148andR149344A3304P4750 475 OhmsR150andR151Not UsedR152andR15319B801251P1 0 ohm.R154 344A3304P47R5 47.5 OhmsR155 344A3304P4750 475 OhmsR156thruR200Not UsedR201 344A3304P2741 2.74k OhmsR202 344A3304P3321 3.32k OhmsR203 REL 316 1115/2 20K VAR.
PARTS LISTMM101886V1 R1A 21Symbol Part Number DescriptionR204 344A3304P1502 15k OhmsR205thruR207344A3304P1003 100k OhmsR208 344A3304P6811 6.81k OhmsR209 344A3304P1001 1k OhmsR210andR211344A3304P3322 33.2k OhmsR212 344A3304P5622 56.2k OhmsR213 344A3304P8251 8.25k OhmsR214 344A3304P1002 10k OhmsR215 344A3304P1003 100k OhmsR216 344A3304P3323 332k OhmsR217andR218344A3304P1002 10k OhmsR219 344A3304P3922 39.2k OhmsR220andR221344A3304P2212 22.1k OhmsR222 344A3304P6812 68.1k OhmsR223 344A3304P7500 750 OhmsR224 344A3304P8250 825 OhmsR225andR226344A3304P4752 47.5k OhmsR227 344A3304P1002 10k OhmsR228 344A3304P3922 39.2k OhmsR229 344A3304P4752 47.5k OhmsR230 344A3304P1002 10k OhmsR231 344A3304P4751 4.75k OhmsR232 344A3304P10R0 10 OhmsR233thruR235344A3304P4752 47.5k OhmsR236 344A3304P4751 4.75k OhmsR237thruR239344A3304P1001 1k OhmsR240 Not UsedR241thruR244344A3304P1001 1k OhmsR245 344A3304P47R5 47.5 OhmsR246 344A3304P1001 1k OhmsR247 344A3304P47R5 47.5 OhmsR248 344A3304P1001 1k Ohms
PARTS LIST22 MM101886V1 R1ASymbol Part Number DescriptionR249 Not UsedR250 344A3304P1001 1k OhmsR251 Not UsedR252andR253344A3304P1001 1k OhmsR254 344A3304P1003 100k Ohms- - - - TEST POINTS - - - -TP1 A trace on the printed wire boardTP2 344A3367P1 TEST POINTTP3andTP4Traces on the printed wire boardTP5 344A3367P1 TEST POINT- - - - TRANSFORMERS - - - -TX1,TX2 REGUA10003/1 B5F- - - - INTEGRATED CIRCUITS - - - -U1 GNLM239D Quad Operational Amplifier LM239A/SO: ON SEMIU100 VEUPC3206GR-E1 Automatic Gain Control Amplifier UPC3206GR: NECU101 19A705535P3 FM Receiver Module SA605: PHILIPS SEMIU102andU103RYT 101 6239/C Dual Analog Switch (SPDT) MAX4544: MAXIMU104 GNLM239D Quad Operational Amplifier LM239A/SO: ON SEMIU105 VELM6172IM Dual High Speed, Low Power, Low Distortion VoltageFeedback Amplifier LM6172IM: NATIONAL SEMIU106 GNLM239D Quad Operational Amplifier LM239A/SO: ON SEMIU200 RYT 101 6140/2 Rail-To-Rail Operational Amplifier TLC2274/SO: TIU201 19A704971P10 +8 Volt Regulator MC78M08C/TOU202 10A704971P9 +5 Volt Regulator LM78L05AC/SO: FAIRCHILD SEMIU203 RYT 101 6002/2C Low Power Quad Operation Amplifier LM2902/SO: ONSEMIU204 344A3064P201 3-To-8 Line Decoder/Demultiplexer 74HCT138/SO: ONSEMIU205 19A703483P311 CMOS Quad-Input OR Gate 74HC32/SO: ON SEMIU206 19A703987P324 8-Bit Shift Register 74HC595/SO: ON SEMIU207 RYT 101 6239/C Dual Analog Switch (SPST) MAX4544: MAXIMMAX4544: MAXIMU208 19A704971P10 +8 Volter Regulator MC78M08C/TO: ON SEMI- - - - CRYSTALS - - - -Y100 CY101062V1 20.945 MHz: TEN, NDK, ToyocomY101 19A149976P1 Discriminator: 455 kHz MURATA105 PB101127V1 Receiver IF Printed Wiring Board
IC DATAMM101886V1 R1A 237.0 IC DATAU1, U104, U106Quad Operational AmplifierGNLM239/C (LM239A/SO)U100Automatic Gain Control (AGC) AmplifierVEUPC3206GR-E1 (UPC3206GR)Continued
IC DATA24 MM101886V1 R1AContinued
IC DATAMM101886V1 R1A 25U101FM Receiver Module19A705535P3U102, U103, U207Dual Analog Switch (Single-Pole/Double-Throw)RYT 101 6239/C (MAX4544)U105Dual High Speed, Low Power, Low Distortion Voltage Feedback AmplifierVELM6172IM (LM6172IM)
IC DATA26 MM101886V1 R1AU200Rail–to-Rail Operational AmplifierRYT 101 6140/2 (TLC2274/SO)
IC DATAMM101886V1 R1A 27U201, U208+8 Volt Regulator19A704971P10 (MC78M08C/TO)U202+5 Volt Regulator19A704971P9 (LM78L05AC/SO)Pinout:1 - Vout2 - Ground3 - Ground4 - N.C.5 - N.C.6 - Ground7 - Ground8 - Vin
IC DATA28 MM101886V1 R1AU203Low Power Quad Operation AmplifierRYT 101 6002/2C (LM2902/SO)U2043-8 Inverting Line Decoder/Demultiplexer344A3064P201 (74HCT138/SO)m
IC DATAMM101886V1 R1A 29U205Quad 2-Input OR Gate19A703483P311 (74HC32/SO)U2068-Bit Shift Register19A703987P324 (74HC595/SO)
OUTLINE DIAGRAM30 MM101886V1 R1A8.0 OUTLINE DIAGRAMRECEIVER IF MODULECB101128V1(AD-CB101128V1, Sh.3, Rev. B)
SCHEMATIC DIAGRAMMM101886V1 R1A 319.0 SCHEMATIC DIAGRAMRECEIVER IF MODULECB101128V1(WD-CB101128V1, Sh. 1, Rev. A)
SCHEMATIC DIAGRAM32 MM101886V1 R1ARECEIVER IF MODULECB101128V1(CB101128V1, Sh. 2, Rev. A)
SCHEMATIC DIAGRAMMM101886V1 R1A 33RECEIVER IF MODULECB101128V1(CB101128V1, Sh. 3, Rev. A)
M/A-COM Wireless Systems3315 Old Forest RoadLynchburg, Virginia 24501(Outside USA, 434-385-2400) Toll Free 800-528-7711www.macom-wireless.com Printed in U.S.A.

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