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

Download:
Mirror Download [FCC.gov]
Document ID	311103
Application ID	075vpy9BfOZpg8rQ7aTVIQ==
Document Description	RX IF
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	102.61kB (1282606 bits)
Date Submitted	2003-03-18 00:00:00
Date Available	2003-03-07 00:00:00
Creation Date	2002-10-28 16:11:25
Producing Software	Acrobat Distiller 5.0.5 (Windows)
Document Lastmod	2002-10-29 08:09:11
Document Title	MM101886V1 R1A, 21.4 MHz Receiver IF Module, 12.5/25 kHz Channel Spacing, CB101128V1
Document Creator	Acrobat PDFMaker 5.0 for Word
Document Author:	M/A-COM Private Radio Systems, Inc.

Maintenance Manual
MM101886V1 R1A
21.4 MHz RECEIVER IF MODULE
12.5/25 kHz CHANNEL SPACING
CB101128V1
TABLE OF CONTENTS
Page
1.0
SPECIFICATIONS................................................................................................................................................. 3
2.0
DESCRIPTION ...................................................................................................................................................... 4
3.0
CIRCUIT ANALYSIS............................................................................................................................................ 5
3.1
INPUT AMPLIFIER NETWORK...................................................................................................................... 5
3.2
CRYSTAL FILTERS, IF AMPLIFIER .............................................................................................................. 5
3.3
INTEGRATED CIRCUIT AGC AMPLIFIER................................................................................................... 5
3.4
OSCILLATOR/MIXER/DETECTOR................................................................................................................ 6
3.5
AUDIO AMPLIFIER ......................................................................................................................................... 6
3.6
SQUELCH.......................................................................................................................................................... 7
3.6.1 Buffer Amplifier ............................................................................................................................................. 7
3.6.2 Bandpass Filter ............................................................................................................................................... 8
3.6.3 Noise Detector ................................................................................................................................................ 8
3.6.4 DC Amplifier .................................................................................................................................................. 8
3.6.5 Schmitt Trigger ............................................................................................................................................... 8
3.7
FAULT DETECTORS ....................................................................................................................................... 8
3.8
VOLTAGE REGULATORS .............................................................................................................................. 9
3.9
ADDRESS DECODER ...................................................................................................................................... 9
4.0
MAINTENANCE ................................................................................................................................................. 10
4.1
RECOMMENDED TEST EQUIPMENT......................................................................................................... 10
4.2
ALIGNMENT PROCEDURE .......................................................................................................................... 10
4.3
CRYSTAL FILTER TUNING ......................................................................................................................... 11
4.3.1 Tuning FL1 and FL2..................................................................................................................................... 11
4.3.2 Tuning FL3 and FL4..................................................................................................................................... 11
4.4
AUDIO AND DATA OUTPUT ADJUSTMENTS.......................................................................................... 11
4.5
TROUBLESHOOTING.................................................................................................................................... 11
5.0
ASSEMBLY DIAGRAM ..................................................................................................................................... 13
6.0
PARTS LIST ........................................................................................................................................................ 14
7.0
IC DATA .............................................................................................................................................................. 23
8.0
OUTLINE DIAGRAM ......................................................................................................................................... 30
9.0
SCHEMATIC DIAGRAM ................................................................................................................................... 31
NOTE
This 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.
NOTE
The 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 from
attempting to decompile, reverse engineer, or disassemble the Object Code, or in any other way convert the Object Code into
human-readable form.
This manual is published by M/A-COM Private Radio Systems, Inc., without any warranty. Improvements and changes to this manual
necessitated by typographical errors, inaccuracies of current information, or improvements to programs and/or equipment, may be made by
M/A-COM Private Radio Systems, 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 means, electronic or mechanical, including
photocopying 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.
MM101886V1 R1A
SPECIFICATIONS
1.0 SPECIFICATIONS1
Item
I.F. (Intermediate Frequency)
Input Impedance
l2 dB SINAD
Adj. CH Rejection
Image Rejection
Intermodulation Rejection
Signal Displacement Bandwidth
2nd I.F. (Intermediate Frequency)
455 kHz Balanced Output Level
2nd L.O. Frequency
AF Output (J2, Pin 31C)
AF Output Impedance
AF Distortion
AF Response
10 Hz
300 Hz
1000 Hz
3 kHz (25 kHz Channel)
3 kHz (12.5 kHz Channel)
Hum & Noise Rejection
RSSI Output (J2, Pin 20C)
RSSI Time Constant
SQ Threshold Sensitivity
SQ Maximum Sensitivity
SQ Clipping
SQ Attack
SQ Close
SQ Output (J2, Pin 26C)
Fault Output (J2, Pin 11C)
AGC Range
DC Supply
Specification
21.4 MHz
50 ohm
≤-120 dBm (25 kHz); ≤-119 dBm (12.5 kHz)
≥85 dB (25 kHz); ≥80 dB (12.5 kHz)
≥100 dB
≥83 dB (25 kHz); ≥78 dB (12.5 kHz)
≥2 kHz (25 kHz); ≥1 kHz (12.5 kHz)
455 kHz
2.2 V PP per line, adjustable
20.945 MHz
1 Vrms adjustable (with standard input signal)
1k ohm
≤3% (25 kHz); ≤5% (12.5 kHz)
≥-3 dB ref.
±1 dB ref.
0 dB reference
±1.6 dB ref.
± 2.5 dB ref.
≥55 dB (25 kHz); ≥50 dB (12.5 kHz)
0.7 to 2.7 VDC
5 ms
≤-123 dBm (25 kHz); ≤-122 dBm (12.5 kHz)
≤-110 dBm (25 kHz); ≤-109 dBm (12.5 kHz)
3 kHz
150 ms
250 ms
5V logic (low = squelched)
5V logic (low = fault)
50 dB
13.8V, 80 mA max.; 12.0V, 65 mA max.
These specifications are intended to be used by the service technician during servicing. Refer to the appropriate
Specification Sheet for the complete Specification.
MM101886V1 R1A
DESCRIPTION
2.0 DESCRIPTION
The MASTR III Receiver IF Module 19D902783G7/G11 provides amplification and
demodulation of the 21.4 MHz Intermediate Frequency (IF) signal as well as Automatic
Gain Controlled (AGC) 455 kHz outputs to the DSP Modem module(Figure 1 - 21.4
MHz 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 quadrature
detector
•
A variable gain AF amplifier
•
A squelch circuit
•
A fault detector circuit
•
An integrated circuit voltage regulator
•
An address decoder
Figure 1 - 21.4 MHz Receiver IF Module
MM101886V1 R1A
CIRCUIT ANALYSIS
3.0 CIRCUIT ANALYSIS
3.1
INPUT AMPLIFIER NETWORK
The input amplifier consisting of transistor Q1 and transformer TX1, provides a 50 ohm
load for the receiver IF module.
Capacitor C1 provides AC coupling and a DC block on the input line (J1). This DC block
protects 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 lowimpedance path from J1 to amplifier transistor Q1. Capacitor C2 and inductor L2 are
parallel-resonant at 21.4 MHz and provide a path to the 50-ohm load, resistor R1, for
mixer products other than 21.4 MHz.
3.2
CRYSTAL FILTERS, IF AMPLIFIER
Crystal Filters FL1, FL2, FL3 and FL4, transistor Q2 circuit, and associated circuitry
provide IF filtering and amplification at 21.4 MHz. Filters FL1 and FL2 are two pole
crystal 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. When
combined, the filter set has associated matching networks to match the combination to a
50-ohm input and output impedance. FL3 and FL4 are matched to a 50-ohm input
impedance and a 470 ohm output impedance. The FL1 and FL2 pair is specified to have
especially good intermodulation performance to meet the overall requirements for the
module.
3.3
INTEGRATED CIRCUIT AGC AMPLIFIER
The first two stages of AGC Amplifier U100 consist of two IF amplifiers whose gain can
be controlled with an AGC voltage. These two amplifiers are connected in cascade to
combine their gains. The combined voltage gain varies from about 35 dB at an AGC
voltage of 3.5 VDC down to about –25 dB at an AGC voltage of <1.5 VDC. The AGC
voltage is supplied by the DSP Modem module. In the two level FM mode, when no DSP
modem is present, the AGC voltage is set to a fixed voltage of 3.5 volts by voltage
divider 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 input
of 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 U100
to resistor R103.
The video amplifier has a single ended voltage gain (from the input to one output) of
from 25 to 43 dB. The gain is set in this range by adjusting resistor R100. The differential
gain is 6 dB higher than the single ended gain. The input of this stage comes from the IC
mixer U101 output by way of 455 kHz filter FL100. Filter FL100 has a 6 dB bandwidth
of ±7.5 kHz to reduce the level of adjacent channel signals passing into the DSP Modem
module. The differential output of the video amplifier is routed to U105, and then to the
DSP Modem module via the Backplane board.
MM101886V1 R1A
CIRCUIT ANALYSIS
3.4
OSCILLATOR/MIXER/DETECTOR
Integrated circuit U101 performs several functions. The 20.945 MHz crystal oscillator
provides local oscillator injection to the mixer in U101. This mixer converts the 21.4
MHz IF signal to 455 kHz. Capacitors C119 and C120 are oscillator feedback capacitors
and have been chosen to provide the proper capacitance for crystal Y100. The frequency
can be adjusted by means of L102. The proper oscillator output level is difficult to
measure directly without affecting the circuit operation. The level at TP3 should be
approximately 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 the
mixer input and output respectively. Typical mixer conversion voltage gain is
approximately 12 dB. The mixer output feeds the transistor Q100 IF amplifier circuit and
each analog switch, U102 and U103. The output from Q100 is routed to ceramic filter
FL100. In the 12.5 kHz bandwidth mode, analog switches U102 and U103 route the 455
kHz IF through FL101 to the U101 IF amplifier input. In the 25 kHz mode, the mixer
output is switched around FL101 by U102 and U103 and is then routed to the IF
amplifier input. In the four level FM mode, FL101 is bypassed as in the 25 kHz two level
mode. 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 an
attenuator consisting of resistors R143, R144, and R145 to ceramic bandpass filter
FL102, then to the limiter input at U101, Pin 14. The limiter output drives one input of
the quadrature detector via capacitor C129.
A Received Signal Strength Indicator (RSSI) is provided at U101, Pin 7. This indicator
signal is generated within the limiter circuitry and provides an output current proportional
to the logarithm of the input signal strength. This current develops a voltage across
resistor R141. The voltage varies from about 1.6 VDC for noise input, to about 2.4 VDC
for a 12 dB SINAD signal, to a maximum of about 4.7 VDC for a –75 dBm IF input
signal at J1. RSSI Buffer U200A provides buffering to eliminate loading effects on the
RSSI line. The RSSI line will provide a constant output level above a –75 dBm IF input
level, 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 the
detector is internally connected to the limiter and is not externally available. The output
of the detector is at U101, Pin 9. Capacitor C145 provides lowpass filtering to remove
455 kHz feed-through. Ceramic resonator Y101 provides the frequency-selective
component needed for FM demodulation. Y101 replaces the typical LC resonant circuit
found in most quadrature detectors. In contrast to the typical LC network, Y101 requires
no adjustment. In the four level FM mode, the detector output of U101 is not used. The
detected audio output is derived by other circuitry in the base station.
Integrated circuit U101 general: The DC supply to U101 is provided through voltage
dropping resistor Rl04 to U101, Pin 6. The voltage drop across resistor R104 is used to
monitor the dc voltage on U101 for fault detection.
3.5
AUDIO AMPLIFIER
Operational amplifier U200C provides audio frequency amplification. The gain of
U200C is set by associated resistors, including variable resistor R203. Resistor R203
allows adjustment of the AF output level to 1 Vrms with a standard input signal to the
MM101886V1 R1A
CIRCUIT ANALYSIS
module (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 standard
deviation is 1.5 kHz. To provide the same 1 Vrms output, the gain is increased by
shunting 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 biasing
U200C.
DIPLEXER
21.4 MHz
XTAL FILTER
IF AMP
IF AMP
AGC AMP
UPC3206
21.4 MHz
XTAL FILTER
21.4 MHz
IF IN
TO FM
IF IC
Q1
FL1,FL2
Q2
455 kHz
CER FILT
IF BUFFER AMP
U100A,B
FL3,FL4
AGC IN FROM
DSP MODEM
BUFER AMP
LM6172
BUFFER AMP
UPC3206C
455 kHz
CER FILT
FL101
Q100
U102
U105A
U100C
FL100
455 kHz
CER FILT
FL102
U103
455 kHz TO
DSP MODEM
U105B
WB/NB
IF AMP
MIXER
455
kHz
21.4 MHz
FM IF
IC IN
AUDIO
AMP
LIMITER
IF AMP
DATA
OUT
DETECTOR
U200C
SA605 FM IF IC
U101
U200A
RSSI
455 kHz
DISCRIMINATOR
20.945
MHz
RSSI
OUT
RSSI
BUFFER
Figure 2 – 21.4 MHz IF Module Block Diagram
3.6
SQUELCH
3.6.1
Buffer Amplifier
Buffer amplifier U200D (Refer to Schematic Diagram WD-CB101128V1, Sh. 3) is
configured as a unity gain buffer amplifier. Its purpose is to provide a high input
impedance in order to minimize loading of preceding circuitry.
MM101886V1 R1A
CIRCUIT ANALYSIS
3.6.2
Bandpass Filter
Bandpass filter U203A, together with its associated circuitry, performs the function of an
audio frequency bandpass filter, centered at 6 kHz with a gain of 2. 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 presence 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.
3.6.3
Noise Detector
Noise 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 a
rectifier with gain. The rectified output of U203B charges capacitors C213 and C214 to a
nearly constant dc voltage. (Actually the R216-C213,C214 time constant will allow a 5
Hz variation.)
3.6.4
DC Amplifier
DC amplifier U203C is configured as a basic amplifier with a gain of 5.0 in the 25 kHz
mode. In the 12.5 kHz mode, the gain is increased by about 6 dB by shunting resistor
R218 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. This
arrangement provides hysteresis in the output versus input characteristic. This eliminates
the possibility of the squelch circuit repeatedly cutting in and out when the input signal is
near a threshold. Resistors R223 and R224 act as a voltage divider to provide a 5 volt
logic level output.
3.7
FAULT DETECTORS
Voltage comparators U1, U104, and U106 are configured as "window detectors," which
pull the FAULT DETECT line low (approximately 0 volts) if the voltage applied falls
outside the specified range (window). For example: U106C senses whether the input
voltage is greater than the upper limit of the window. This limit is set by the voltage
divider R128, R129, and R130 (6.75 VDC). Comparator U106D senses whether the input
is less than the lower limit of the window (4.88 VDC, again set by R128, R129, and
R130). Therefore, in this example the window is 4.88 VDC to 6.75 VDC. The
U106C/U106D window detector circuit is used to determine whether the U200D voltage
regulator output (+6 VDC) is within this range. The other window detector circuits
monitor dc operating voltages on transistors Ql and Q2 and integrated circuits U100 and
U101 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 is
indicated when the output drops to zero.
Diode Dl00 and transistor Q101 monitor the output of the 8 V regulator. Dl is a 8.2 Volt
Zener diode. If the regulator output voltage should rise above 8.9 V (8.2 + 0.7 base-
MM101886V1 R1A
CIRCUIT ANALYSIS
emitter drop) Q101 will turn on and a fault will be indicated. Transistors Q3 and Q4 are
drivers 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 and
Q100. 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 provides
5VDC to U100, U204, U205, and U206. This regulator operates from the 8 VDC
provided by U201.
3.9
ADDRESS DECODER
The address decoder circuit consists of binary-to-octal converter U204, quad or-gate
U205, 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 an
enable 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, it
detects the data on the DATA input at Pin 14. Internal flip-flops latch the data to hold the
output state on Pin 15. Depending on the data, U206, Pin 15 is either high for the
narrowband (12.5 kHz) mode or low for the wideband (25 kHz) mode. A “high” is a
voltage greater than 3.5 VDC, and a “low” is a voltage less than 1.0 VDC.
3.10 BUFFER AMPLIFIER U105
Operational amplifier U105 amplifies the 455kHz output from the video amplifier in
U100 to a maximum level of 2.2 V peak-to-peak. The differential output of U105 is
routed to J2, Pins A31 and A32. The differential signal passes through the backplane
board to the DSP Modem module. Buffer amplifier U105 has a voltage gain of
approximately 2.
MM101886V1 R1A
MAINTENANCE
4.0 MAINTENANCE
4.1
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 @ 180 mA
8. Power Supply; 12 VDC @40 mA
9. M/A-COM Test Box TS101285V11
4.2
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 VDC
current is between 45 and 65 mA.
NOTE
The currents cannot be measured directly when the TS11285V11 test box is used. The
currents can be determined by measuring the voltage drop across L201 and L202 on
the Receiver IF printed wire board and the resistance of each coil. The current can be
calculated with the following formula:
I = Vdrop/Rcoil
3. 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 signal
modulated 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 pin
connector J2).
10
MM101886V1 R1A
MAINTENANCE
4.3
CRYSTAL FILTER TUNING
4.3.1
Tuning FL1 and FL2
1. 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 21.4
MHz.
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 FL4
1. 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 +/- 6.1
and 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 as
needed until the requirements are met.
The bandwidth is controlled primarily by C12 and C29.
NOTE
4. Set the squelch pot on the test fixture to maximum (maximum means to set the wiper
for maximum signal at the Sq-Arm terminal)
4.4
AUDIO AND DATA OUTPUT ADJUSTMENTS
1. In the 25 kHz mode, apply a standard input signal (-75 dBm, 21.4000 MHz signal
modulated with a 1kHz Audio Frequency (AF), 3kHz peak deviation) to the module
IF input. Turn the FM modulation off. Monitor TP5 with a high impedance probe
connected 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 at
module output (Pin 31C on 96 pin connector, Pin 52).
3. Remove the FM modulation from the test signal. Monitor the 455kHz+ jack on the
test box with an oscilloscope using a high-impedance probe. Adjust R100 for a
2.2±0.1 volts peak-to-peak level. The 455 kHz-jack shall have a level of 2.2 ± 0.2 V
peak-to-peak.
4.5
TROUBLESHOOTING
When troubleshooting the module, it is most convenient if the standard test fixture is
used. The following conditions are with the module in the 25 kHz mode. This can be set
up using a PC with the necessary software connected to the test box. Alternatively, a wire
link can be soldered between pads H1 and H2 on the PC board.
MM101886V1 R1A
11
MAINTENANCE
IF amplifier transistor Q2 has a nominal 8 dB gain. Transistor Q2 has a nominal gain of
8.5 dB. The mixer has about 14 dB voltage gain with proper LO injection. The proper
crystal 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 signal
All RF voltages measured with 10 Megohm, 11 pF probe.
Table 1 - Troubleshooting Guide
SYMPTOM
CHECK
(CORRECT READING SHOWN)
INCORRECT READING
INDICATES DEFECTIVE
COMPONENT
Fault indicator
on
Check DC voltages:
+8V @ U201, Pin 3
+6V @ U200, Pin 7
1.5V @ Q1 and Q2 (emitters)
6V @ U101, Pin 5
If DC voltages not correct
U201 or associated components
U200 or associated components
Q1 and Q2 or associated components
U101 or associated components
No audio - no
noise
With no signal applied to module IF input:
Check for AF noise @ C146; 200mV
Check for AF noise @ U200, Pin 8; 1 V
U101 or associated components
U200 or associated components
Noise only no
demodulated
audio
Check crystal oscillator:
TP3, 10 mVpk, 20.945 MHz
Apply -30 dBm, 21.4 MHz input, check TPl 60 mVpk
Apply -60 dBm, 21.4 MHz input, check TP4 20 mVpk
Poor 12 dB
SINAD
Check crystal oscillator:
TP3, 10 mVpk, 20.945 MHz
Apply -30 dBm, 21.4 MHz input, check TP1, 60 mVpk
Apply -60 dBm 21.4 MHz input, check TP4, 20 mVpk
No squelch
function
With squelch pot maximum, or with module AUDIO/
SQUELCH/HI connected to SQUELCH/ARM input and
with no signal to module IF input:
12
U101, Y100 or associated components
Q1, FL1, FL2 or associated components
Q2, FL3, FL4, Y101, U100 or associated
components
U101, Y100 or associated components
Q1, FL1, FL2, Y100, or associated components
Q2, FL3, FL4, U100, U101 FL102 or associated
components
Check Presence of 1 Vpk noise @ U200, Pin 14
Check presence of 1 Vpk noise U7 @t Pin 12
U200 or associated components
Check DC voltage U203 @t Pin 8: 7V
Check DC voltage U203 @ Pin 14: 0.5V
U203 or associated components
MM101886V1 R1A
ASSEMBLY DIAGRAM
5.0 ASSEMBLY DIAGRAM
Item
Part Number
Description
21.4 MHz Receiver IF
Module EA101401V1
19D902508P1
Chassis
19D902509P1
Cover
19D902555P1
Handle
19A702381P506 Screw, torq
19A702381P513 Screw, torq
19B235310P1
NP, Blank
19B802690P1
Grommet
19A702381P508 Screw, torq
CB101128V1
Board, Component
Qty
RECEIVER IF MODULE
EA101401V1
(AD-EA101401, Rev. A)
MM101886V1 R1A
13
PARTS LIST
6.0 PARTS LIST
MASTR III RECEIVER IF CIRCUIT BOARD ASSEMBLY
PL-CB101128V1 Revision: A
Symbol
Part Number
Description
- - - - CAPACITORS - - -
C1
and
C2
C3
C4
C5
C6
C7
and
C8
C9
C10
C11
C12
C13
C14
and
C15
C16
C17
C18
and
C19
C20
C21
C22
C23
C24
C25
C26
C27
and
C28
C29
C30
C31
C32
C33
C34
RJC 463 4043/12
120pF
RJC 464 2045/47
RJC 464 2045/1
RJC 464 3044/47
RJC 464 2045/1
RJC 463 6042/15
47nF
10nF
4.7nF
10nF
15pF
19A704350P102
RJC 463 4042/33
RJC 463 9041/27
19A704350P102
RJC 463 9041/27
RJC 463 9041/56
3-10pF: MURATA
33pF
2.7pF
3-10Pf: MURATA
2.7pF
5.6pF
RJC 463 9041/27
19A704350P102
RJC 463 6042/15
2.7pF
3-10pF: MURATA
15pF
RJC 464 2045/1
RJC 464 3044/47
RJC 464 2045/47
RJC 464 2045/1
19A704350P102
RJC 463 4042/33
RJC 463 9041/27
RJC 463 6042/15
10nF
4.7nF
47nF
10nF
3-10pF: MURATA
33pF
2.7pF
15pF
19A704350P102
RJC 463 9041/27
RJC 464 3044/47
RJC 463 9041/27
RJC 464 3044/47
RJC 463 6042/15
3-10pF: MURATA
2.7pF
4.7nF
2.7pF
4.7nF
15pF
COMPONENTS ADDED, DELETED OR CHANGED BY PRODUCTION CHANGES.
14
MM101886V1 R1A
PARTS LIST
Symbol
C35
C36
C37
C38
C39
C40
thru
C99
C100
and
C101
C102
C103
C104
C105,
C106
C107
C108
C109,
C110,
C111
C112
C113
C114
C115
and
C116
C117
C118
C119
C120
C121
C122
C123
and
C124
C125
and
C126
C127
C128
C129
C130
thru
C135
C136
MM101886V1 R1A
Part Number
Description
19A704350P102
RJC 464 3046/1
RJC 463 4042/1
RJC 463 0041/1
Not Used
3-10pF
100nF
10pF
1pF
Not Used
RJC 464 3045/22
22nF
RJC 464 3067/1
RJC 464 3045/22
RJC 464 3046/1
RJC 464 3045/22
RJC 464 3046/1
RJC 464 3045/22
RJC 464 3044/47
RJC 464 3046/1
RJC 464 3067/1
RJC 463 4043/33
RJC 464 3046/1
RJC 463 4044/1
RJC 464 3045/22
RJC 464 3046/1
1µF.
22nF
100nF
22nF
100nF
22nF
4.7nF
100nF
1µF
330pF
100nF
1nF
22nF
100nF
RJC 463 4044/1
RJC 463 4043/15
RJC 463 4042/56
RJC 463 0041/1
RJC 464 3046/1
RJC 464 2045/1
1nF
Not Used
150pF
56pF
1pF
100nF
10nF
RJC 464 3046/1
100nF
19A705205P15
RJC 464 2045/1
RJC 463 4042/27
RJC 464 3046/1
33 µF
10nF
27pF
100nF
RJC 463 4044/1
1nF
15
PARTS LIST
Symbol
16
Part Number
Description
C137
and
C138
C139
C140
thru
C144
C145
C146
C147
C148
C149
and
C150
C151
and
C152
RJC 464 3046/1
100nF
RJC 463 4042/22
RJC 464 3046/1
22pF
100nF
RJC 463 4043/1
19A705205P5
RJC 464 3046/1
RJC 463 4043/12
RJC 464 3046/1
100pF
6.8µF
100nF
120pF
100nF
RJC 463 6042/15
15pF
C153,
C154
and
C155
C156
C157
C158
C159
thru
C199
C200
C201,
C202
C203
C204
C205
C206
C207
C208,
C209
C210
and
C211
C212
C213
and
C214
C215
C216
C217
and
RJC 463 4042/22
RJC 464 3046/1
22pF
100nF
RJC 463 4042/22
RJC 464 3046/1
RJC 463 4042/22
22pF
100nF
22pF
Not Used
19A705205P111
RJC 464 3067/1
19A705205P2
RJC 464 3046/1
19A705205P2
RJC 464 3046/1
RJC 464 3067/1
RJC 464 2045/1
RJC 463 4043/1
RJC 464 3044/47
RJC 464 2045/47
47µF
1µF
1µF POL
100nF
1µF POL
100nF
1µF
10nF
100pF
4.7nF
47nF
RJC 463 4043/47
RJC 464 3046/1
470pF
100nF
RJC 463 4043/47
RJC 464 3067/1
RJC 463 4043/1
470pF
1µF
100pF
MM101886V1 R1A
PARTS LIST
Symbol
C218
C219
C220
and
C221
C222
C223
C224
thru
C226
C227
C228
thru
C232
C233
and
C234
C235
and
C236
C237
thru
C242
C243
and
C244
C245
and
C246
C247
C248
C249
C250
C251
C252
Part Number
Description
RJC 464 3067/1
RJC 463 4043/1
1µF
100pF
19A705205P2
RJC 464 3046/1
RJC 463 4043/1
1µF POL
100nF
100pF
RJC 463 4043/1
Not Used
100pF
RJC 464 2045/1
10nF
RJC 464 3046/33
0.33µF
RJC 464 2045/1
10nF
RJC 463 4044/1
1nF
RJC 464 2045/1
10nF
RJC 463 4042/33
Not Used
33pF
10nF
1nF
Not Used
33pF
D1
D2
D100
D200
RKZ 323 661/5
19A703595P10
19A700083P105
19A700155P2
- - - - DIODES - - - SMS7630-005: ALPHA IND
LED: AGILENT TECH
BZX84C8V2/SOT: ON SEMI
BAT18: PHILIPS SEMI
FL1
and
FL2
FL100
FL101
and
FL102
Fl101061V1
- - - - FILTERS - - - 21.4 MHz (High IP3 filter set consists of a matched
pair): TEW
VECFUM455E
VECFUM455F
455 kHz Ceramic Filter: MURATA
455 kHz Ceramic Filter: MURATA
MM101886V1 R1A
RJC 463 4042/33
RJC 464 2045/1
RJC 463 4044/1
17
PARTS LIST
Symbol
Part Number
Description
- - - - CONNECTORS - - - -
J1
J2
19A115938P24
19B801587P7
BNC
96 PIN
L1
and
L2
L3
and
L4
L5
and
L6
L7
and
L8
L9
L10
REG704593/47
0.47µH: TDK
REG704594/68
6.8µH: TDK
L100
L101
L102
L103
REG 704 14/37
REG 704 593/27
19A703311P1
REG 704 14/37
10µH.
0.27µH: TDK
0.75µH: Toko
10µH
L201
and
L202
REG 704 14/37
10µH
Q1,Q2
Q3
and
Q4
19A704708P2
19A700076P2
- - - - TRANSISTORS - - - NE85633: CEL (NEC)
MMBT3904/SOT: ON SEMI
Q100
and
Q101
19A700076P2
MMBT3904/SOT: ON SEMI
Q201
thru
Q203
19A700076P2
MMBT3904/SOT: ON SEMI
R1
R2
R3
R4
R5
R6
R7
344A3304P51R1
344A3304P1000
344A3304P1002
344A3304P3321
344A3304P8250
344A3304P9090
19B801251P5R6
51.1 Ohms
100 Ohms
10k Ohms
3.32k Ohms
825 Ohms
909 Ohms
5.62 Ohms
- - - - INDUCTORS - - - -
VELQS33N1R5G04 1.5µH: MURATA
REG704594/68
6.8µH
VELQS33N1R5G04 1.5µH: MURATA
REG 704 14/31
3.3µF
- - - - RESISTORS - - - -
18
MM101886V1 R1A
PARTS LIST
Symbol
R8
R9
R10
R11
R12
R13
R14
R15
R16
and
R17
R18
R19
R20
R21
R22
R23
R24
and
R25
R26
and
R27
R28
thru
R34
R35
R36
thru
R99
R100
R101
R102
R103
R104
R105
R106
R107
R108
R109
R110
R111
R112
R113
R114
R115
R117
MM101886V1 R1A
Part Number
Description
344A3304P9090
344A3304P1000
344A3304P1002
344A3304P3321
344A3304P8250
344A3304P9090
19B801251P5R6
344A3304P9090
344A3304P3321
909 Ohms
100 Ohms
10k Ohms
3.32k Ohms
825 Ohms
909 Ohms
5.62 Ohms
909 Ohms
3.2k Ohms
344A3304P6811
344A3304P1003
344A3304P1502
344A3304P2211
344A3304P2741
344A3304P4750
344A3304P1000
6.81k Ohms
100k Ohms
15k Ohms
2.21k Ohms
2.74k Ohms
475 Ohms
100 Ohms
344A3304P6811
6.81k Ohms
Not Used
Not Used
Not Used
REL 316 1114/1
344A3304P2000
344A3304P1001
344A3304P51R1
344A3304P3320
344A3304P2212
19B801251P1
344A3304P2210
344A3304P1503
344A3304P1501
344A3304P8250
344A3304P1003
344A3304P1002
344A3304P4321
344A3304P3321
344A3304P6811
344A3304P3321
1K VAR
200 Ohms
1k Ohms
51.1 Ohms
332 Ohms
22.1k Ohms
0 Ohms
221 Ohms
150k Ohms
1.5k Ohms
825 Ohms
100k Ohms
10k Ohms
4.32k Ohms
3.32k Ohms
6.81k Ohms
3.32k Ohms
19
PARTS LIST
Symbol
R118
R119
R120
R121
R122
R123
R124
R125
R126
R127
R128
R129
R130
R131
R132
R133
R134
R135
R136
R137
R138
R139
R140
R141
R142
R143
R144
R145
R146
R147
R148
and
R149
R150
and
R151
R152
and
R153
R154
R155
R156
thru
R200
R201
R202
R203
20
Part Number
344A3304P6811
344A3304P1212
344A3304P4750
344A3304P2211
344A3304P4750
344A3304P8250
344A3304P1002
344A3304P1211
344A3304P3921
344A3304P1211
344A3304P1821
344A3304P4751
344A3304P8251
344A3304P1002
344A3304P1502
344A3304P1003
344A3304P1002
344A3304P6812
344A3304P1213
344A3304P1003
344A3304P3322
344A3304P1003
344A3304P1211
344A3304P3321
344A3304P2211
344A3304P4751
344A3304P2670
344A3304P2211
344A3304P4750
Description
6.81k Ohms
Not Used
12.1k Ohms
475 Ohms
2.21k Ohms
475 Ohms
825 Ohms
10k Ohms
1.21k Ohms
3.92k Ohms
1.21k Ohms
1.82k Ohms
4.75k Ohms
8.25k Ohms
10k Ohms
15k Ohms
100k Ohms
10k Ohms
68.1k Ohms
121k Ohms
100k Ohms
33.2k Ohms
Not Used
100k Ohms
1.21k Ohms
3.32k Ohms
2.21k Ohms
4.75k Ohms
267 Ohms
2.21k Ohms
475 Ohms
Not Used
19B801251P1
0 ohm.
344A3304P47R5
344A3304P4750
47.5 Ohms
475 Ohms
Not Used
344A3304P2741
344A3304P3321
REL 316 1115/2
2.74k Ohms
3.32k Ohms
20K VAR.
MM101886V1 R1A
PARTS LIST
Symbol
R204
R205
thru
R207
R208
R209
R210
and
R211
R212
R213
R214
R215
R216
R217
and
R218
R219
R220
and
R221
R222
R223
R224
R225
and
R226
R227
R228
R229
R230
R231
R232
R233
thru
R235
R236
R237
thru
R239
R240
R241
thru
R244
R245
R246
R247
R248
MM101886V1 R1A
Part Number
Description
344A3304P1502
344A3304P1003
15k Ohms
100k Ohms
344A3304P6811
344A3304P1001
344A3304P3322
6.81k Ohms
1k Ohms
33.2k Ohms
344A3304P5622
344A3304P8251
344A3304P1002
344A3304P1003
344A3304P3323
344A3304P1002
56.2k Ohms
8.25k Ohms
10k Ohms
100k Ohms
332k Ohms
10k Ohms
344A3304P3922
344A3304P2212
39.2k Ohms
22.1k Ohms
344A3304P6812
344A3304P7500
344A3304P8250
344A3304P4752
68.1k Ohms
750 Ohms
825 Ohms
47.5k Ohms
344A3304P1002
344A3304P3922
344A3304P4752
344A3304P1002
344A3304P4751
344A3304P10R0
344A3304P4752
10k Ohms
39.2k Ohms
47.5k Ohms
10k Ohms
4.75k Ohms
10 Ohms
47.5k Ohms
344A3304P4751
344A3304P1001
4.75k Ohms
1k Ohms
344A3304P1001
Not Used
1k Ohms
344A3304P47R5
344A3304P1001
344A3304P47R5
344A3304P1001
47.5 Ohms
1k Ohms
47.5 Ohms
1k Ohms
21
PARTS LIST
Symbol
R249
R250
R251
R252
and
R253
R254
TP1
TP2
TP3
and
TP4
TP5
Part Number
Description
344A3304P1001
Not Used
1k Ohms
Not Used
1k Ohms
344A3304P1003
100k Ohms
344A3304P1001
344A3367P1
- - - - TEST POINTS - - - A trace on the printed wire board
TEST POINT
Traces on the printed wire board
344A3367P1
TEST POINT
REGUA10003/1
B5F
- - - - TRANSFORMERS - - - TX1,TX2
U1
U100
U101
U102
and
U103
U104
U105
22
- - - - INTEGRATED CIRCUITS - - - GNLM239D
Quad Operational Amplifier LM239A/SO: ON SEMI
VEUPC3206GR-E1 Automatic Gain Control Amplifier UPC3206GR: NEC
19A705535P3
FM Receiver Module SA605: PHILIPS SEMI
RYT 101 6239/C
Dual Analog Switch (SPDT) MAX4544: MAXIM
GNLM239D
VELM6172IM
U106
U200
U201
U202
U203
GNLM239D
RYT 101 6140/2
19A704971P10
10A704971P9
RYT 101 6002/2C
U204
344A3064P201
U205
U206
U207
19A703483P311
19A703987P324
RYT 101 6239/C
U208
19A704971P10
Quad Operational Amplifier LM239A/SO: ON SEMI
Dual High Speed, Low Power, Low Distortion Voltage
Feedback Amplifier LM6172IM: NATIONAL SEMI
Quad Operational Amplifier LM239A/SO: ON SEMI
Rail-To-Rail Operational Amplifier TLC2274/SO: TI
+8 Volt Regulator MC78M08C/TO
+5 Volt Regulator LM78L05AC/SO: FAIRCHILD SEMI
Low Power Quad Operation Amplifier LM2902/SO: ON
SEMI
3-To-8 Line Decoder/Demultiplexer 74HCT138/SO: ON
SEMI
CMOS Quad-Input OR Gate 74HC32/SO: ON SEMI
8-Bit Shift Register 74HC595/SO: ON SEMI
Dual Analog Switch (SPST) MAX4544: MAXIM
MAX4544: MAXIM
+8 Volter Regulator MC78M08C/TO: ON SEMI
Y100
Y101
105
CY101062V1
19A149976P1
PB101127V1
- - - - CRYSTALS - - - 20.945 MHz: TEN, NDK, Toyocom
Discriminator: 455 kHz MURATA
Receiver IF Printed Wiring Board
MM101886V1 R1A
IC DATA
7.0 IC DATA
U1, U104, U106
Quad Operational Amplifier
GNLM239/C (LM239A/SO)
U100
Automatic Gain Control (AGC) Amplifier
VEUPC3206GR-E1 (UPC3206GR)
Continued
MM101886V1 R1A
23
IC DATA
Continued
24
MM101886V1 R1A
IC DATA
U101
FM Receiver Module
19A705535P3
U102, U103, U207
Dual Analog Switch (Single-Pole/Double-Throw)
RYT 101 6239/C (MAX4544)
U105
Dual High Speed, Low Power, Low Distortion Voltage Feedback Amplifier
VELM6172IM (LM6172IM)
MM101886V1 R1A
25
IC DATA
U200
Rail–to-Rail Operational Amplifier
RYT 101 6140/2 (TLC2274/SO)
26
MM101886V1 R1A
IC DATA
U201, U208
+8 Volt Regulator
19A704971P10 (MC78M08C/TO)
U202
+5 Volt Regulator
19A704971P9 (LM78L05AC/SO)
Pinout:
1 - Vout
2 - Ground
3 - Ground
4 - N.C.
5 - N.C.
6 - Ground
7 - Ground
8 - Vin
MM101886V1 R1A
27
IC DATA
U203
Low Power Quad Operation Amplifier
RYT 101 6002/2C (LM2902/SO)
U204
3-8 Inverting Line Decoder/Demultiplexer
344A3064P201 (74HCT138/SO)m
28
MM101886V1 R1A
IC DATA
U205
Quad 2-Input OR Gate
19A703483P311 (74HC32/SO)
U206
8-Bit Shift Register
19A703987P324 (74HC595/SO)
MM101886V1 R1A
29
OUTLINE DIAGRAM
8.0 OUTLINE DIAGRAM
RECEIVER IF MODULE
CB101128V1
(AD-CB101128V1, Sh.3, Rev. B)
30
MM101886V1 R1A
SCHEMATIC DIAGRAM
9.0 SCHEMATIC DIAGRAM
RECEIVER IF MODULE
CB101128V1
(WD-CB101128V1, Sh. 1, Rev. A)
MM101886V1 R1A
31
SCHEMATIC DIAGRAM
RECEIVER IF MODULE
CB101128V1
(CB101128V1, Sh. 2, Rev. A)
32
MM101886V1 R1A
SCHEMATIC DIAGRAM
RECEIVER IF MODULE
CB101128V1
(CB101128V1, Sh. 3, Rev. A)
MM101886V1 R1A
33
M/A-COM Wireless Systems
3315 Old Forest Road
Lynchburg, Virginia 24501
(Outside USA, 434-385-2400) Toll Free 800-528-7711
www.macom-wireless.com
Printed in U.S.A.

---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.3
Linearized                      : No
Encryption                      : Standard V1.2 (40-bit)
User Access                     : Print, Copy, Fill forms, Extract, Assemble, Print high-res
Modify Date                     : 2002:10:29 08:09:11-05:00
Subject                         : Maintenance Manual
Create Date                     : 2002:10:28 16:11:25-05:00
Page Count                      : 34
Creation Date                   : 2002:10:28 16:11:25-05:00
Mod Date                        : 2002:10:29 08:09:11-05:00
Producer                        : Acrobat Distiller 5.0.5 (Windows)
Author                          : M/A-COM Private Radio Systems, Inc.
Metadata Date                   : 2002:10:29 08:09:11-05:00
Creator                         : M/A-COM Private Radio Systems, Inc.
Description                     : Maintenance Manual
Title                           : MM101886V1 R1A,  21.4 MHz Receiver IF Module, 12.5/25 kHz Channel Spacing, CB101128V1
Page Mode                       : UseOutlines
Page Layout                     : SinglePage

EXIF Metadata provided by EXIF.tools