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Table of Contents
Chapter 1 THEORY OF OPERATION
1.0 Introduction ..........................................................................................................1-1
2.0 Transmitter...........................................................................................................1-1
2.1 General...........................................................................................................1-1
3.0 Receiver...............................................................................................................1-3
3.1 Receiver Front-End ........................................................................................1-3
3.2 Receiver Back-End.........................................................................................1-4
3.3 Automatic Gain Control Circuit .......................................................................1-5
4.0 Reciever (for models with PCB 8415533H02) .....................................................1-6
4.1 Reciever Front-End ........................................................................................1-6
4.2 Receiver Back-End.........................................................................................1-7
4.3 Automatic Gain Control Circuit .......................................................................1-8
5.0 Frequency Generation Circuitry..........................................................................1-9
5.1 Synthesizer.....................................................................................................1-9
5.2 Voltage Controlled Oscillator (VCO).............................................................1-11
Chapter 2 TROUBLESHOOTING CHARTS
1.0 Introduction ..........................................................................................................2-1
Troubleshooting Chart for Receiver (Sheet 1 of 2) ..............................................2-2
Troubleshooting Chart for Receiver (Sheet 2 of 2) ..............................................2-3
Troubleshooting Chart for Reciever (PCB8415533H02) (Sheet 1 of 2)...............2-4
Troubleshooting Chart for Reciever (PCB8415533H02) (Sheet 1 of 3)...............2-5
Troubleshooting Chart for VCO ...........................................................................2-6
Troubleshooting Chart for Synthesizer ...............................................................2-7
Troubleshooting Chart for Transmitter................................................................2-8
Troubleshooting Chart for Controller....................................................................2-9
Chapter 3 VHF PCB/SCHEMATICS AND PARTS LISTS
1.0 Notes For All Schematics and Circuit Boards......................................................3-1
2.0 Allocation of Schematics and Circuit Boards .......................................................3-2
2.1 VHF (136-174MHz) ........................................................................................3-2
3.0 VHF PCB, Schematic Diagrams and Radio Parts List (RF Board)......................3-5
3.1 8404055G05/G06/G07/G09 ...........................................................................3-5
3.2 8415533H02.................................................................................................3-21
3.3 8471021L01..................................................................................................3-37
3.4 8486062B12 .................................................................................................3-53
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