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Table of Contents
Foreword
Product Safety and RF Exposure Compliance.......................................................................... inside cover
Computer Software Copyrights ................................................................................................. inside cover
Document Copyrights................................................................................................................ inside cover
Disclaimer.................................................................................................................................. inside cover
List of Figures........................................................................................................................................... viii
List of Tables ..............................................................................................................................................xi
Related Publications...................................................................................................................................xi
Chapter 1 Test Equipment, Service Aids, and Service Tools.......... 1-1
1.1 Test Equipment.............................................................................................................................. 1-1
1.2 Service Aids................................................................................................................................... 1-2
Chapter 2 DC Power Distribution........................................................ 2-1
2.1 DC Regulation and Distribution ..................................................................................................... 2-1
Chapter 3 Controller Theory of Operation.......................................... 3-1
3.1 Controller ....................................................................................................................................... 3-1
3.1.1 Microprocessor Circuitry ...................................................................................................3-1
3.1.1.1 Memory Usage ........................................................................................................ 3-2
3.1.1.2 Control and Indicator Interface ................................................................................ 3-2
3.1.1.3 Serial Bus Control of Circuit Blocks......................................................................... 3-2
3.1.1.4 Interface to RSS Programming................................................................................ 3-3
3.1.1.5 Storage of Customer-Specific Information............................................................... 3-3
3.1.1.6 Sensing of Externally-Connected Accessories........................................................ 3-3
3.1.1.7 Microprocessor Power-Up, Power-Down and Reset Routine.................................. 3-3
3.1.1.8 Boot Mode Control................................................................................................... 3-4
3.1.1.9 Microprocessor 7.3975 MHz Clock.......................................................................... 3-4
3.1.1.10 Battery Gauge.......................................................................................................... 3-4
3.1.2 Audio Circuitry .................................................................................................................. 3-4
3.1.2.1 Transmit and Receive Low-Level Audio Circuitry.................................................... 3-4
3.1.2.2 Audio Power Amplifier ............................................................................................. 3-5
3.1.2.3 Internal Microphone Audio Voice Path .................................................................... 3-5
3.1.2.4 PTT Circuits.............................................................................................................3-6
3.1.2.5 VOX Operation ........................................................................................................ 3-6
3.1.2.6 Battery Charging Through Microphone Jack ........................................................... 3-6
3.1.2.7 Programming and Flashing Through Microphone Jack........................................... 3-6
Chapter 4 136-162 MHz VHF Theory Of Operation ............................ 4-1
4.1 Introduction.................................................................................................................................... 4-1
4.2 VHF Receiver ................................................................................................................................ 4-1
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