Table of Contents v
6880309N62-C June, 2005
8.4.2 Voltage Controlled Oscillator (VCO) ................................................................................. 8-6
Chapter 9 438-470 MHz UHF Theory Of Operation ............................ 9-1
9.1 Introduction.................................................................................................................................... 9-1
9.2 UHF Receiver ................................................................................................................................ 9-1
9.2.1 Receiver Front End........................................................................................................... 9-1
9.2.2 Receiver Back End ........................................................................................................... 9-2
9.3 UHF Transmitter ............................................................................................................................ 9-3
9.3.1 Transmitter Power Amplifier ............................................................................................. 9-3
9.3.2 Antenna Switch................................................................................................................. 9-3
9.3.3 Harmonic Filter ................................................................................................................. 9-3
9.3.4 Antenna Matching Network............................................................................................... 9-4
9.3.5 Power Control................................................................................................................... 9-4
9.4 UHF Frequency Generation Circuitry ............................................................................................ 9-4
9.4.1 Fractional-N Synthesizer .................................................................................................. 9-5
9.4.2 Voltage Controlled Oscillator (VCO) ................................................................................. 9-6
Chapter 10 465-495 MHz UHF Theory Of Operation .......................... 10-1
10.1 Introduction.................................................................................................................................. 10-1
10.2 UHF Receiver .............................................................................................................................. 10-1
10.2.1 Receiver Front End......................................................................................................... 10-1
10.2.2 Receiver Back End .........................................................................................................10-2
10.3 UHF Transmitter .......................................................................................................................... 10-3
10.3.1 Transmitter Power Amplifier ........................................................................................... 10-3
10.3.2 Antenna Switch............................................................................................................... 10-3
10.3.3 Harmonic Filter ............................................................................................................... 10-3
10.3.4 Antenna Matching Network............................................................................................. 10-4
10.3.5 Power Control................................................................................................................. 10-4
10.4 UHF Frequency Generation Circuitry ..........................................................................................10-4
10.4.1 Fractional-N Synthesizer ................................................................................................ 10-5
10.4.2 Voltage Controlled Oscillator (VCO) ............................................................................... 10-6
Chapter 11 UHF Troubleshooting Tables........................................... 11-1
11.1 Troubleshooting Table for Receiver............................................................................................. 11-1
11.2 Troubleshooting Table for Synthesizer........................................................................................ 11-3
11.3 Troubleshooting Table for Transmitter......................................................................................... 11-4
11.4 Troubleshooting Table for Board and IC Signals......................................................................... 11-6
Chapter 12 UHF Schematic Diagrams, Overlays, and Parts Lists ... 12-1
12.1 Introduction.................................................................................................................................. 12-1
12.1.1 Notes For All Schematics and Circuit Boards................................................................. 12-1
12.1.2 Six Layer Circuit Board...................................................................................................12-3
12.2 Speaker and Microphone Schematic........................................................................................... 12-3
12.2.1 Speaker and Microphone Parts List................................................................................ 12-3
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