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Table of Contents
Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GP340 Model Chart .............................................................................................1-1
2.0 GP640 / GP680 Model Chart ...............................................................................1-1
3.0 Technical Specifications ......................................................................................1-2
Chapter 2 THEORY OF OPERATION
1.0 Introduction ..........................................................................................................2-1
2.0 Transmitter...........................................................................................................2-1
2.1 Power Amplifier ..............................................................................................2-1
2.2 Antenna Switch...............................................................................................2-2
2.3 Harmonic Filter ...............................................................................................2-2
2.4 Antenna Matching Network ............................................................................2-2
2.5 Power Control Integrated Circuit (PCIC) ........................................................2-2
3.0 Receiver...............................................................................................................2-3
3.1 Receiver Front-End ........................................................................................2-3
3.2 Receiver Back-End.........................................................................................2-4
3.3 Automatic Gain Control Circuit .......................................................................2-5
4.0 Frequency Generation Circuitry...........................................................................2-6
4.1 Synthesizer.....................................................................................................2-6
4.2 Voltage Controlled Oscillator (VCO)...............................................................2-8
Chapter 3 TROUBLESHOOTING CHARTS
1.0 Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)......................................3-1
2.0 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)......................................3-2
3.0 Troubleshooting Flow Chart for Transmitter ........................................................3-3
4.0 Troubleshooting Flow Chart for Synthesizer........................................................3-4
5.0 Troubleshooting Flow Chart for VCO...................................................................3-5
Chapter 4 PCB/SCHEMATICS/PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards .......................................................4-1
1.1 Controller Circuits...........................................................................................4-1
2.0 PCB 8485726Z01 - Schematics...........................................................................4-3
3.0 PCB 8485726Z01 - Parts List ............................................................................4-11
4.0 PCB 8485726Z04 - Schematics.........................................................................4-14
5.0 PCB 8485726Z04 - Parts List ............................................................................4-22
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