Motorola GP338

vii
UHF Controls And Switches Schematic Diagram ..............................................6A-17
UHF Receiver Front End Schematic Diagram....................................................6A-18
UHF Receiver Back End Schematic Diagram....................................................6A-19
UHF Synthesizer Schematic Diagram................................................................6A-20
UHF Voltage Controlled Oscillator Schematic Diagram.....................................6A-21
UHF Transmitter Schematic Diagram ................................................................6A-22
UHF Radio Parts List..........................................................................................6A-23
8.0 Circuit Board/Schematic Diagrams and Parts List...........................................6A-26
UHF (403-470MHz) Main Board Top Side PCB No. 8480450Z13.....................6A-26
UHF (403-470MHz) Main Board Bottom Side PCB No. 8480450Z13................6A-27
UHF Controls And Switches Schematic Diagram ..............................................6A-28
UHF Receiver Front End Schematic Diagram....................................................6A-29
UHF Receiver Back End Schematic Diagram....................................................6A-30
UHF Synthesizer Schematic Diagram................................................................6A-31
UHF Voltage Controlled Oscillator Schematic Diagram.....................................6A-32
UHF Harmonic Filter Schematic Diagram ..........................................................6A-33
UHF Transmitter Schematic Diagram ................................................................6A-34
UHF Radio Parts List..........................................................................................6A-35
9.0 Troubleshooting charts....................................................................................6A-39
Troubleshooting Flow Chart for Controller .........................................................6A-39
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)....................................6A-40
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)....................................6A-41
Troubleshooting Flow Chart for Transmitter.......................................................6A-42
Troubleshooting Flow Chart for Synthesizer ......................................................6A-43
Troubleshooting Flow Chart for VCO .................................................................6A-44
Section 6B Model Chart and Test Specifications (136-174 Mhz)
1.0 Model Chart.......................................................................................................6B-1
2.0 Specifications.....................................................................................................6B-3
3.0 Transmitter.........................................................................................................6B-4
3.1 General.........................................................................................................6B-4
4.0 Receiver.............................................................................................................6B-6
4.1 Receiver Front-End......................................................................................6B-6
4.2 Receiver Back-End.......................................................................................6B-7
4.3 Automatic Gain Control Circuit.....................................................................6B-8
5.0 Frequency Generation Circuitry.........................................................................6B-9
5.1 Synthesizer.................................................................................................6B-10
5.2 VCO - Voltage Controlled Oscillator...........................................................6B-11
6.0 Notes For All Schematics and Circuit Boards..................................................6B-13
7.0 Circuit Board/Schematic Diagrams and Parts List...........................................6B-15
VHF (136-174MHz) Main Board Top Side PCB No. 8486062B09.....................6B-15
VHF (136-174MHz) Main Board Bottom Side PCB No. 8486062B09................6B-16
VHF (136-174MHz) Main Board Top Side PCB No. 8486062B12.....................6B-17
VHF (136-174MHz) Main Board Bottom Side PCB No. 8486062B12................6B-18
VHF Controls And Switches Schematic Diagram...............................................6B-19