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Chapter 7 – VHF Low Power Service Information
Table of Contents
Section 1 Troubleshooting Charts
1.0 Troubleshooting Flow Chart for Receiver ............................................................ 1-1
2.0 Troubleshooting Flow Chart for 25W Transmitter................................................ 1-4
3.0 Troubleshooting Flow Chart for RFIC .................................................................. 1-5
4.0 Troubleshooting Flow Chart for Rx VCO ........................................................... 1-10
5.0 Troubleshooting Flow Chart for Tx VCO............................................................ 1-12
Section 2 VHF PCB/Schematics/Parts List
1.0 Allocation of Schematics and Circuit Boards ....................................................... 2-1
1.1 VHF 25W Circuits........................................................................................... 2-1
2.0 VHF (136–174 MHz) 1–25W PCB/Schematics/Parts List ................................... 2-3
VHF (136–174 MHz) 1–25W 84012734001-A Top Side ........................................ 2-3
VHF (136–174 MHz) 1–25W 84012734001-A Bottom Side................................... 2-4
VHF (136–174 MHz) 1–25W Overall Schematic Diagram ..................................... 2-5
VHF (136–174 MHz) 1–25W Receiver Front-End Schematic Diagram.................. 2-6
VHF (136–174 MHz) 1–25W Receiver IF Amp Schematic Diagram...................... 2-7
VHF (136–174 MHz) 1–25W Transmitter Power Amplifier Schematic Diagram .... 2-8
VHF (136–174 MHz) 1–25W Power Control Schematic Diagram .......................... 2-9
VHF (136–174 MHz) 1–25W Transmitter Power Amplifier DC Distribution
Schematic Diagram ...................................................................................... 2-10
VHF (136–174 MHz) 1–25W RFIC Schematic Diagram ...................................... 2-11
VHF (136–174 MHz) 1–25W Receiver VCO Schematic Diagram........................ 2-12
VHF (136–174 MHz) 1–25W Transmit VCO Schematic Diagram ........................ 2-13
VHF (136–174 MHz) 1–25W VCO Buffer Schematic Diagram ............................ 2-14
VHF PCB 84012734001-A Parts List 1–25W....................................................... 2-15