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8.3 Dual Tone Multiple Frequency (DTMF) Data ............................................... 2-18

9.0 Receive Audio Circuits....................................................................................... 2-19

9.1 Squelch Detect ............................................................................................. 2-19

9.2 Audio Processing and Digital Volume Control.............................................. 2-20

9.3 Audio Amplification Speaker (+) Speaker (-) ................................................2-20

9.4 Handset Audio..............................................................................................2-21

9.5 Filtered Audio and Flat Audio .......................................................................2-21

10.0 Receive Signalling Circuits ................................................................................2-21

10.1 Sub-Audio Data (PL/DPL) and High Speed Data Decoder ..........................2-21

10.2 Alert Tone Circuits........................................................................................ 2-22

Chapter 3 TROUBLESHOOTING CHARTS

1.0 Troubleshooting Flow Chart for Receiver RF (Sheet 1 of 2)................................3-2

1.1 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2) ................................3-3

2.0 Troubleshooting Flow Chart for 25W Transmitter (Sheet 1 of 3) .........................3-4

2.1 Troubleshooting Flow Chart for 25W Transmitter (Sheet 2 of 3).................... 3-5

2.2 Troubleshooting Flow Chart for 25W Transmitter (Sheet 3 of 3).................... 3-6

3.0 Troubleshooting Flow Chart for Synthesizer........................................................3-7

4.0 Troubleshooting Flow Chart for VCO...................................................................3-8

5.0 Troubleshooting Flow Chart for DC Supply (1 of 2).............................................3-9

5.1 Troubleshooting Flow Chart for DC Supply (2 of 2) .....................................3-10

Chapter 4 VHF1 PCB/ SCHEMATICS/ PARTS LISTS

1.0 Allocation of Schematics and Circuit Boards .......................................................4-1

1.1 VHF1 and Controller Circuits..........................................................................4-1

2.0 VHF 1-25W Band 1 PCB 8486672Z01 / Schematics ..........................................4-3

2.1 VHF1 PCB 8486672Z01 Parts List 1-25W...................................................4-19

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