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Motorola VHF2 Manuals
Manuals and User Guides for Motorola VHF2. We have
1
Motorola VHF2 manual available for free PDF download: Service Information
Motorola VHF2 Service Information (68 pages)
CM Radios
Brand:
Motorola
| Category:
Radio
| Size: 1.81 MB
Table of Contents
Table of Contents
3
Model Chart and Technical Specifications
5
CM140/CM340/CM160/CM360 Model Chart
5
Technical Specifications
6
Theory of Operation
9
Introduction
9
VHF (146-174Mhz) Receiver
9
Receiver Front-End
9
Receiver Back-End
10
First Power Controller Stage
10
Power Controlled Driver Stage
11
Final Stage
11
Directional Coupler
11
Antenna Switch
11
Harmonic Filter
12
Power Control
12
VHF (146-174Mhz) Frequency Synthesis
12
Reference Oscillator
12
Fractional-N Synthesizer
13
Voltage Controlled Oscillator (VCO)
14
Synthesizer Operation
15
Controller Theory of Operation
16
Radio Power Distribution
16
Protection Devices
18
Automatic On/Off
18
Microprocessor Clock Synthesiser
19
Serial Peripheral Interface (SPI)
20
SBEP Serial Interface
20
Normal Microprocessor Operation
21
Static Random Access Memory
22
Control Board Audio and Signalling Circuits
22
Audio Signalling Filter IC and Compander (ASFIC CMP)
22
Transmit Audio Circuits
23
Microphone Input Path
23
PTT Sensing and TX Audio Processing
24
Transmit Signalling Circuits
25
Sub-Audio Data (PL/DPL)
25
High Speed Data
26
Dual Tone Multiple Frequency (DTMF) Data
26
Receive Audio Circuits
27
Squelch Detect
27
Audio Processing and Digital Volume Control
28
Audio Amplification Speaker (+) Speaker
28
Handset Audio
29
Filtered Audio and Flat Audio
29
Sub-Audio Data (PL/DPL) and High Speed Data Decoder
29
Alert Tone Circuits
30
Troubleshooting Charts
31
Troubleshooting Flow Chart for Receiver RF (Sheet 1 of 2)
32
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
33
Troubleshooting Flow Chart for 25W Transmitter (Sheet 1 of 3)
34
Troubleshooting Flow Chart for 25W Transmitter (Sheet 2 of 3)
35
Troubleshooting Flow Chart for 25W Transmitter (Sheet 3 of 3)
36
Troubleshooting Flow Chart for Synthesizer
37
Troubleshooting Flow Chart for VCO
38
Troubleshooting Flow Chart for DC Supply (Sheet 1 of 2)
39
Troubleshooting Flow Chart for DC Supply (Sheet 2 of 2)
39
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