Section 8: i
6881091C63-F
Section 8: VHF (136–174 MHz) 25–45 W Bipolar
Service Information
Table of Contents
Chapter 1 Model Charts and Technical Specifications
1.0 VHF (136–174 MHz) 25–45 W Bipolar Model Charts.......................................8:1-1
1.1 CDM Series Model Chart ............................................................................8:1-1
1.2 PRO Series Model Chart.............................................................................8:1-2
2.0 Technical Specifications ...................................................................................8:1-2
Chapter 2 Theory of Operation
1.0 Introduction.......................................................................................................8:2-1
2.0 VHF (136–174 MHz) 25–45 W Bipolar Receiver Front-End.............................8:2-1
2.1 Receiver Front-End .....................................................................................8:2-1
2.2 Front-End Bandpass Filters and Pre-Amplifier............................................8:2-2
2.3 First Mixer and 1st Intermediate Frequency (IF) .........................................8:2-2
2.4 2nd Intermediate Frequency (IF) and Receiver Back-End..........................8:2-2
3.0 VHF (136–174 MHz) 25–45 W Bipolar Transmitter Power Amplifier
(PA) 45 W .........................................................................................................8:2-3
3.1 Power Controlled Stage ..............................................................................8:2-3
3.2 Pre-Driver Stage..........................................................................................8:2-4
3.3 Driver Stage ................................................................................................8:2-4
3.4 Final Stage ..................................................................................................8:2-4
3.5 Directional Coupler......................................................................................8:2-4
3.6 Antenna Switch ...........................................................................................8:2-4
3.7 Harmonic Filter............................................................................................8:2-5
3.8 Power Control..............................................................................................8:2-5
4.0 VHF (136–174 MHz) 25–45 W Bipolar Frequency Synthesis...........................8:2-5
4.1 Reference Oscillator....................................................................................8:2-5
4.2 Fractional-N Synthesizer.............................................................................8:2-6
4.3 Voltage Controlled Oscillator (VCO)............................................................8:2-7
4.4 Synthesizer Operation.................................................................................8:2-8
Chapter 3 Troubleshooting Charts
1.0 Troubleshooting Flow Chart for Receiver .........................................................8:3-1
2.0 Troubleshooting Flow Chart for 45 W Transmitter............................................8:3-3
3.0 Troubleshooting Flow Chart for Synthesizer.....................................................8:3-5
4.0 Troubleshooting Flow Chart for VCO................................................................8:3-6
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