Section 5: i
6881091C63-F
Section 5: UHF Band 1 (403–470 MHz) 1–25 W
Service Information
Table of Contents
Chapter 1 Model Charts and Technical Specifications
1.0 UHF Band 1 (403–470 MHz) 1–25 W Model Charts ........................................5:1-1
1.1 CDM Series Model Chart ............................................................................5:1-1
1.2 PRO Series Model Chart.............................................................................5:1-2
2.0 Technical Specifications ...................................................................................5:1-2
Chapter 2 Theory of Operation
1.0 Introduction.......................................................................................................5:2-1
2.0 UHF Band 1 (403–470 MHz) 1–25 W Receiver Front-End...............................5:2-1
2.1 Receiver Front-End .....................................................................................5:2-1
2.2 Front-End Bandpass Filters and Pre-Amplifier............................................5:2-2
2.3 First Mixer and High Intermediate Frequency (IF).......................................5:2-2
2.4 Low Intermediate Frequency (IF) and Receiver Back-End .........................5:2-3
3.0 UHF Band 1 (403–470 MHz) 1–25W Transmitter Power Amplifier (PA) 25 W.5:2-3
3.1 First Power Controlled Stage ......................................................................5:2-4
3.2 Power Controlled Driver Stage....................................................................5:2-4
3.3 Final Stage ..................................................................................................5:2-4
3.4 Directional Coupler......................................................................................5:2-5
3.5 Antenna Switch ...........................................................................................5:2-5
3.6 Harmonic Filter............................................................................................5:2-5
3.7 Power Control..............................................................................................5:2-5
4.0 UHF Band 1 (403–470 MHz) 1–25 W Frequency Synthesis ............................5:2-6
4.1 Reference Oscillator....................................................................................5:2-6
4.2 Fractional-N Synthesizer.............................................................................5:2-6
4.3 Voltage Controlled Oscillator (VCO)............................................................5:2-8
4.4 Synthesizer Operation.................................................................................5:2-9
Chapter 3 Troubleshooting Charts
1.0 Troubleshooting Flow Chart for Receiver .........................................................5:3-1
2.0 Troubleshooting Flow Chart for 25 W Transmitter............................................5:3-3
3.0 Troubleshooting Flow Chart for Synthesizer.....................................................5:3-6
4.0 Troubleshooting Flow Chart for VCO................................................................5:3-7
5.0 Troubleshooting Flow Chart for PassPort.........................................................5:3-8
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