Motorola CDM Series Detailed Service Manual page 525

Section 10: UHF Band 2 (450-512/520 MHz) 25-40W
Bipolar Service Information
Table of Contents
Chapter 1 Model Charts and Technical Specifications
1.0 UHF Band 2 (450-512/520 MHz) 25-40 W Bipolar Model Charts .................10:1-1
1.1 CDM Series Model Chart ..........................................................................10:1-1
1.2 PRO Series Model Chart...........................................................................10:1-2
2.0 Technical Specifications .................................................................................10:1-2
Chapter 2 Theory of Operation
1.0 Introduction .....................................................................................................10:2-1
2.0 UHF Band 2 (450-512/520 MHz) 25-40 W Bipolar Receiver Front-End .......10:2-1
2.1 Receiver Front-End ...................................................................................10:2-1
2.2 Front-End Bandpass Filters and Pre-Amplifier..........................................10:2-2
2.3 First Mixer and High Intermediate Frequency (IF).....................................10:2-2
2.4 Low Intermediate Frequency (IF) and Receiver Back-End .......................10:2-2
3.0 UHF Band 2 (450-512/520 MHz) 25-40 W Bipolar Transmitter Power
Amplifier (PA) 40W .........................................................................................10:2-3
3.1 Power Controlled Stage ............................................................................10:2-3
3.2 Pre-Driver Stage........................................................................................10:2-4
3.3 Driver Stage ..............................................................................................10:2-4
3.4 Final Stage ................................................................................................10:2-4
3.5 Bi-directional Coupler ................................................................................10:2-4
3.6 Antenna Switch .........................................................................................10:2-4
3.7 Harmonic Filter ..........................................................................................10:2-5
3.8 Power Control............................................................................................10:2-5
4.0 UHF Band 2 (450-512/520 MHz) 25-40 W Bipolar Frequency Synthesis .....10:2-5
4.1 Reference Oscillator..................................................................................10:2-5
4.2 Fractional-N Synthesizer ...........................................................................10:2-6
4.3 Voltage Controlled Oscillator (VCO)..........................................................10:2-7
4.4 Synthesizer Operation...............................................................................10:2-8
Chapter 3 Troubleshooting Charts
1.0 Troubleshooting Flow Chart for Receiver .......................................................10:3-1
2.0 Troubleshooting Flow Chart for 40 W Transmitter..........................................10:3-3
3.0 Troubleshooting Flow Chart for Synthesizer...................................................10:3-4
4.0 Troubleshooting Flow Chart for VCO..............................................................10:3-5
5.0 Troubleshooting Flow Chart for PassPort.......................................................10:3-6
Section 10: i
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