Motorola CP150 - Page 4

ii Table of Contents
June, 2005 6880309N62-C
4.2.1 Receiver Front-End...........................................................................................................4-1
4.2.2 Receiver Back-End ...........................................................................................................4-2
4.3 VHF Transmitter.............................................................................................................................4-3
4.3.1 Transmit Power Amplifier..................................................................................................4-3
4.3.2 Antenna Switch.................................................................................................................4-3
4.3.3 Harmonic Filter..................................................................................................................4-3
4.3.4 Antenna Matching Network...............................................................................................4-4
4.3.5 Power Control ...................................................................................................................4-4
4.4 VHF Frequency Generation Circuitry.............................................................................................4-4
4.4.1 Fractional-N Synthesizer...................................................................................................4-5
4.4.2 Voltage Controlled Oscillator (VCO) .................................................................................4-6
Chapter 5 146-174 MHz VHF Theory Of Operation ............................ 5-1
5.1 Introduction ....................................................................................................................................5-1
5.2 VHF Receiver.................................................................................................................................5-1
5.2.1 Receiver Front-End...........................................................................................................5-1
5.2.2 Receiver Back-End ...........................................................................................................5-2
5.3 VHF Transmitter.............................................................................................................................5-3
5.3.1 Transmit Power Amplifier..................................................................................................5-3
5.3.2 Antenna Switch.................................................................................................................5-3
5.3.3 Harmonic Filter..................................................................................................................5-3
5.3.4 Antenna Matching Network...............................................................................................5-4
5.3.5 Power Control ...................................................................................................................5-4
5.4 VHF Frequency Generation Circuitry.............................................................................................5-4
5.4.1 Fractional-N Synthesizer...................................................................................................5-5
5.4.2 Voltage Controlled Oscillator (VCO) .................................................................................5-6
Chapter 6 VHF Troubleshooting Tables ............................................. 6-1
6.1 Troubleshooting Table for Receiver...............................................................................................6-1
6.2 Troubleshooting Table for Synthesizer ..........................................................................................6-3
6.3 Troubleshooting Table for Transmitter...........................................................................................6-4
6.4 Troubleshooting Table for Board and IC Signals...........................................................................6-7
Chapter 7 VHF Schematic Diagrams, Overlays, and Parts Lists...... 7-1
7.1 Introduction ....................................................................................................................................7-1
7.1.1 Notes For All Schematics and Circuit Boards...................................................................7-1
7.1.2 Six Layer Circuit Board .....................................................................................................7-3
7.2 Speaker and Microphone Schematic.............................................................................................7-3
7.2.1 Speaker and Microphone Parts List..................................................................................7-3
Chapter 7 VHF (136-162 MHz) Schematic Diagrams, Overlays, and
Parts Lists (8486769Z02-A) .............................................. 7-5
Figure 7-3. VHF (136-162 MHz) Radio Circuit Block Interconnect Diagram (8486769Z02-A) ...........7-5
Figure 7-4. VHF (136-162 MHz) Receiver Front End Schematic Diagram (8486769Z02-A)..............7-6
Figure 7-5. VHF (136-162 MHz) Receiver Back End Schematic Diagram (8486769Z02-A) ..............7-7