i
Table of Contents
Chapter 1
MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GM140/GM160 Model Chart................................................................................1-1
2.0 GM340/GM360/GM380 Model Chart ...................................................................1-2
3.0 GM640/GM660/GM1280 Model Chart .................................................................1-2
4.0 Technical Specifications ......................................................................................1-4
Chapter 2
THEORY OF OPERATION
1.0 Introduction ..........................................................................................................2-1
2.0 VHF (136-174MHz) Receiver...............................................................................2-1
2.1 Receiver Front-End .......................................................................................2-1
2.2 Front-End Band-Pass Filters & Pre-Amplifier .................................................2-2
2.3 First Mixer and High Intermediate Frequency (IF)..........................................2-2
2.4 Low Intermediate Frequency (IF) and Receiver Back End.............................2-3
3.0 VHF (136-174MHz) Transmitter Power Amplifier (PA) 25 W ...............................2-3
3.1 First Power Controlled Stage..........................................................................2-4
3.2 Power Controlled Driver Stage .......................................................................2-4
3.3 Final Stage......................................................................................................2-4
3.4 Directional Couple
r
.........................................................................................2-5
3.5 Antenna Switch...............................................................................................2-5
3.6 Harmonic Filter ...............................................................................................2-5
3.7 Power Control.................................................................................................2-5
4.0 VHF (136-174MHz) Frequency Synthesis ...........................................................2-6
4.1 Reference Oscillator .......................................................................................2-6
4.2 Fractional-N Synthesizer ................................................................................2-6
4.3 Voltage Controlled Oscillator (VCO) ...............................................................2-7
4.4 Synthesizer Operation ....................................................................................2-8
5.0 VHF (136-174MHz) Transmitter Power Amplifier (PA) 45 W ..............................2-9
5.1 Power Controlled Stage..................................................................................2-9
5.2 Pre-Driver Stage ...........................................................................................2-10
5.3 Driver Stage..................................................................................................2-10
5.4 Final Stage....................................................................................................2-10
5.5 Directional Couple
r
.......................................................................................2-10
5.6 Antenna Switch.............................................................................................2-11
5.7 Harmonic Filter .............................................................................................2-11
5.8 Power Control...............................................................................................2-11
Summary of Contents for 6864115B62-C
Page 1: ...Professional Radio GM Series Detailed Service Manual 6864115B62 C ...
Page 2: ...ii ...
Page 4: ...iv ...
Page 5: ...Professional Radio GM Series Service Maintainability Issue July 2007 ...
Page 8: ...ii ...
Page 22: ...2 10 MAINTENANCE ...
Page 25: ...Professional Radio GM Series Controlhead Service Information Issue July 2007 ...
Page 77: ...Professional Radio GM Series Controller Service Information Issue May 2007 ...
Page 100: ...2 2 TROUBLESHOOTING CHARTS ...
Page 104: ...3 4 Controller schematics parts list ...
Page 154: ...3 52 Controller T12 Schematic Diagrams ...
Page 155: ...Professional Radio GM Series VHF 136 174MHz Service Information Issue May 2007 ...
Page 164: ...1 6 MODEL CHART AND TECHNICAL SPECIFICATIONS ...
Page 176: ...2 12 THEORY OF OPERATION ...
Page 186: ...3 10 TROUBLESHOOTING CHARTS ...
Page 190: ...4 4 VHF PCB SCHEMATICS PARTS LISTS ...
Page 252: ...4 66 VHF 1 25W PCB 8471235L02 Schematics VHF 136 174 MHz IF ...
Page 256: ...4 70 VHF 1 25W PCB 8471235L02 Schematics ...
Page 257: ...Professional Radio GM Series UHF 403 470MHz Service Information Issue May 2007 ...
Page 266: ...1 6 MODEL CHART AND TECHNICAL SPECIFICATIONS ...
Page 366: ...2 12 THEORY OF OPERATION ...
Page 372: ...3 6 Low Band TROUBLESHOOTING CHARTS ...