iii
6.8.2 Transmitter Circuit ....................................................................................... 126
6.8.3 FGU ............................................................................................................. 128
7. UHF3 (350-400 MHz) Information ................................................................................... 130
7.1 Transmitter Circuit ................................................................................................. 130
7.1.1 RF Power Amplifier Circuit .......................................................................... 130
7.1.2 Low-Pass Filter Circuit ................................................................................ 131
7.1.3 Auto Power Control Circuit .......................................................................... 131
7.2 Receiver Circuit ..................................................................................................... 132
7.2.1 Receiver Front-End ..................................................................................... 132
7.2.2 Receiver Back-End ...................................................................................... 133
7.3 FGU ....................................................................................................................... 134
7.3.1 Working Principle of PLL ............................................................................. 134
7.3.2 Working Principle of VCO ............................................................................ 135
7.3.3 Two-Point Modulation .................................................................................. 135
7.4 PCB View .............................................................................................................. 136
7.5 Block Diagram ....................................................................................................... 141
7.6 Schematic Diagram ............................................................................................... 146
7.7 Parts List ............................................................................................................... 169
7.8 Troubleshooting Flow Chart ................................................................................... 226
7.8.1 Receiver Circuit ........................................................................................... 226
7.8.2 Transmitter Circuit ....................................................................................... 228
7.8.3 FGU ............................................................................................................. 230
8. VHF (136-174 MHz) Information ..................................................................................... 232
8.1 Transmitter Circuit ................................................................................................. 232
8.1.1 RF Power Amplifier Circuit .......................................................................... 232
8.1.2 Low-Pass Filter Circuit ................................................................................ 233
8.1.3 Auto Power Control Circuit .......................................................................... 233
8.2 Receiver Circuit ..................................................................................................... 234
8.2.1 Receiver Front-End ..................................................................................... 234
8.2.2 Receiver Back-End ...................................................................................... 235
8.3 FGU ....................................................................................................................... 236
RDR9000 Service Manual
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