Rx Vhf Vco - Nokia RH-21 Series Troubleshooting Manual

RH-21
Troubleshooting

RX VHF VCO

The RX VHF VCO signal is used to generate receiver Intermediate frequency. RX VHF VCO
has one fixed frequency (271.08 MHz). Operating frequency is locked in Phase-locked
loop.
RX VHF VCO output signal is fed to Safari. The inside of the Safari signal is divided into
the Phase detector and RX parts. Before I/Q modulator frequency is divided by 2.
Fault-finding chart for RX VHF VCO
Measure oscillator frequency over L730 coil. Don´t connect probe to pads!
AMPS, CH383
Page 36
Nokia Corporation Confidential
CCS Technical Documentation
Issue 1 05/2003