User Guide

Nokia Customer Care Troubleshooting
Company Confidential RH-21
Issue 2 07/2004  2004 Nokia Corporation. Page 37
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