Tx Vhf Schematic - Nokia RM-11 Series Troubleshooting Manual

CC Technical Documentation

Tx VHF Schematic

• There are two fixed LOs — 346.2MHz for Cell band and 416.2MHz for PCS band.
This is the first LO for up-conversion. Refer to frequency plan.
• Monitor probing point at C638 with a high-impedance RF probe for N601 LO. A
sufficiently strong and stable signal should be observed on the spectrum
analyzer.
• Monitor control voltage at C632. At this control voltage, the N601 LO is locked (it
should be between 1.2 and 1.8VDC).
R esonator
Issue 2 09/2005
N601
© 2005 Nokia Corporation
Troubleshooting - RF
Lock voltage
Confidential
RM-11
Loop filter
Page 39