Rx Vhf (N701 Lo) Schematic - Nokia RM-11 Series Troubleshooting Manual

CC Technical Documentation

Rx VHF (N701 LO) Schematic

• Operates at a fixed frequency of 256.2MHz. It is the second LO for down-
conversion to I and Q for baseband processing. Refer to the frequency plan.
• Monitor probing point at C702 for N701 LO. A locked and stable 256.2MHz with
amplitude ~= -2.5dBm should be observed on the spectrum analyzer.
• Monitor control voltage at C715. The control voltage at locked state should be
between 1.2 and 1.7VDV for the proper operation of N701 LO.
Lock voltage
R esonator
Issue 2 09/2005
© 2005 Nokia Corporation
Troubleshooting - RF
Loop filter components
Confidential
RM-11
PLL i
Page 37