CC Technical Documentation Troubleshooting - RF
RM-11
Issue 2 09/2005 ©2005 Nokia Corporation Confidential Page 37
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.
Loop filter components
PLL
Lock voltage
Resonator
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