Tx Lo Leakage (Wcdma) - Nokia n81 Service Manual

RM-179; RM-223
RF troubleshooting
Tx Freq Comp (the first and last
value)
17. To save the tuned values to the terminal, click Write.
Tx Band Response Calibration window.
18. Close the

Tx LO leakage (WCDMA)

Context
The purpose of Tx LO leakage tuning is to minimize the carrier leakage of the IQ-modulator which is caused
by the DC offset voltages in the Tx IQ-signal lines and in the actual IQ modulator.
The tuning improves WCDMA Tx AGC dynamics at low power levels. A self-calibration routine selects the best
combination for internal control words in order to produce minimum LO leakage.
Steps
1. From the Operating mode drop-down menu, set mode to Local.
2. Choose Tuning→WCDMA→ Tx LO Leakage .
3. Click Tune.
4. To end the tuning, click Close.
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