Nokia 6680 RM-36 Service Manual page 244

Nokia Customer Care
Video bandwidth:
Trigger:
Markers:
4. Click Start and OK.
5. Adjust the "Mid Channel Power Level" to 21.0 dBm.
6. Click Accept and OK.
7. Read the marker power level on the low channel and fill it in to the "Low Power Level" line.
8. Click Accept and OK.
9. Read the marker power level on the high channel and fill it in to the "High Power Level" line.
10. Click Accept.
11. Check that the tuned values are within the limits presented in the following table. If they are OK, click Yes.
Tx Freq Comp (the first and last
value)
12. Close the tuning window.
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.
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Min
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Company Confidential
Copyright ©2005 Nokia. All Rights Reserved.
RF Troubleshooting and Manual Tuning Guide
more than 4.7 MHz (i.e. 5MHz)
Free run
1922.4 MHz, 1950.0 MHz and 1977.6 MHz
Max
+4
RM-36
Issue 1