Nokia RM-42 Service Manual

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Contents

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.Min MaxTx Freq Comp (the first and lastvalue)-4 +412. Close the tuning window.Tx LO leakage (WCDMA)ContextThe purpose of Tx LO leakage tuning is to minimize the carrier leakage of the IQ-modulator which is caused bythe 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 bestcombination for internal control words in order to produce minimum LO leakage.Steps1. From the "Operating mode" dropdown menu, set mode to "Local" from Product/System Mode menu, choose"WCDMA" to Selected System Mode and click Write. NOTE! After tuning is done change system mode back toDual by choosing "Free" to Selected System Mode and click Write.RM-42Nokia Customer Care RF Troubleshooting and Manual Tuning GuidePage 7–54 Company Confidential 9241872 (Issue 1)Copyright ©2005 Nokia. All Rights Reserved.