User Guide

CCS Technical Documentation 3 - Service Software
Company Confidential NMM-3
Issue 1 (11/2003) Copyright  2003 Nokia Corporation Page 3-31
Company Confidential
• Tune LO leakage to minimum with TXI/TXQ DC offset control (f0 on spectrum
analyser screen)
• Tune unwanted sideband (fo + 67kHz) to minimum using Amplitude/Phase differ-
ence controls
Typical TX IQ Tuning Values and tuning limits GSM 900:
• If values shown are within limits, check the “Save & Continue” to save the new
values to the product
Parameter Typ. Value Low Limit High Limit
I DC Offset -2.5…+0.5 -6 +6
Q DC Offset -2.5…+0.5 -6 +6
Amplitude difference -0.2…+0.2 -1 +1
Phase difference 88.0°….92.0° 80° 100°