User Guide

NMM-3 Company Confidential
3 - Service Software CCS Technical Documentation
Page 3-32 Copyright  2003 Nokia Corporation Issue 1 (11/2003)
Company Confidential
• Continue tuning from GSM1800
• Set spectrum analyser to the settings on the screen
• Repeat the same steps as for the EGSM900 band
Typical TX IQ Tuning Values and tuning limits GSM1800:
• If values shown are within limits, select the “Save & Continue” to save the new
values to the product
• Close the “TX I/Q Tuning” – dialog to end tuning
TX Power Level Tuning
• Vector Signal Analyser (or spectrum analyser) needed
• With Tx Power Level Tuning, the coefficients are adjusted for each power level
• Must be done separately on both bands!
• Start Power Level tuning at EGSM (GSM900) Edge OFF band, then continue for
GSM1800 Edge OFF band
• In EGSM900 band the power level tuning is made for both high and low PA
Modes
• In GSM1800 band only for high PA mode
• Remember to take jig and cable attenuations into account!
• Tuning > GSM > Tx power level tuning
Parameter Typ. Value Low Limit High Limit
I DC Offset -3.0…0.0 -6 +6
Q DC Offset -1.5…+1.0 -6 +6
Amplitude difference -0.5…+0.0 -1 +1
Phase difference 90.0°…97.0° 80° 100°