User Guide

RM-14

Nokia Customer Care RF Troubleshooting and Manual Tuning

40 COMPANY CONFIDENTIAL ISSUE 1 11/04

■ TX I/Q tuning

Spectrum analyzer is needed.

Tx IQ tuning allows changing the Tx I DC Offset, Tx Q DC Offset, Amplitude difference and

Phase difference.

Must be performed separately on all bands

TX I/Q tuning steps are:

• EGSM (GSM900) with EDGE off

• EGSM with EDGE on

• GSM1800 with EDGE off

• GSM1800 with EDGE on

• GSM1900 with EDGE off

• GSM1900 with EDGE on

Remember to take jig and cable attenuations into account!

Select Tuning => TX IQ Tuning

EGSM900 band with EDGE Off

Select “Start” to begin tuning at EGSM900 band with EDGE off.

Set spectrum analyzer to required settings => OK

The tuning is carried out by setting each of the sliders to desired value. The sliders can be

changed only when the tuning is ongoing.