User Guide

Tx power level tuning (GSM)

Context

Because of variations at IC process and discrete component values, the actual transmitter RF gain of each

phone is different. Tx power level tuning is used to find out mapping factors called 'power coefficients’. These

adjust the GSM transmitter output power to fulfill the specifications.

For EDGE transmission the bias settings of the GSM PA are adjusted in order to improve linearity. This affects

the PA gain and hence the power levels have to be aligned separately for EDGE transmission.

Tx power level tuning has to be performed on all GSM bands.

Steps

1. Connect the phone to a spectrum analyzer.

2. Start Phoenix service software.

3. From the "Operating mode" dropdown menu, set mode to "Local".

4. From the Tuning menu, choose GSM -> Tx Power Level Tuning.

RM-208

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Page 7 –30 COMPANY CONFIDENTIAL Issue 1