User Guide

7. When the first values have been written to the phone memory, click Next to continue to the next band.

8. Go through all bands.

9. When all bands have been tuned, click Finish, and Close to end the tuning procedure.

Next action

If the tuning values are not within the limits specified in the "Tx IQ tuning limits" table, start the procedure

again, and check the Tx IQ quality manually.

Tx power level tuning (GSM)

Context

Because of variations in the integrated circuit 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 therefore 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 drop-down menu, set mode to Local.

4. Choose Tuning→GSM→Tx Power Level Tuning.

5. Click Start.

The current coefficients saved in the permanent memory (PM) of the terminal are shown.

RM-49

RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Issue 1 COMPANY CONFIDENTIAL Page 7 –29