User Guide

5. When the values have been written to the phone memory, click Next to change to the next band.

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

Next actions

Tuning sliders should be close to the center of the scale after the tuning and within the limits specified in

the following table. If they are not within the limits, check Tx IQ quality manually.

Min Typ Max Unit

GSM900

I DC offset / Q DC

offset

-6 -4 4 6 dB

Ampl -1 0 1 dB

Phase 85 90 95 dB

GSM1800/GSM1900

I/Q DC -6 0.5 6 dB

Ampl -1 0 1 dB

Phase 95 100 110 dB

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.

RM-100

RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Issue 2 COMPANY CONFIDENTIAL Page 7 –41