User Guide

GSM transmitter tunings

Tx IQ tuning (GSM)

Context

The Tx path branches to I and Q signals at RF I/Q modulator. Modulator and analog hardware located after

it cause unequal amplitude and phase disturbance to I and Q signal paths. Tx IQ tuning tuning balances the

I and Q branches.

Tx IQ tuning must be performed on all GSM bands. .

Steps

1. From the dropdown menus, set "Operating mode" to Local, "System mode" to GSM, and Band to GSM900.

2. From the Tuning menu, choose GSM -> Tx IQ Tuning.

3. Set Mode to Automatic and Edge to Off.

4. Click Start.

Wait until automatic tuning has finished and moved the sliders.

Values are written to the phone memory automatically.

RM-86

RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Issue 1 COMPANY CONFIDENTIAL Page 7 –31