User Guide

10. To end the tuning, click "Finish" and "Close".

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 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

(or GSM850 on RM-24).

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-10;RM-24

RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Issue 1 COMPANY CONFIDENTIAL Page 7 –35