11. Check the "Save to Phone" check box and click Stop if the values are within the limits.
Next actions
Repeat the steps 4 to 10 for GSM850, GSM1800 and GSM1900.
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-88
Nokia Customer Care RF Troubleshooting and Manual Tuning Guide
Page 7 –30 COMPANY CONFIDENTIAL Issue 1
Copyright © 2006 Nokia. All rights reserved.
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