Gsm Transmitter Tunings - Nokia 6680 RM-36 Service Manual

RM-36
RF Troubleshooting and Manual Tuning 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.
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