Gsm Transmitter Tunings; Tx Iq Tuning (Gsm) - Nokia RM-132 Service Manual & Parts Manual

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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.
Page 7 –38 COMPANY CONFIDENTIAL
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RF Troubleshooting and Manual Tuning Guide
RM-132; RM-133
Issue 1