Nokia 6111 RM-82 Service Manual page 199

RM-82
RF troubleshooting
3. Select correct settings for the band you are tuning. The following table summarises the settings of the RF
control window for IQ tuning of the three bands.
Band
GSM900
GSM1800
GSM1900
4. Start IQ tuning by pressing Start button in the
The purpose of this tuning is to reduce the frequency components at marker 2 (carrier leakage) and marker
3 (+67kHz/upper sideband) as much as possible.
Figure 112 Spectrum analyzer screen shot when performing IQ tuning, part 1 (example)
5. Adjust the 'TXI DC Offset' and the 'TXQ DC Offset' buttons in the
level (marker 2) reaches a minimum.
Issue 1
Table 14 RF Control window settings
TX Data Type
All 1
All 1
All 1
TX IQ Tuning window.
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TX Power Level
5
0
0
TX IQ Tuning window so that the carrier
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RX/TX Channel
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