
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.
Table 14 RF Control window settings
Band
TX Data Type
TX Power Level
RX/TX Channel
GSM900
All 1
5
37
GSM1800
All 1
0
700
GSM1900
All 1
0
661
4. Start IQ tuning by pressing Start button in the
TX IQ Tuning
window.
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
TX IQ Tuning
window so that the carrier
level (marker 2) reaches a minimum.
RM-82
RF troubleshooting
Nokia Customer Care
Issue 1
COMPANY CONFIDENTIAL
Page 8 –21
Copyright © 2005 Nokia. All rights reserved.
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