NHL-10
CCS Technical Documentation RF Troubleshooting
30 COMPANY CONFIDENTIAL ISSUE 2 01/2004
Copyright © 2003 Nokia. All Rights Reserved.
Transmitter Tuning
Introduction
In the transmitter, there are two kinds of tunings that can be performed. These are IQ-tuning
and power level tuning. In general, different repairs require different tunings. In order to decide
which tuning is necessary after a repair, it is important to understand well the functionality of
the repaired circuit. In general, it is recommended that if any TX component is changed, both
these tunings are done.
Note: All tunings are done in local mode using Phoenix to control the phone.
TX IQ Tuning
The tuning must be carried out in all three bands. In addition to Phoenix, a spectrum analyzer
(SA) is needed. Connect the SA to the RF connector of the module jig. The settings of the spec-
trum analyzer will depend on the band to be tuned. The following table summarizes the settings
for each of the three bands.
For this tuning, two windows of Phoenix must be open: (1) Testing -> RF Controls, and (2)
Tuning -> TX IQ Tuning, as seen in figures below.
Table 1: Spectrum Analyzer Settings
EGSM900 GSM1800 GSM1900
Center frequency
897.4MHz 1747.8MHz 1880MHz
Frequency span
300kHz 300kHz 300kHz
Resolution
Bandwidth
3kHz 3kHz 3kHz
Video Bandwidth
3kHz 3kHz 3kHz
Sweep Time
3 sec 3 sec 3 sec
Trace Type
Clear/Write Clear/Write Clear/Write
Detector Type
Max Peak Max Peak Max Peak
Reference Level
35dBm 35dBm 35dBm
Marker 1
897.33229 MHz 1747.73229 MHz 1879.93229 MHz
Marker 2
897.4MHz 1747.8MHz 1880MHz
Marker 3
897.46771MHz 1747.86771MHz 1880.06771MHz
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