User Guide

PAMS Technical Documentation 6 - Troubleshooting
NPE-4
Original ãNokia Corporation. Page 6-69
TX I/Q Tuning
This tuning must be done in both bands.
EGSM
Set operating mode to local mode
Select Maintenance Alt-M
Tuning T
TX IQ Tuning I
Wait until the TX IQ Tuning window pops up.
Connect a Spectrum Analyzer or GSM tester with the option *Narrow Spectrum' to the
RF connector of the phone.
If a spectrum analyzer is used then use the following settings.
Use an appropriate attenuator 10 or 20dB insertion loss and set the Reference Level Off-
set according to insertion loss from the phone to the Spectrum Analyzer.
Select Band GSM 900
Operation Mode Burst
RX/TX Channel 37
Select 'Load from Product'
Press Start
Select TX Data Type All1
EGSM
Center Frequency 897.4 MHz
Frequency Span 300 kHz
Resolution Bandwidth 3kHz
Video Bandwidth 3kHz
Sweep Time 3 sek.
Sweep Type Clear/Write
Detector Type Max Peak
Reference level 35 dBm
Marker 1 897.33229 MHz
Marker 2 897.4 MHz
Marker 3 897.46771 MHz