User Guide

CCS Technical Documentation
RH-20
Issue 1 10/2003 Copyright Nokia. All rights reserved.. Page 77
Tune LO leakage to minimum with TXI/TXQ DC Offset control (f0 on spectrum analyzer
screen).
Tune unwanted sideband to minimum using Amplitude/Phase difference controls (f0 +
67.71kHz on spectrum analyzer screen).
Tuning limits are the same for all bands (GSM/EDGE900, GSM/EDGE1800 and GSM/
EDGE1900):
When the IQ spectrum is balanced, “Save & Continue” to EDGE900 TX IQ tuning.
Spectrum analyzer settings are the same as for GSM900 IQ tuning.
Tuning limits:
I DC Offset -6…+6
Q DC Offset -6…+6
Amplitude difference -1…+1
Phase difference
- 80°…100°
A
Unit dB
m
21 dB Offset
Ref Lvl
33 dBm
Ref Lvl
33 dBm
RF Att 40 dB
Center 897.4 MHz Span 200 kHz20 kHz/
RBW 3 kHz
VBW 3 kHz
1MA
SWT 3 s
-60
-50
-40
-30
-20
-10
0
10
20
30
-67
33
1
1
2
Marker 1 [T1]
22.61 dBm
897.33246493 MHz
1 [T1] 22.61 dBm
897.33246493 MHz
1 [T1] -26.10 dB
67.77000000 kHz
2 [T1] -49.93 dB
135.87174348 kHz
Date: 3.JUN.2003 12:32:03