Nokia RH-6 Series Rf Description & Troubleshooting page 66

RH-6
7 - RF Description & Troubleshooting
The Spectrum Analyzer now shows a plot like this:
35
30
20
10
0
-10
-20
-30
-40
-50
-60
-65
Date:
Check the results in the TX IQ Tuning Window against the limits:
Value
Amplitude difference
Phase difference
Select in the TX IQ Tuning Window:
Select
Press
and the values are stored in the phone. The GSM1800 TX IQ Tuning is now finished.
Note: The optimum values for "TX I and Q Offset" and "Amplitude and Phase Differ-
ence" vary from phone to phone.
TX I/Q tuning GSM1800
Caution: In the case you use a spectrum analyzer make sure that the external
attenuation (20-30dB) between phone and spectrum analyzer is high
enough that the input of the analyzer can't be destroyed. Adjust the ref-
erence level offset according to the insertion loss from the phone to the
spectrum analyzer.
PC/Phone operation:
Page 66
Company Confidential
Marker 1 [T1]
Ref Lvl Ref Lvl 33.40 dBm
35 dBm 35 dBm 897.33229000 MHz
1
27.5 dB Offset
Center 897.4 MHz
14.JAN.2002 13:23:02
Typical
TX I DC offset
TX Q DC offset
Save to Product
Stop
Copyright © 2003 Nokia Corporation.
Company Confidential
CCS Technical Documentation
RBW 3 kHz RF Att
VBW 3 kHz
SWT 3 s Unit
1 [T1]
897.33229000 MHz
2 [T1]
897.40000000 MHz
3 [T1]
897.46771000 MHz
2
3
30 kHz/ Span 300 kHz
Limit min.
0.1 -6
0 -6
0 -1
87.5 80
30 dB
dBm
33.40 dBm
A
-20.35 dBm
-27.60 dBm
1MA
Limit max.
6
6
1
100
Issue 1 10/2003