Tx I/Q Tuning; Egsm900 - Nokia RH-29 Series Manual

RH-29
6b - RF Troubleshooting

TX I/Q tuning

This tuning must be done in both bands.

EGSM900

Caution: In case you use a spectrum analyser make sure that the external attenuation (20 - 30dB)
between phone and spectrum analyser is high enough that the input of the analyser can't be destroyed.
Adjust the reference level offset according to the insertion loss from the phone to the spectrum analy-
ser.
PC/Phone operation:
Set operating mode to local mode
Select
Wait until the TX IQ Tuning window pops up.
Select
Wait until the RF Controls 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.
Center Frequency
Frequency Span
Resolution Bandwidth
Video Bandwidth
Sweep Time
Sweep Type
Detector Type
Reference level
Marker 1
Marker 2
Marker 3
Page 24
Company Confidential
Tuning
TX IQ Tuning
Testing
RF Controls
Table 4:
EGSM900
897.4 MHz
200 kHz
3kHz
3kHz
3 sec.
Clear/Write
Max Peak
35 dBm
897.33229 MHz
897.4 MHz
897.46771 MHz
Copyright © 2004 Nokia Corporation
Company Confidential
Nokia Customer Care
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Issue 1 05/2004