Tx Power Level Tuning (Gsm) - Nokia n80 User Manual
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5. When the values have been written to the phone memory, click Next to change to the next band.
6. When all bands have been tuned, click Finish and Close to end the tuning procedure.
Next action
Tuning sliders should be close to the center of the scale after the tuning and within the limits specified in
the following table. If they are not within the limits, check Tx IQ quality manually.
GSM850/GSM900
I DC offset / Q DC
offset
Ampl
Phase
GSM1800/GSM1900
I/Q DC
Ampl
Phase
Tx power level tuning (GSM)
Context
Because of variations at IC process and discrete component values, the actual transmitter RF gain of each
phone is different. Tx power level tuning is used to find out mapping factors called 'power coefficients'. These
adjust the GSM transmitter output power to fulfill the specifications.
Page 7 –42
Min
-6
-1
85
-6
-1
95
COMPANY CONFIDENTIAL
Copyright © 2006 Nokia. All rights reserved.
RF Troubleshooting and Manual Tuning Guide
Typ
-4 4
0
90
0.5
0
100
RM-91; RM-92
Max
6
1
95
6
1
110
Unit
dB
dB
dB
dB
dB
dB
Issue 1
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