11. Check the "Save to Phone" check box and click Stop if the values are within the limits.
Next action
Repeat the steps 4 to 10 for GSM1800 and GSM1900.
TX manual tuning
TX power level tuning (GSM)
Context
Because of variations at the 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.
For EDGE transmission the bias settings of the GSM PA are adjusted in order to improve linearity. This affects
the PA gain and hence the power levels have to be aligned separately for EDGE transmission.
TX power level tuning has to be performed on all GSM bands.
Steps
1.
Connect the phone to a spectrum analyzer.
2.
From the drop down menus, set "Operating mode" to Local, "System mode" to GSM, and select band.
Begin tuning GSM900.
RM-82
Nokia Customer Care
RF troubleshooting
Page 8 –14
COMPANY CONFIDENTIAL
Issue 1
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