Transmitter Tunings; Tx Iq Tuning - Nokia RM-57 Service Manual

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7. Click Tune.
8. Check that the RSSI level value is between the limits presented in this table. If this is not the case, try clicking
the Tune button again.
Band
GSM850/GSM900
GSM1800
GSM1900
9. Make sure that the "Save to Phone" check box is checked and click Stop.
Next action
Repeat steps 3 to 7 for GSM1800 and GSM1900.

Transmitter tunings

Tx IQ tuning

Context
The Tx path branches to I and Q signals at the RF I/Q modulator. Modulator and analog hardware located after
the modulator cause unequal amplitude and phase disturbance to I and Q signal paths. Tx IQ tuning balances
the I and Q branches.
Page 7–30
Table 16 RSSI level values
Min
-115
-115
-115
Company Confidential
Copyright ©2005 Nokia. All Rights Reserved.
RF Troubleshooting and Manual Tuning Guide
Max
-90
-85
-100
RM-57/58
Unit
dB
dB
dB
Issue 1