Gsm Transmitter Tunings; Tx Iq Tuning (Gsm) - Nokia RM-237 Service Manual

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Ch. 700 / 1842.86771 MHz
Ch. 791 / 1861.06771 MHz
Ch. 870 / 1876.86771 MHz
Ch. 885 / 1879.86771 MHz
Ch. 908 / 1884.46771 MHz
GSM1900
Ch. 496 / 1927.06771 MHz
Ch. 512 / 1930.26771 MHz
Ch. 537 / 1935.26771 MHz
Ch. 586 / 1945.06771 MHz
Ch. 661 / 1960.06771 MHz
Ch. 736 / 1975.06771 MHz
Ch. 794 / 1986.66771 MHz
Ch. 810 / 1989.86771 MHz
Ch. 835 / 1994.86771 MHz
12. If the values are within the limits, click Next to continue to the next band.
Next actions
Repeat the steps 8 to 12 for GSM1800 and GSM1900.

GSM transmitter tunings

Tx IQ tuning (GSM)

Context
The Tx path branches to I and Q signals at RF I/Q modulator. Modulator and analog hardware located after
it cause unequal amplitude and phase disturbance to I and Q signal paths. Tx IQ tuning balances the I and Q
branches.
Tx IQ tuning must be performed for all GSM bands.
Steps
Phoenix service software.
1. Start
2. From the Operating mode drop-down menu, set mode to Local.
3. Choose Tuning→GSM→Tx IQ Tuning .
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RF Troubleshooting and Manual Tuning Guide
Min Typ
-3 0
-3 0
-3 0
-3 0
-6 -1
-6 -1
-3 0
-3 0
-3 0
-3 0
-3 0
-3 0
-3 0
-6 -1
RM-237
Max Unit
3 dB
3 dB
3 dB
3 dB
3 dB
2 dB
2 dB
2 dB
2 dB
2 dB
2 dB
2 dB
2 dB
2 dB
Issue 1