I/Q Tuning - Nokia 2650 Service Manual

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Set the spectrum analyser or GSM tester for the required settings and press "OK" . If a GSM
tester is used, set the TX data type to random so that the tester can trig on the signal.
Figure 56:TX tuning
Tune the highlighted values to the wanted power (Use average burst power).
Tune the base level to –25dBm.
When done press Save&Continue. The intermediate results are then calculated.
The procedure has to be followed. First low band tuning and then high band tuning. You do not
need to change anything.

I/Q tuning

Select Tuning, Tx IQ tuning, TX Data Type "random" for a GSM tester like CMU200 or 1/0 for
SPA measuring.
CMD55 shows the same as a spectrum analyzer when I/Q tuning is selected. CMU200 shows
the carrier and sideband supression directly as figures in the modulation mode.
64 COMPANY CONFIDENTIAL Issue 2 06/2005
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