User Guide

RH-37
Service Sofftware and Tuning Instructions Nokia Custome Care
Page 54 Nokia Corporation Issue 1 07/04
RX channel select filter calibration
In the following, the calibration of the Rx channel select filter (BB-filter) inside the FR-
ASIC is described. It is performed by internal measuring of a proto-type filter. For this
reason, the calibration has to be done only once. No RF signal generator is needed. No
GSM band has to be selected in Phoenix.
Rx channel select filter calibration is always the first tuning in the tuning sequence.
Set the operating mode to local mode.
Select Tuning Alt-U
Rx Channel Select Filter
Calibration Alt-H
The setup should now look like this:
Channel Number
(as indicated in the < Rx Band Filter Response Compensation >
window)
Limits
(of < Measured Level
Difference >)
Meas. point GSM900 GSM1800 GSM1900 Low High
First 965 497 497 -6.0 dB +2.0 dB
N1 975 512 512 -3.0 dB +2.0 dB
N2 987 535 537 -3.0 dB +2.0 dB
N3 1009 606 586 -3.0 dB +2.0 dB
N4 37 700 661 -2.0 dB +2.0 dB
N5 90 791 736 -3.0 dB +2.0 dB
N6 114 870 794 -3.0 dB +2.0 dB
N7 124 885 810 -3.0 dB +2.0 dB
Last 136 908 835 -6.0 dB +2.0 dB