Rx Band Filter Response Compensation; Rx Channel Select Filter (Base Band Filter) - Nokia 2650 Service Manual

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RX Band Filter Response Compensation

This tuning measures the band filters ripple over the bands and the information is used to com-
pensate the RX level reporting.
Note: If you have a signal generator with a frequency list option, please perform Autotuning.
Select Tuning, RX Band Filter Response Compensation
Select Band, for example GSM900
Note: You must first tune the lower band to be able to tune the higer band. You can stop at any
time by switching off the menu. If the values are outside internal specifications, you can not save
them and you will have to leave the tuning without saving.
Select manual tuning and press Start.
You will now be guided through the 9 steps. Each step asks you to set the generator to a certain
frequency and when you press OK, the next step comes up. After every step the value found
is shown in bold.
Figure 7: RX Band Filter Response Compensation stages (example)
When all channels have been tuned you must press Save&Continue. It then continues with the
high band.
The high band tuning goes on like the low band. Every step leads to the next untill all channels
have been tuned.

RX Channel Select Filter (Base Band filter)

The tuning is made internally in the phone by itself. It is the low pass filters in Mjoelner that is
calibrated/tuned. Only result is OK or Not OK.
Issue 2 06/2005 COMPANY CONFIDENTIAL
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