Rx Band Filter Response Compensation (Gsm) - Nokia n81 Service Manual

RM-179; RM-223
RF troubleshooting
9. Click Next to continue with GSM1800 Rx tuning.
Next actions
Repeat steps 6 to 9for GSM1800 and GSM1900

Rx band filter response compensation (GSM)

Prerequisites
Rx calibration must be performed before the Rx band filter response compensation.
Context
On each GSM Rx band, there is a band filter in front of the RF ASIC front end. The amplitude ripple caused by
these filters causes ripple to the RSSI measurement, and therefore calibration is needed.
The calibration has to be repeated for each GSM band.
Steps
1. Connect the GSM connector of the module jig to a signal generator.
Phoenix service software.
2. Start
3. From the Operating mode drop-down menu, set mode to Local.
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