Rx Band Filter Response Compensation (Gsm) - Nokia n80 User Manual

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Rx band filter response compensation (GSM)

Before you begin
Rx Calibration must be performed before the Rx Band Filter Response Compensation.
Context
On each GSM Rx band, there is a band rejecting filter in front of the LNA (Low Noise Amplifier). In RM-92, the
filter is integrated in RF ASIC N7500, and in RM-91, there is a discreet filter in front of RF ASIC N7505. 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 module jig's GSM connector to the signal generator.
2. From the "Operating mode" dropdown menu, set mode to "Local".
3. Select GSM900 band.
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RF Troubleshooting and Manual Tuning Guide
RM-91; RM-92
Issue 1