User Guide

RX band filter response compensation (GSM)

Before you begin

Rx calibration must be done before the RX Band Filter Response Compensation

Context

In each GSM RX band, there is a band pass filter in front of Helgo 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 module jig’s GSM connector to signal generator.

2. From the dropdown menus, set "Operating mode" to Local, "System mode" to GSM, and Band to GSM900.

3. From the Tuning menu, choose GSM -> Rx Band Filter Response Compensation.

4. Check “Manual” and “Load from Phone” check boxes. Clear “Save to Phone” check box

5. Click Start.

RM-13/33

Nokia Customer Care RF Troubleshooting and Tuning

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