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RM-57/58
RF Troubleshooting and Manual Tuning Guide
Changed component
Any component in the GSM TX RF chain before the PA
Any component in the GSM TX RF chain after the PA
or PA
Any component in the GSM RX chain
VCTCXO (G7501)
RF channel filter calibration
Context
Rx channel filter calibration tunes Rx and Tx ASICs' internal low pass filters that limit the bandwidth of BB IQ
signals.
Tx filter
Rx filter
Steps
1. From the dropdown menus, set "System mode" to "Local".
2. From the Tuning menu, choose RF Channel Filter Calibration.
3. Click Tune.
4. Click Write.
Saves tuned values to the PMM area.
5. To close the tuning window, click Close.
Results
Temperature sensor calibration
Context
There is a temperature sensor integrated into VINKU ASIC. VINKU provides DC-voltage, which is temperature
dependent.
Issue 1
Table 13 RF channel filter calibration tuning limits
Min
0
0
Figure 69 RF channel filter calibration typical values
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Perform following tunings
Tx IQ Tuning, Tx Power Level Tuning
Tx Power Level Tuning
Rx Calibration, RX Band Filter Response
Compensation, RX AM Suppression
Rx Calibration (GSM850 band)
Typ
5
11
Nokia Customer Care
Max
31
31
Page 7–19
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