Receiver Tunings; Rx Calibration - Nokia RM-57 Service Manual

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Temperature sensor calibration is done in room temperature, in which offset caused by VINKU variation and
AD-converter inside RETU are nullified.
The module is able to do this calibration by itself, no external equipment is needed.
The temperature of the module and components must be 23 +/-2 degrees.
Steps
1. From the dropdown menus, set "Operating mode" to "Local".
2. From the Tuning menu, choose "Temperature Sensor Calibration".
3. Click Tune.
Min
-20
4. A pop-up window appears asking: "Save Values to PM?"; click "Yes"
5. To finish the calibration, click "Close".

Receiver tunings

Rx calibration

Context
Rx Calibration is used to find out the real gain values of the GSM Rx AGC system and tuning response of the AFC
system (AFC D/A init value and AFC slope)
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. From the Tuning menu, choose "Rx Calibration".
4. Check the "Load from Phone" check box and clear the "Save to Phone" checkbox.
5. From the Band dropdown menu, choose GSM900/GSM850.
Page 7–20
Table 14 Temperature sensor calibration tuning limits
Typ
-4
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RF Troubleshooting and Manual Tuning Guide
Max
20
RM-57/58
Unit
0
C
Issue 1