Rx Calibration (Incl. Vcxo Calibration) - Nokia RH-29 Series Manual

RH-29
6b - RF Troubleshooting
The setup should now look like this:
Press Tune and the optimal values are found.
Make sure that Save to Phone is active. It can be activated by clicking with mouse or by
pressing the letter v.
Press Stop and the RX Channel Select Filter Calibration is finished. You can now leave the
tuning by closing the window.

RX calibration (incl. VCXO Calibration)

The "RX calibration" is used to determine gain at different gain-settings for front-end
and Mjoelner and needs to be done in both bands.
RX-calibration requires an external signal generator.
RX-calibration in EGSM900 combines two tunings, VCXO-calibration and AGC-calibra-
tion:
Calibration of GSM1800 band only determines AGC values.
The VCXO-calibration finds out a calibration value for VCXO control, an AFC initial
value and 3 AFC-slope coefficients.
A value (RF_TEMP), which represents the RF hardware temperature, is determined during
RX Calibration. This temperature value is used by DSP to RSSI reporting in Normal mode
Page 14
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Copyright © 2004 Nokia Corporation
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Issue 1 05/2004