15.1.1999
3GP_60GB
8
Product: TGP-60-EU (Vega) / Local Service Mode
4.4.3.1 Tuning
Connect the GSM tester to the phone and select item "Tuning-TX power" from the
menu. First adjust the minimum power level to the specified value and then the max-
imum power level.
Now two pairs of power control/output power values are known. From this informa-
tion, the tuning software is able to create an approximation for the power control/out-
put power curve of this particular unit and solve the power control value for each of
the remaining nine power levels.
You can adjust the template to match by moving the corner positions and minimum
spectrum by adjusting the rise/fall speed. Usually, the default values for the corner
positions and speed should be correct. However, you should check the spectrum
due switching on the two highest power levels and the power template on the two
smallest power levels, especially the rising edge position. If any of these fail, you
should check all levels.
4.4.4 RX RSSI
A GSM mobile must be able to report the correct receiver input signal level (RXL)
and quality (RXQ) to the base station. The reported RX level is calculated from the
RF gain control value in the AGC circuit and I/Q demodulator input level, and cor-
rected with calibration values individual to each phone.
4.4.4.1 Tuning
Connect the GSM tester or RF signal generator to the phone and select item "Tun-
ing-RX RSSI" from the menu. Adjust the generator according to the software direc-
tions.
The RX level measurement is performed and the difference between measured and
actual value is calculated.
Measurement is repeated using different signal levels. After all measurements are
completed, the calibration table is calculated and stored on EEPROM.
4.4.5 A/D converter calibration
Remove the battery and connect a multimeter to the battery connector pins behind
the phone. Adjust the external power supply voltage until the voltage of the battery
pins is 5.0 +/- 0.01 volts.
The phone should be at room temperature (25 +/-5 degrees Celsius) for correct tem-
perature calibration.
Select item "Tuning-A/D converter" from the menu. The input values of the battery
voltage and temperature measurement channels are read and stored on EEPROM.
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