Tx Band Response Calibration (Wcdma) - Nokia MOBILE TERMINAL Service Manual

RM-356
RF troubleshooting
Sweep time:
Detector:
Average:
Trigger:
21. Click Send.
22. Measure the WCDMA output power.
It should be around 21 dBm.
23. Click RF Stop and uncheck the Max power limit check box.
24. Repeat steps 19 to 23 for levels +19, +7, 0, -20 and –40 dBm.
The measured output power may not differ more than +-2 dB from the requested value at level +19 dBm
and no more than +-4 dB on lower levels.
Remember to stop the RF before sending new data.
Alternative steps
• Measure the wide range levels normally and write down the levels that are possible to measure.
• Click Finish.
• Click Options.
• Change the first wide range DAC value to 573 and change the number of tuning steps to 21.
• Change the spectrum analyzer reference level to –20 dBm and adjust the input attenuator to the lowest
value possible.
• In the Wide Range pane, click Tune and fill in the rest of values starting from the 19th level.

Tx band response calibration (WCDMA)

Context
The purpose of this tuning operation is to calibrate the WCDMA Tx performance. It defines the power detector
and Tx frequency compensation values. However, before starting this tuning procedure, it is necessary to
carry out Tx AGC & Power Detector Calibration tuning. This is because its results will be needed for this tuning
operation.
• In the Tuning Settings pane, it is possible to edit the numbers of channels used in this tuning operation.
• If the Calibrate Detector Response check box is checked, only Tx response is calibrated. Zero is written
to the power detector compensation values block in the permanent memory (PM) of the terminal.
• Detector Calibration level shows the power level used for calibrating the power detector in this tuning
procedure.
• Tx Calibration level shows the power level used for calibrating tx frequency in this tuning procedure.
• In the
Measured Power Levels pane, you can insert the dBm values read from the power meter.
• In the
Tuned Values pane, the values that are stored in the permanent memory (PM) of the terminal in
Current columns are shown.
• New values are added to
• The Abort button aborts the tuning operation without saving the tuned values.
• The Read button reads the tuned values in the PM of the terminal, and displays them in the
Values pane in in the Current column.
Issue 1
New column when the Calculate button is clicked.
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20 ms
RMS detector
No
Free run
Tuned
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