User Guide

Nokia Customer Care

Appendix A: RF Troubleshooting

A-16

Company Confidential

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to R7531.

• WTXDET signal should be constant DC-voltage. Voltage level should change if TX power is changed.

Vcontrol is lower on lower power levels and higher if higher power levels are used.

• WTXDET should be about 325 mV with power level +10 dBm, about 1.03 V with power level

+21 dBm and about 150 mV when power levels below 0 dBm are used.

• NOTICE: Perform WCDMA transmitter tests with > 0 dBm power only in RF shielded environment.

• If WTXDET –signal is not as expected follow the same troubleshooting instructions as in:

Does

SMPS get correct control voltage from the WCDMA power detector (signal Vcontrol)?