Nokia 6680 RM-36 Service Manual page 235

RM-36
RF Troubleshooting and Manual Tuning Guide Nokia Customer Care
Rx band response calibration (WCDMA)
Context
There is a band rejecting filter for each WCDMA Rx band between the front end LNA and the mixer of HINKU. The
amplitude ripple caused by this filter causes ripple to the RSSI measurement and therefore Rx band response
calibration is needed.
Rx band response calibration can be done in two different ways. If the signal generator in use supports frequency
sweep table, the calibration can be done as a part of Rx calibration. If not, it is possible to calibrate all the
necessary frequencies one by one.
The first set of steps shows how to perform the calibration without the signal generator sweep feature and the
alternative steps give instructions how to perform the calibration if the signal generator supports frequency
sweeps and the calibration can be performed within Rx AGC calibration.
Steps
1. From the "Operating mode" dropdown menu, set mode to "Local".
2. From the Tuning menu choose WCDMA -> Rx Band Response Calibration.
3. Click Start and Tune.
4. Setup the signal generator to correspond the values in the pop-up window:
Issue 1 Company Confidential Page 7–47
Copyright ©2005 Nokia. All Rights Reserved.