Nokia RM-42 Service Manual

Also see for RM-42: Service manual

Contents

4. Setup the signal generator to correspond the values in the "RX AGC Calibration" pop-up window and click OK:Frequency: 2141MHzLevel: –51 dBm + cable and adapter attenuationsModulation: FMDeviation: 500 kHzModulation frequency: 50 kHz5. Check that the “Rx Chain” value in “Tuning Results” is within the limits presented in the table below.Min Typ Max UnitRX chain -6 1.5 3.5 6 dBLow freq -5 -0.7 4.0 5High freq -5 -0.7 4.0 56. If the Rx gain is acceptable, click Yes to save the results to the phone.7. To close the tuning window, click Close.Rx band response calibration (WCDMA)ContextThere is a band rejecting filter for each WCDMA Rx band between the front end LNA and the mixer of HINKU. Theamplitude ripple caused by this filter causes ripple to the RSSI measurement and therefore Rx band responsecalibration is needed.Rx band response calibration can be done in two different ways. If the signal generator in use supports frequencysweep table, the calibration can be done as a part of Rx calibration. If not, it is possible to calibrate all thenecessary frequencies one by one.The first set of steps shows how to perform the calibration without the signal generator sweep feature and thealternative steps give instructions how to perform the calibration if the signal generator supports frequencysweeps and the calibration can be performed within Rx AGC calibration.Steps1. From the "Operating mode" dropdown menu, set mode to "Local".RM-42RF Troubleshooting and Manual Tuning Guide Nokia Customer Care9241872 (Issue 1) Company Confidential Page 7–45Copyright ©2005 Nokia. All Rights Reserved.