User Guide

NPL-4/5
Nokia Customer Care
Page 48 Copyright © 2004 Nokia Corporation. All rights reserved. Issue 1 05/04
- Connect the RF signal generator to the antenna port of the test jig respectively the
phone.
- Compensate for external RF cable and test jig losses.
- Press “OK”.
- Press “Save and continue” to tune GSM1800 and GSM1900.
Limits
The typical value of the “Measured Level Difference (dB)” on channel 37 (middle of band)
shall be approximately 0 dB.
Figure 12: Measured Level Differencer
Rx band filter response GSM 900, GSM 1800 and GSM 1900
The Rx Band Filter Response Calibration is identical for the other GSM 900, GSM 1800,
GSM 1900 bands. So the instructions of chapter Rx Band Filter Response GSM850 can
be applied correspondingly. Frequency and channel designations vary correspondingly to
the band selected according to the displayed windows in Phoenix.
The limits are valid for all GSM bands.
RX channel select filter calibration
In the following the calibration of the Rx Channel Select Filter (BB-filter) inside the RF-
ASIC is described. It is performed by internal measuring of a proto-type filter. For this
reason the calibration has to be done only once. No RF signal generator is needed.