Cable And Adapter Losses; Rf Autotuning - Nokia N72 Service Manual

RM-180
RF Troubleshooting and Tuning Guide
Important:
in rare cases.

Cable and adapter losses

RF cables and adapters have some losses. They have to be taken in account when the phone is tuned. As all
the RF losses are frequency dependent, the user have to be very careful and understand the measurement
setup. For more detailed information, see section Service Tools and Service Concepts.
Cable and adapter losses
RF cables and adapters have some losses. They have to be taken in account when the phone is tuned. As all
the RF losses are frequency dependent, the user have to be very careful and understand the measurement
setup. In the following table there are RF attenuations of the module jig:
GSM850/GSM900
GSM1800
GSM1900

RF autotuning

Prerequisites
For information on the recommended test set-up, refer to the corresponding information on the Partner
Website or Nokia Online.
Before you can use autotuning, the GPIB driver from the GPIB card vendor must be installed and running.
The autotune .xml file must be in a correct place: C:\Program Files\Nokia\Phoenix\products\xx-xx*
*= indicates the type designator of the phone. )
\rfconf_xx-x*.xml (
Context
RF autotuning is performed with the aid of a digital radio communication tester (CMU200). Autotuning covers
all RF tunings that are needed to perform after RF component repairs.
Note: Do not perform RF autotuning without a proper reason. RF tuning may only be performed
after component repairs or if the RF tuning information is lost.
Steps
1. Connect the communication tester to the GPIB bus.
Phoenix service software.
2. Start
3. Choose Tools→Options→GPIB Card .
4. From the Card Type drop-down menu, choose the GPIB card used, and click Start.
The name of the communication tester appears in the
Issue 1
After RF component changes, always use autotuning. Manual tunings are only required
Band
COMPANY CONFIDENTIAL
Copyright © 2006 Nokia. All rights reserved.
Attenuation
0.2 dB
0.3 dB
0.3 dB
Listeners pane.
Nokia Customer Care
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