User Guide

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:

Band Attenuation

GSM850 0.2 dB

GSM900 0.2 dB

GSM1800 0.3 dB

GSM1900 0.3 dB

RF autotuning

Prerequisites

For information on the recommended test set-up, refer to the corresponding information on PWS/NOL.

Before you can use the auto-tune feature, the GPIB driver from the GPIB card vendor must be installed and

running.

The autotune .ini file must be in a correct place: C:\Program Files\Nokia\Phoenix\products\xx-x*

\autotune_xx-x*.ini (

*= indicates the type designator of the phone, e.g. RM-1

)

Context

RF autotuning is performed with the aid of Digital Radio Communication Tester. Autotuning covers all RF

tunings that are needed to perform after RF component repairs.

Note: Do not perform RF autotuning without a proper reason. Phones are tuned in production and

an RF tuning may be performed only after component repairs or if the RF tuning information is lost.

Steps

1. Connect the communication tester to the GPIB bus.

2. Start Phoenix service software.

3. From the Tools menu, choose Options -> GPIB Card.

4. In the Card Type line, select CEC8Bit, then click Start.

After clicking Start, the name of the communication tester appears in the list of found Listeners.

RM-198

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Page 7 –20 COMPANY CONFIDENTIAL Issue 1