User Guide

Table Of Contents

Transmitter troubleshooting

Introduction to transmitter (TX) troubleshooting

Please note the following before performing transmitter tests:

• TX troubleshooting requires TX operation.

• Do not transmit on frequencies that are in use!

• The transmitter can be controlled in local mode for diagnostic purposes.

• The most useful Phoenix tool for GSM transmitter testing is “RF Controls”.

• Remember that re-tuning is not a fix! Phones are tuned correctly in production

Note: Never activate the GSM transmitter without a proper antenna load. Always connect a 50 Ω

load to the RF connector (antenna, RF-measurement equipment or at least a 2 W dummy load);

otherwise the GSM Power amplifier (PA) may be damaged.

GSM transmitter troubleshooting

Prerequisites

Always start troubleshooting the lowest band, e.g. GSM850.

Steps

1. Set the phone to local mode.

2. Activate RF controls in Phoenix (Testing→GSM→Rf Controls ).

Set RF controls as shown in the figure below. GSM900 is used for this example.

RM-429

RF troubleshooting

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