User Guide

Table Of Contents

Receiver troubleshooting

Introduction to receiver (RX) troubleshooting

RX can be tested by making a phone call or in local mode. For the local mode testing, use Phoenix service

software.

The main RX troubleshooting measurement is RSSI reading. This test measures the signal strength of the

received signal. For GSM RSSI measurements, see GSM RX chain activation for manual measurements/GSM

RSSI measurement (page 4–11).

GSM RX chain activation for manual measurements/GSM RSSI measurement

Prerequisites

Make the following settings in Phoenix service software:

Setting GSM850 GSM900 GSM1800 GSM1900

Phoenix Channel 190 37 700 661

Signal generator

to antenna

connector

881.66771MHz

(67.71KHz offset)

at -60dBm

942.46771MHz

(67.71kHz offset)

at -60dBm

1842.86771MHz

(67.71kHz offset)

at -60dBm

1960.06771MHz

(67.71kHz offset)

at -60dBm

Steps

1. Set the phone to local mode.

2. Activate RSSI reading in Phoenix (Testing→GSM→RSSI reading )

Results

The reading should reflect the level of the signal generator (-losses) +/- 5 dB.

When varying the level in the range -30 to -102 dBm the reading should then follow within +/-5 dB.

RM-429

RF troubleshooting

Issue 1 COMPANY CONFIDENTIAL Page 4 –11