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 section GSM RX chain activation for manual measurements/
GSM RSSI measurement (page 4–11) . For a similar test in WCDMA mode, see section WCDMA RSSI
measurement (page 4–14).
The RX path for GSM and WCDMA are using the same filters in some bands. Please refer to RF component
reference (page 4–27) for details.
GSM RX chain activation for manual measurements/GSM RSSI measurement
Prerequisites
Make the following settings in signal generator and Phoenix service software:
Setting GSM850 GSM900 GSM1800 GSM1900
Phoenix Channel 190 37 700 661
Signal generator
to antenna
connector
881.46771MHz
(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 by selecting Testing→GSM→RSSI reading .
Figure 16 Phoenix RSSI Reading window
Results
The reading should reflect the level of the signal generator (minus losses) ±5dB.
When varying the level in the range -30 to -102dBm the reading should then follow within ±5dB.
RM-598; RM-604
RF Troubleshooting
Issue 1 COMPANY CONFIDENTIAL Page 4 –11
Copyright © 2009 Nokia. All rights reserved.
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