Table of Contents
Advertisement
RM-484; RM-485; RM-486
RF Troubleshooting
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
RSSI measurement . For a similar test in WCDMA mode, see WCDMA RSSI measurement .
GSM RX chain activation for manual measurements/GSM RSSI measurement
Prerequisites
Make the following settings in Phoenix service software:
Setting
Phoenix Channel
Signal generator
to antenna
connector
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.
Issue 1
GSM850
190
37
881.66771MHz
942.46771MHz
(67.71kHz offset)
(67.71kHz offset)
at -60dBm
at -60dBm
Figure 30 Phoenix GSM RSSI reading window
COMPANY CONFIDENTIAL
Copyright © 2009 Nokia. All rights reserved.
GSM RX chain activation for manual measurements/GSM
GSM900
GSM1800
700
1842.86771MHz
(67.71kHz offset)
at -60dBm
GSM1900
661
1960.06771MHz
(67.71kHz offset)
at -60dBm
Page 4 –9
- Quick Links:
- Fmtx 2.1 Schematic
Hide quick links:
Advertisement
Chapters
Table of Contents
Troubleshooting
