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
. 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 and in the signal generator:
Setting GSM850 GSM900 GSM1800 GSM1900
Phoenix Channel 190 37 700 661
Signal generator
to antenna
connector
881.66771 MHz
(67.71kHz offset)
at -60dBm
942.46771 MHz
(67.71kHz offset)
at -60dBm
1842.86771 MHz
(67.71kHz offset)
at -60dBm
1960.046771 MHz
(67.71kHz offset)
at -60dBm
Steps
1. Set the phone to local mode.
2. Activate RSSI reading in Phoenix (Testing→GSM→RSSI reading )
Results
With the
Measuring mode
set to
Sum vector
, 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.
Now select the measuring mode to
Q branch
and
I Branch
. In each case the reading should be 3 dB below
the signal generator level.
RM-240
RF troubleshooting
Page 4 –12 COMPANY CONFIDENTIAL Issue 1
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