Gsm Rx Chain Activation For Manual Measurements / Gsm Rssi Measurement - Nokia RM-164 Service Manual

RM-164
RF Troubleshooting and Manual Tuning Guide

GSM Rx chain activation for manual measurements / GSM RSSI measurement

Context
RSSI signal measurement is the main Rx troubleshooting measurement. The test measures the strength of
the received signal.
I and Q branches can be measured separately. In GSM, the input signal can be either a real GSM signal or a
CW (Continuous Wave) signal that is 67.771 kHz above the carrier frequency.
Steps
Phoenix service software.
1. Start
2. Choose Testing→GSM→RSSI Reading .
3. Set the RF signal generator for a channel frequency +67.771 kHz in CW mode.
Alternatively set the cellular tester downlink channel to the appropriate channel. Make sure that the tester
is set to continuous mode, not to burst mode.
Issue 1
Figure 20 Rx IQ test points
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