User Guide

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

received signal. I and Q branches can be measured separately. For GSM RSSI measurement, see GSM Rx chain

activation for manual measurements / GSM RSSI measurement (Page 7–10), and for the same measurement

in WCDMA, see WCDMA RSSI measurement (Page 7–12).

In GSM, the input signal can be either a real GSM signal or a CW signal that is 67.771kHz up from the carrier

frequency.

For service tool usage instructions, refer to section Service Tools and Service Concepts.

See Also

• WCDMA Rx chain activation for manual measurement (Page 7–11)

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 real GSM signal or CW signal

that is 67.771kHz up from the carrier frequency.

Steps

1. Start Phoenix service software.

2. From the Testing menu, choose GSM and RSSI Reading.

3. Setup RF signal generator for channel frequency +67.771kHz CW mode with –80dBm signal.

Alternatively set cellular tester downlink channel to an appropriate channel.

4. In the RSSI Reading window, select the appropriate band and channel.

Figure 67 RSSI Reading window

5. To start measurement/activate GSM Rx chain, click the Start button.

Results

RSSI reading values of the selected band and channel are displayed.

RM-1

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Page 7–10 Company Confidential Issue 1