User Guide

In GSM, the input signal can be either a real GSM signal or a CW (Continuous Wave) signal, which is 67.771

kHz above the carrier frequency.

In WCDMA, the input signal can be either a real WCDMA signal or a CW signal, which is 1 MHz above the carrier

frequency.

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

Related information

• WCDMA Rx chain activation for manual measurement (page 7–13)

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

1. Start

Phoenix

service software.

2. Choose Testing→GSM→RSSI Reading .

3. Set the RF signal generator for a channel frequency +67.771 kHz in CW mode with a –80 dBm signal level.

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.

4. In the

RSSI Reading

window, select the appropriate band and channel.

Figure 59

RSSI Reading

window

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

Results

RSSI reading values of the selected band and channel are displayed. The RSSI level must be the same value

as that which is set at the signal generator (-80 dBm).

RM-100

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Page 7 –12 COMPANY CONFIDENTIAL Issue 2