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RSSI Reading window, select the appropriate band and channel.
4. In the
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 (-90 dBm).
Transmitter troubleshooting
General instructions for TX troubleshooting
Context
• Tx troubleshooting requires Tx operation.
• Do not transmit on frequencies that are in use!
• Transmitter can be controlled in the local mode for diagnostic purposes.
• The most useful Phoenix tool for GSM transmitter testing is "RF Controls".
• Tx IQ tuning and Tx power tuning can be also used in some cases.
• Remember that retuning is not a fix! Phones are tuned correctly in production.
The first set of steps instructs how to assemble the test setup. This setup is general for all Tx troubleshooting
tasks.
Alternative steps provide specific troubleshooting instructions for
Caution:
Never activate the GSM transmitter without a proper antenna load. There should be always
50 Ω load connected to the RF connector (antenna, RF-measurement equipment or at least 2 W
dummy load), otherwise the GSM Power amplifier may be damaged.
Steps
1. Connect a test jig to a computer with FPS-10 flash prommer with a USB cable.
Make sure that you have a PKD-1 dongle connected to the computer's parallel port.
2. Connect test jig with DC supply voltage set to 4V.
Page 4 –14
RSSI Reading window
Figure 21
COMPANY CONFIDENTIAL
Copyright © 2007 Nokia. All rights reserved.
RF Troubleshooting and Manual Tuning Guide
Phoenix service software.
RM-164
Issue 1
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