4RF Aprisa XE, Руководство пользователя

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In-service commissioning | 173
Checking the link performance
For a graphical indication of the link performance, you can use the constellation analyzer.
The 'dots' are a graphical indication of the quality of the demodulated signal. Small dots that are close
together indicate a good signal. If the dots become spaced further apart, this indicates that the signal
quality is degrading. This signal quality degradation can be caused by low Rx signal level due to, for
example:
ƒ external interference
ƒ failure of any of the following: modem, receiver, far end transmitter, an antenna (either end), a
feeder or connector (for example, due to water damage)
ƒ path issues such as multi-path fading or obstructions
To check the performance of the link using the constellation analyzer:
1.
Select Link or Local or Remote > Performance > Constellation.
A blank constellation diagram appears:
2.
Click Start to start the constellation analyzer.
While the constellation analyzer is running, the terminal will temporarily stop collecting error
performance statistics. If you want to run the constellation analyzer anyway, click OK when you
see this warning message:
3.
Click Stop to stop the constellation analyzer.
The terminal automatically resumes collecting error performance statistics.