Spectrum Analyser - Promax PRODIG-5 Manual Del Usuario

USER'S MANUAL. PRODIG-5
MER represents the relation between the average power of DVB signal and the
average power of noise present in the constellation of the signals.
By example, QAM 64 demodulators require a MER greater than 23 dB to work.
Though it is preferable to have at least a 3 or 4 dB margin to compensate for any
possible degradation of the system. While QAM 256 demodulators require a MER
greater than 28 dB with margins of al least 3 dB. Normally, the maximum MER value
seen in portable analysers is of approximately 34 dB.
Finally it is shown a status line, which displays information about the detected
signal. The possible messages that can appear and its meaning are shown in the
following list. The messages are exposed from less to more fulfilment of the MPEG-2
standard:
No signal received
Any signal has been detected.
Signal received
A signal is detected but it can not be decoded.
Carrier recovered
A digital carrier has been detected but it can not be decoded.
MPEG-2
Correct detection of a MPEG-2 signal.
5.15

Spectrum Analyser

The Spectrum Analyser mode allows the user to discover the signals present in
the frequency band in quickly and easily and to make measurements at the same time.
To select it press
in the next figure.
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[13] key. The monitor will show a picture like the one described
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