be corrected using the RS error correction scheme.
Signal monitoring
The RF-T/H tab also provides useful information on signal quality.
The
Signal Level
is expressed in dB
µ
V and is graphically represented as a gauge
for immediate visualization.
SNR
(Signal to Noise Ratio) is an indicator of the signal quality. It performs a
simple comparison between the total noise strength on the signal monitored and
the signal power. It is expressed in dB.
Some of the information relating to signal quality cannot be obtained
simultaneously with MPEG2-TS processing. To obtain information on Constellation,
MER and EVM, it is necessary to specify you want to view that information through
the “Further RF measurments” check box.
NOTE
: Checking this box will have the impact of disabling the MPEG2-TS. That
means
all information relating to MPEG2-TS will no longer be available
.
ETR290 and associated PCR jitter, Alarms, recording and decoding of the stream,
DVB-H analysis, ESG decoding will be disabled.
The
Constellation
is displayed as soon as the signal is tuned. This screen
provides instant graphical representation of the signal quality. If signal is degraded,
constellation points become unclear.
MER
(Modulation Error Ratio) is also an indicator of the OFDM signal quality.
MER is expressed in dB and is a representation of the distance between
constellation points actually measured and theoretical constellation points. It is an
indicator of noise, interferences or distortions on the signal.
EVM
(Error Vector Magnitude) measures the vector magnitude between the
constellation point actually measured and the theoretical constellation point. It is an
indicator of interferences or distortions on the signal. This value is expressed as a
percentage.
NOTE
: All the parameters measurements are also displayed in the form of
graphs via the Monitoring display for a time-based evolution view. To obtain
minimum, maximum and last values measured since signal lock or last reset on a
specific parameter, place your mouse over the legend square at the bottom left. The
measure selected is highlighted. To toggle viewing/hiding of a parameter
monitoring, click the corresponding colored square.
ENENSYS DiviCatch RF - Manual
Page 26 / 40
Divi
Catch RF
User Guide