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TV EXPLORER HD / HD
USER'S MANUAL.
Figure 38.- DVB-S2
BER
The
measurement is provided in scientific notation (i.e. 2.7 E-7 means
2.7x10
-7
, that is to say two incorrect bits of every 1,000) and through an analogue bar (as
its length is smaller the signal quality will be better). The analogue representation is done
on a logarithmic scale (not linear).
With the aim to have a reference about the signal quality, it is considered that a
system has a good quality when it decodes less than one non-correctable error for every
transmission hour. This border is known as
BER
approximately to a
the measurement bar of the
left
must be at the
side of this mark.
Next it is shown the tuning frequency and the frequency deviation in MHz between
the tuned frequency and the one, which optimizes the
Finally it is shown a status line with 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
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.
Viterbi synchronized
A digital carrier has been detected and the Viterbi algorithm is synchronized, but
too many frames arrive with non correctable errors. It is not possible to quantify the
BER.
MPEG-2 TS DVB-S
Correct detection of a MPEG-2 signal.
10/2012
LE
QPSK/8PSK
(
) signals
QEF
2.0E-4 BER
after Viterbi of
BER
after Viterbi and therefore,
LBER
measurement screen.
Quasi-Error-Free
(
) and it corresponds
(2.0x10
-4
). This value is marked on
BER
for acceptable signals
BER
.
MPEG-2
standard:
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