Promax TV EXPLORER II Manual De Instrucciones página 167

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USER'S MANUAL. TV EXPLORER II/II+
-6
FREQ:
DL-Ku:
CH:
MPEG-2 TS
Figure 34.- DVB-S (QPSK) signals CBER measurement screen.
In a digital reception system for satellite signals (DVB-S), after the QPSK decoder
two different correction methods are applied (see following Figure). Obviously, each time
we apply an error corrector to a digital signal, the error rate changes, therefore if we
measure in a digital satellite television system, for example, the error rate at the output of
the QPSK demodulator, at the output of the Viterbi decoder, and at the output of the
Reed-Solomon decoder, we obtain nothing more than different error rates. This is the
reason because the BER measurement is provided before FEC, after Viterbi (VBER).
Figure 35.- Digital reception system via satellite. (DVB-S)
-8
FREQ:
DL-Ku:
CH:
MPEG-2 TS
Figure 36.- DVB-S (QPSK) signals VBER measurement screen.
12/2013
-5
-4
-3
1781.94
MHz
C/N:
5037
kHz
POWER:
12382.0
MHz
MER:
99
»
CBER:
VBER:
-7
-6
-5
QEF
1781.94
MHz
C/N:
5037
kHz
POWER:
12382.0
MHz
MER:
99
CBER:
»
VBER:
-2
-1
0.2
dB
51.5
dBµV
10.9
dB
9.7E-4
5.2E-8
-3
0.2
dB
51.5
dBµV
10.9
dB
9.7E-4
5.2E-8
Page 57
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