Promax TV EXPLORER II Manual De Instrucciones página 167

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