Dvb-S/S2 And Dss Signals - Promax US TV EXPLORER 2 User Manual

-8
FREQ:
CH:
MPEG-2
Figure 34.- Screen of SER measurement (8-VSB signals).
Finally it is shown a status line with information about the detected signal. The
possible messages that can appear and its meaning are showing the following list. The
messages are exposed from less to more fulfilment of the MPEG-2 standard:
No signal received
No signal has been detected.
Timing recovered
Only it is possible to recuperate the symbol time.
AFC in lock
The system automatic frequency control can identify and lock a digital
transmission (TDT) but its parameters can not be obtained. It can be due to a
transitory situation previous to the TPS identification (Transmission Parameter
Signalling) or well to a TDT transmission with an insufficient C/N ratio.
TPS in lock
The TPS (Transmission Parameter Signalling) are decoded. The TPS are carriers
containing information related to the transmission, modulation and codification:
Modulation type, Viterbi Code Rate, and Number of the received frame.
MPEG-2
Correct detection of a MPEG-2 signal.
5.14.7.3

DVB-S/S2 and DSS signals

Once determined the parameters of QPSK signal, it will be possible to measure
BER. Following is shown the BER measurement before the error corrections: BER
before the FEC: CBER.
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USER'S MANUAL. US TV EXPLORER II
ERR.SEG/s >3
-6 TOV -2
57.00 MHz C/N: >21.3
-3 kHz POWER: 55.8
A02 MER: 19.5
» SER: 1.0E-5
VBER: 1.0E-8
0
dB
dBµV
dB
10/2007