9
The Figure 19 "Demodulator settings table"
in modules with DVB-T/T2/C input consists of following parameters: "Modulation
standard" - used to select from the "DVB-T/T2" and "DVB-C" modulation standards. "Preamplifier power" - used to switch
on/off the power for the RF preamplifier. "Input bandwidth" - the bandwidth of DVB-T/T2 transponder. Can be selected from
values 8 MHz and 7 MHz. "Input frequency" – the frequency of the terrestrial or cable transponder in MHz. Frequency step
is 0.1 MHz. When the tuner is locked to the DVB-T2 transponder with multi PLP modulation, the additional parameter "PLP
number" is displayed in the "RF input" table. When the "Modulation standard" is set to DVB-C, the „Preamplifier power"
parameter is disabled and power for the RF preamplifier is switched off; the "Input bandwidth" parameter is disabled and the
"Symbol rate" parameter is enabled. Enter the value in kilo symbols per second.
Figure 19. Demodulator settings table (DVB-T/T2/C input only)
Press „Update“ button to set new parameters.
Input status table
The following information is displayed in the table “Input status”:
“RF level” - RF signal level at the module input. Level indication - approximate.
The values of the following parameters are displayed only if the module has synchronized
with the input signal.
“Modulation standard” - detected standard of the input signal. Possible values of the
standard: DVB-S, DVB-S2, DVB-S2X, DVB-T, DVB-T2, DVB-C
“Frequency” - intermediate frequency (for DVB-S/S2/S2X) or RF frequency (for
DVB-T/T2/C) at the module input.
“Modulation” - modulation scheme of the input signal. Possible values of the modulation
scheme: QPSK, 8PSK, 16APSK, 32APSK (for DVB-S/S2/S2X) QPSK, QAM16, QAM32,
QAM64, QAM128, QAM256 (for DVB-T/T2/C).
“Modulation mode” - OFDM modulation mode of the input signal (for DVB-T/T2/C)
Values: 8k or 2k.
“FEC” - forward error correction.
“Guard interval” - guard interval of OFDM signal (for DVB-T/T2/C).
“Symbol rate” - the symbol rate of the satellite transponder in kilo symbols per second
(tdx420C only).
“SNR” - RF signal/noise ratio at the input of module.
“VBER” - bit error rate after Viterbi corrector. To get the signal without any errors at the
output of the tuner, VBER shall not exceed 2Е-4.
“PER” - ratio of the MPEG2 transport error packets to the whole number of packets.
If the number of error packet is equal to zero, the opposite value to whole number of
packets is displayed. Packet counters are reset during RF input parameters update.
“Input bitrate” - bitrate of the input signal.
Figure 20. Status table (for DVB-S/S2/S2X)
