Dvb-S/S2 (Qpsk/8Psk) Digital Channel Configuration - Promax TV EXPLORER HD+ Manual De Instrucciones

Figure 21.- Screen of mesurement configuration (COFDM signals).

5.13.4 DVB-S/S2 (QPSK/8PSK) Digital Channel Configuration

Press the Measurements Configuration
CONFIGURATION menu and turn the rotary selector
Select the signal DVB-S/S2, which uses QPSK/8PSK modulation. Parameters related to
QPSK/8PSK modulation that the user can set are described below:
1) Channel BW (channel bandwidth)
Enables the channel bandwidth to be selected over a range from 1.3 MHz to
60.75 MHz. The selection of this parameter is essential for the correct operation of
the tuner, as it affects the frequency separation of the carriers. If you change the
bandwidth the Symbol Rate changes proportionally and vice versa.
2) Spectral Inv
If necessary, activate the Spectral inversion (On). Reception will be bad if
spectral inversion has been incorrectly selected.
3) Code Rate
Also known as Viterbi ratio. It defines the ratio between the number of data bits
and actual transmission bits (the difference corresponds to the control bits for error
detection and correction).
In DVB-S it permits to choose between 1/2, 2/3, 3/4, 5/6 and 7/8. In DVB-S2 it
permits to choose one of the following values: 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5,
5/6, 8/9 y 9/10.
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[17] key to access to the
[1] until the SIGNAL option.
11/2013