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Symbol Rate
The number of symbols transmitted per second.
The amount of data per symbol is dependant
upon the modulation type, e.g. QPSK, 8PSK, etc.
Acquisition
Acquisition Range is defined as the range of
Range
frequencies that the tuner will scan in order to
achieve carrier synchronization. Allows the
operator to select the range of frequencies that
the RF tuner will sweep through to acquire the
carrier. e.g. If the desired carrier is at 1.080GHz
and the Acquisition Range is set to 5MHz, the RF
tuner will sweep through 1.080GHz ± 2.5MHz to
acquire the carrier. Units are in MHz.
A ctual acquisition range available is
note:
symbol rate dependent for advanced and
premium demods. If symbol rate <
5MBaud, maximum range is 1.5 * symbol
rate. If symbol rate > 5Mbaud, maximum
range is 7.5MHz.
Rolloff
The rolloff selection will determine the shape of
the input filter. The occupied bandwidth of the
modulated signal is the symbol rate multiplied by
(1+α) where alpha (α) is the rolloff factor (%).
By using a lower alpha, carriers can be spaced
closer together on a given transponder or an
increased symbol rate can be realized for a given
bandwidth.
note: 5%, 10%, and 15% rolloff is only
applicable in DVB-S2 with premium
QPSK-1/2
8PSK-5/6
QPSK-2/3
8PSK-8/9
QPSK-3/4
8PSK-9/10
QPSK-5/6
8PSK_AUTO*
QPSK-6/7
16QAM-3/4
QPSK-7/8
16QAM-7/8
QPSK-1/4
16APSK-2/3
QPSK-1/3
16APSK-3/4
QPSK-2/5
16APSK-4/5
QPSK-3/5
16APSK-5/6
QPSK-4/5
16APSK-8/9
QPSK-8/9
16APSK-9/10
QPSK-9/10
32APSK-3/4
QPSK_AUTO*
32APSK-4/5
8PSK-3/5
32APSK-5/6
8PSK-2/3
32APSK-8/9
8PSK-3/4
32APSK-9/10
Range can be determined by
feature key.
0 - 7.5MHz
5%
10%
15%
20%
25%
35%
AUTO*
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