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NewS
tream
User Guide and Technical Manual
Modify Presets Modulation Settings
[Continued]
Bandwidth
The 6, 7 and 8 MHz bandwidths are used for DVB-T and that 10 and 20 MHz are used
for LMS-T.
• 6
MHz
• 7
MHz
• 8
MHz
• 10
MHz
• 20
MHz
Symbol Rate
Symbol Rate [aka baud or modulation rate] is the number of symbol changes [i.e.
waveform changes or signalling events] made to the transmission medium per second
using a digitally modulated signal or a line code. The Symbol Rate is expressed in
Mega symbols/second [Ms/s]. The valid range is 1.0000-36.0000 Ms/s.
Roll Off
Roll-off describes the steepness of a transmission function with frequency, in
connection with
fi
lter circuits in the transition between a passband and a stop band.
Values of Roll-off are expressed in percentages, ranging from:
• 35%
• 25%
DVB-S2 Options
DVB-S2 Modulation
The DVB-S2 Modulation drop-down menu includes the following options:
• QPSK 1/4, QPSK 1/3, QPSK 2/5, QPSK 1/2, QPSK 3/5, QPSK 2/3,
• QPSK 3/4, QPSK 4/5, QPSK 5/6, QPSK 8/9, QPSK 9/10.
• 8PSK 3/5, 8PSK 2/3, 8PSK 3/4, 8PSK 5/6, 8PSK 8/9, 8PSK 9/10.
• 16PSK 2/3, 16PSK 3/4, 16PSK 4/5, 16PSK 5/6, 16PSK 8/9, 16PSK 9/10.
• 32APSK 3/4, 32APSK 4/5, 32APSK 5/6, 32APSK 8/9, 32APSK 9/10.
Pilot
To assist carrier recovery, DVB-S2 can insert special “pilot symbols” at the physical
layer. The Pilot option can be enabled with the selection of On, depending on satellite
requirements.
,
Frame Size
The following Frame Size options are available, depending on satellite requirements:
• Normal
• Short
Apply
The
Apply
button activates the Modulation Settings that you have con
fi
gured for the
NewS
tream
IDU.
