Promax HD RANGER 2 User Manual page 156

Digital SATELLITE Television FIRST Generation
A1.1.3
(DVB-S standard/QPSK modulation)
DVB-S Parameters
Channel Bandwidth
►
It displays the channel bandwidth from 1.3 MHz to 60.75 MHz.
Spectral inversion
►
It detects if the input signal has been inverted.
Symbol Rate
►
It represents the number of times that the signal status changes in a
period of time. The bandwidth is related to this parameter.
Roll-Off Factor
►
Roll-off factor of Nyquist filter. It indicates the excess of bandwidth over
the ideal bandwidth
Constellation
►
QPSK modulation for constellations with DVB-S signals.
Code rate
►
Also known as Viterbi ratio. It defines the ratio between the number of
data bits and the total number of bits transmitted (the difference
corresponds to the number of control bits for the error detection and
recovery). This value should be between 1/2, 2/3, 3/4, 5/6 and 7/8.
June 2014
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