Operating the Equipment Locally: Output Menu - Descriptor Type = Satellite
Reference Guide: Voyager E5784 and E5788 HD DSNG Encoder
Page 4-107
ST.RE.E10137.3
Symbol Rate Option
Access the Symbol Rate option from the
Satellite Modulator Menu
.
Table 4.132: Symbol Rate Options
Valid Input Range
Description
Min (Low Sym Rate):
Min:
Max:
Step Size:
0.3000 Msym/s
1.0000 Msym/s
30.0000 Msym/s
0.0001 Msym/s
Minimum with low symbol rate option M2/ES02/LSYM.
Changing the symbol rate affects the automatic Tx bandwidth, video
bit-rate and video resolution calculations.
FEC Rate Option
Access the FEC Rate option from the
Satellite Modulator Menu
.
Table 4.133: FEC Rate Options
Selected Option
Description
1/2
Satellite Modulator uses FEC rate of 1/2.
2/3
Satellite Modulator uses FEC rate of 2/3.
3/4
Satellite Modulator uses FEC rate of 3/4.
5/6
Satellite Modulator uses FEC rate of 5/6.
7/8
Satellite Modulator uses FEC rate of 7/8.
8/9
Satellite Modulator uses FEC rate of 8/9.
NOTE…
Only certain combinations of Modulation Type and FEC Rate are valid.
Spectrum Sense Option
Access the Spectrum Invert option from the Satellite Modulator Menu. This
allows the spectrum sense to be normal or inverted.
Roll Off Factor Option
The Roll Off Factor option is to do with the bandwidth of the modulated
output and how quickly the output level rolls off with frequency. There are
two values, 25% and 35%. Only 35% is allowed for QPSK but both 25%
and 35% are available in 8PSK and 16QAM.
In the L-band option, only 35% is allowed for QPSK and BPSK.
Tx Bandwidth Factor Option
Access the Tx Bandwidth Factor option from the
Satellite Modulator
Menu
. This option is used to calculate the Tx Bandwidth based upon the
Symbol Rate.
Bandwidth = Factor x Symbol Rate