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Page 4-80 Instruction Manual: evolution 5000 E57xx DSNG and DENG Voyager Encoder
ST.TM.E10076.3
Symbol Rate Option
To access the Symbol Rate option, press the Symbol Rate softkey in the
Satellite Modulator Menu.
Table 4.93: Symbol Rate Options
Valid Input Range Description
1U
Min:
Max:
Step Size:
0.4688 Msym/s
30.0000 Msym/s
0.0001 Msym/s
When the IF frequency is 60 MHz to 80 MHz the maximum symbol rate
is 30 Msym/s.
When the IF frequency is 50 MHz or 90 MHz the maximum symbol rate
is 20 Msym/s.
2U
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
To access the FEC Rate option, press the FEC Rate softkey in the
Satellite Modulator Menu.
Table 4.94: 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 Invert Option
To access the Spectrum Invert option, press the Spectrum Invert softkey
in the Satellite Modulator Menu. This allows the spectrum inversion to
be turned On or Off.
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.