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Symbol rate option, Fec rate option, Spectrum invert option – TANDBERG E5714 User Manual

Page 158: Roll off factor option

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Operating the Equipment Locally

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.

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