Comtech EF Data CDM-710G Installation And Operation Manual page 88

CDM-710G High-Speed Satellite Modem
Front Panel Operation
If Tx Modulation
Tx Spectrum:
Inverted
Select Normal or Invert using the
If Tx Modulation
Tx (α) Rolloff %:
35
The default Rolloff (α) setting is 20%. Whenever the Mode is changed, (α) reverts to 20%, but
(α) can be modified to 25% or 35% from this menu. Select the value using the
then press
ENTER
Tx Modulation Pilot:
Off/On
Select Off/On or Avg/Peak using the
Tx Modulation Pilot:
Off/On
The default value is Off. Select Off to disable insertion of pilot symbols into the physical layer
frame. Select On to enable insertion of pilot symbols into the physical layer frame. Use the
arrow keys to make the selection, then press
Tx Modulation Pilot:
Average
The solid cursor indicates the current configuration choice. The CDM-710G automatically
adjusts, but the default value is Average. Select Average or Peak using the
then press
ENTER
•
Select Average to set the pilots and header to the average power band of the transmitted
constellation (QPSK, 8PSK, 16APSK or 32APSK) per DVB-S2.
•
Select Peak to set the pilots and header to the outer ring of the transmitted constellation
(QPSK, 8PSK, 16APSK or 32ASK).
Not all commercially available demodulators will function well with the Peak
pilot level.
IMPORTANT
Tx Frame Size:
Long Short
The default value is Long. When Long is selected, the standard FECFRAME = 64,800 bits is
enabled. If Short is selected, the 16,200 bit frame is enabled. Select Long or Short using the
arrow keys, then press
Inv is selected:
Normal
(
α is selected:
20 25
(
.
Avg/Peak (
Avg/Peak (
Peak (
.
(
.
ENTER
E)
arrow keys, then press
E)
E)
arrow keys, then press
E)
.
ENTER
E)
E)
6–12
MN-CDM710G
.
ENTER
arrow keys,
.
ENTER
arrow keys,
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