Q-Flex Satellite Modem Installation and Operating Handbook
6-18
If the
BUC LO frequency
has been set on the
Edit->Tx-Rx->BUC/LNB
menu then the L-band transmit frequency will no longer be available and
will be automatically controlled by the modem to achieve the requested
BUC transmit frequency.
Table 6-12 Tx/Rx Carrier Frequency (L-band)
Range:
0.0GHz to 99.999GHz; step size: 0.0000001GHz (i.e. 100Hz)
Description:
This is the BUC frequency used to transmit to satellite.
Table 6-13 BUC Carrier Frequency
Range:
0.0GHz to 99.999GHz; step size: 0.0000001GHz (i.e. 100Hz)
Description:
This is the LNB frequency used to receive from satellite.
If the
LNB LO frequency
has been set on the
Edit->Tx-Rx->BUC/LNB
menu then the L-band receive frequency will no longer be available and
will be automatically controlled by the modem to achieve the requested
LNB receive frequency.
Table 6-14 LNB Carrier Frequency
6.2.4.14 Tx/Rx Spectral Roll-off
The spectral roll-off determines the slope of the carrier at its edges. The supported roll-off
factors are listed in
Table 6-15
.
Range:
5%, 10%, 15%, 20%, 25%, 35%
Description:
All spectral roll-off factors are available for all FECs including DVB-
S2 and DVB-S2X (with the exception of the low-cost version of
DVB-S2, which supports roll-off factors down to and including 15%
roll-off).
A comparison of the different spectral roll-offs, including their effect
on carrier power, is provided in the document ‘
Saving Satellite
Bandwidth by Optimising Spectal Roll-off
’. This is available from
the White Papers section of the Paradise web site at
http://www.paradisedata.com
.
Table 6-15 Tx/Rx Spectral Roll-off