DekTec DTC-300 StreamXpress - Manual (Page 28)

DTC-300-SP – StreamXpress
USER MANUAL
28
Variable Type Description Details Diag
Modulation
Modes
Drop
down
Select if the modulator is using 8-VSB or 16-VSB #1 1
Sideband
Filters
Drop
down
Select the number of taps for the sideband filter #2 2
#1 Modulation Modes:
There are 2 modes defined by the ATSC standard 8 and 16-VSB. 16VSB was notably intended to be
used for ATSC digital cable, but QAM has been chosen as the cable industry standard instead. 8VSB
should be used as default.
#2 Sideband Filter:
These setting allow choosing the number of taps for the sideband filters. Changing the sideband
filters changes the shape of the RF envelope. The default value is 32 taps. Note that settings above
32 should be avoided as it will cost an excessive amount of CPU cycles to the PC with no real gain
in the modulation.
3.5.4 CMMB Modulation settings
If the DekTec Adaptor is licensed to support the CMMB modulation, the user can select the CMMB
modulation and change its parameters.
NOTE: The CMMB modulation does not accept direct transport streams. It requires the use of the
CMMB multiplexed file.
NOTE: The CMMB modulation is used both in the Satellite band and the UHF/VHF band. DekTec
StreamXpress only support CMMB in the UHF/VHF band.
Variable Type Description Details Diag
Channel
Bandwidth
Drop
down
Select the modulator bandwidth between 2Mhz and 8Mhz #1 1
TxID Field Select a number for Transmitter Identity (128-256) #2 2
Area ID Field Select a number for Area Identity (0-127) #3 3
1
2