DekTec DTC-300 StreamXpress User Manual
Page 35
DTC-300-SP – StreamXpress
USER MANUAL
35
Variable
Type
Description
Details Diag
Bandwidth
Selection
Drop
down
Select the bandwidth of the modulated channel
#1
1
Modulation
modes
Drop
down
Allow to set the number of active carriers
#2
2
Constellation
Mode
Drop
down
Select the Constellation mode used for the modulation
#3
3
Guard
interval
Drop
down
Select the guard interval used for the modulation
#4
4
Code Rate
Drop
down
Select the FEC code rate used for the modulation
#5
5
More
Button
Open a second window with more settings (See section below)
#6
6
#1 Bandwidth Selection:
The DVB-T modulation supports multiple bandwidth per channel. With this setting the user can select
between 5,6,7,8 MHz for the RF spectrum per channel.
#2 Modulation modes:
The DVB-T modulation supports 3 modes. 2K, 4K and 8K. These modes represent the approximate
number of active carriers. The exact number of carriers is for DVB-T:
1705 active carrier for 2K mode
3409 active carrier for 4K mode
6817 active carrier for 8K mode
#3 Constellation Modes:
The DVB-T modulation supports multiple sub-modulation modes. Depending on the application and
how error prone the channel is the user can select different constellation modes. StreamXpress
supports QPSK, 16-QAM, 64-QAM.
3
1
2
4
5
6