DekTec DTC-379 C2Xpress - Manual (Page 11)

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Essential Tools for Digital-TV Professionals February 2015
DTC-379 C2Xpress
- Outp. bandwidth
Output bandwidth in number of carriers. 0 selects the default output bandwidth. The output
bandwidth must be a multiple of the carrier spacing.
- RMS
The Root Mean Square (RMS) of the complex samples. This value should be set as large as
possible to have the largest SNR, but small enough to avoid saturation. When a DekTec card is
used for play-out of the I/Q samples, the value 5000 is a good value.
- Test pts
Enables the generation of test point data files according to the document: “Generating DVB-C2
Reference Streams”. Test points have to be separated by commas. The following test points are
supported: 1, 7, 8, 10, 13, 15, 18, 20, 22, 26, 27, 31, 32, 33, 37, 40, 41 and 42.
- Filter len
The number samples of the OFDM symbol transition zone on which filtering is performed.
This is an experimental parameter. The valid range is 0…32 for guard interval 1/128 or 0...64
for Guard Interval 1/64.
7.5.2. RF Output settings
In case the output type DVB-C2 RF is selected this area allows the selection of the DVB-C2 capable
modulator card and the RF parameters. The “From params" button allows you to derive the carrier
frequency from the DVB-C2 parameters.
DVB-C2 RF output settings
- Freq. offset
Output frequency offset by means of the distance in number of carriers from the start frequency
of the C2 System. The offset must be a multiple of the carrier spacing.
This option in combination with the output bandwidth allows you to generate a part of the
spectrum of the C2 System, starting at ‘start frequency’ + ’output frequency offset’ and ending at
‘start frequency’ + ’output frequency offset’ + ‘output bandwidth’.
- Outp. bandwidth
Output bandwidth in number of carriers. 0 selects the default output bandwidth. The output
bandwidth must be a multiple of the carrier spacing.
- Channel
Carrier frequency for the RF signal.
- Level
Level (in dBm) of the output signal.
- Filter len
The number samples of the OFDM symbol transition zone on which filtering is performed.
This is an experimental parameter. The valid range is 0…32 for guard interval 1/128 or 0...64
for Guard Interval 1/64.