Cable TV Measurements (Option K20) R&S FSL
1300.2519.12 4.210 E-11
Channel tables
Channel tables are lists of channels, as they occur in a cable TV network. They provide a quick access
to the channels to be analyzed. Depending on its designation, a channel table can contain all channels
of a cable TV network or it can be restricted to a subset of all available channels, e.g. to all digital DVB–
C channels of the cable TV network.
In the Channel Tables dialog box, all available channel tables are sorted in alphabetic order. The name
of a channel table displayed in the list corresponds to the file name of the channel table, excluding the
file extension (*.cht).
The first list entry is < none >. If this entry is selected, no channel table is used. This can be useful for
measurements where no appropriate channel table is available, or if the Cable TV Measurements
option (K20) is used in a R&D laboratory. The Tilt measurement is not possible if no channel table is
used. For a step–by–step instruction refer to "To perform a measurement without a channel table" on
page 4.209.
Some channel tables are provided with the option. In these channel tables, all modulation standards are
set to < unused > (for further details refer to "Modulation standards" on page 4.210). Based on this set,
you can customize your own channel tables. Use the Restore Default Tables softkey to restore the
provided channel tables.
Modulation standards
A modulation standard is a set of parameters defining the modulation properties of a TV signal (as used
in a TV channel). The signal type is the characteristic parameter of this set. Modulation standards are
defined for every channel table individually. As a maximum, 40 modulation standards can be created
per channel table. If, in a channel table, the modulation standard of a channel is set to < unused >, no
modulation standard is defined for this channel and therefore no measurements can be performed for
this channel.
If no channel table < none > is activated, a default modulation standard can be edited and changed via
the Analog TV Settings or Digital TV Settings softkey, but these changes are not saved permanently.
Pressing the PRESET key restores the default settings.
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