R&S FSL Cable TV Measurements (Option K20)
1300.2519.12 2.71 E-11
Measurements of the first group can also be done in the Spectrum Analyzer mode. The advantage of
the measurements of the Cable TV Measurements option is that they are automatically parameterized
with information according to the channel table and the modulation standards. Measurements of this
type are:
Spectrum measurement
Channel Power measurement
APD measurement
CCDF measurement
Digital TV measurements that base on output of the QAM measurement demodulator are:
Overview measurement
Constellation Diagram measurement (modulation analysis)
Modulation Errors measurement (modulation analysis)
Echo Pattern measurement (channel analysis)
Digital TV settings
The Cable TV Measurements option needs to know some of the parameters described in section Digital
TV Basics to perform correct measurements. It therefore stores these parameters in the so–called
"modulation standard". Refer to section Modulation standards for the creation and usage of a
modulation standard. Section Digital TV modulation standards contains the description of the
parameters that have to be characterized for a digital TV signal. The following list explains the meaning
of the parameters:
• Name: Choose an arbitrary name for the new modulation standard.
• Signal Type: If you want to characterize an digital TV signal, select Digital TV.
• TV Standard: Select a TV standard to initialize the following parameters.
• Constellation used in the transmitter, e.g. 64QAM.
• Symbol Rate of QAM signal.
• Roll–Off factor of root raised cosine TX filter.
• Sideband Position: Is the signal in normal position or inverted?
Note: In the dialog boxes, set the parameters always from top to bottom, since all parameters depend
on the parameters above them. Otherwise your input might be rejected, e.g. if it specifies an
unusual TV standard.
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