Rohde & Schwarz R&S FSL3 - Page 111

Cable TV Measurements (Option K20) R&S FSL
1300.2519.12 2.86 E-11
Most important when dealing with modulation standards is the order of the parameters. Modulation
standards (see Fig. 2-62) have always to be created and edited from top to bottom of the Modulation
Standard Options dialog box. The most important parameters are located at the top of the dialog box.
For example, changing the signal type from Analog TV to Digital TV also alters the complete set of
parameters below. Whereas the modulation technique for transmitting the color information is essential
in analog TV systems (see Color System in Fig. 2-62), it does not exist for digital TV systems. The
constellation instead is crucial in digital TV systems (see Fig. 2-63). For that reason the Cable TV
M
easurements option automatically guides you through the whole process of creating a new modulation
standard and only confronts you with mandatory parameters.
A modulation standard is structured as follows:
• The Name is arbitrary, but should refer to the main properties of the TV signal, e.g.
"PAL_BG_STEREO''.
• The Signal Type specifies whether the signal is an analog TV or a digital TV signal.
As mentioned above, all described parameters below depend on the chosen signal type. Therefore the
remaining parameters will be discussed separately in the sequel.
Fig. 2-62 Modulation Standard Options dialog box for analog TV
Analog TV modulation standards
This section describes the parameters that characterize analog cable TV signals. Refer to section
Analog TV Basics to learn more about analog cable TV signals. The parameters discussed here can
also be modified (temporarily) in the Analog TV Settings dialog box.
For analog TV the Modulations Standard Options dialog box (see Fig. 2-62) is structured as follows:
 The channel table references modulation standards by their Name. Its name (see Fig. 2-63) should
comprise information about the used TV standard, the color system and the sound system, e.g.
"PAL_BG_STEREO''.
 Here the Signal Type is always set to Analog TV.
 The TV Standard characterizes the way the luminance information is modulated. The following
analog TV standards exist:
 B/G
 D/K
 I