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NOT 553-2001-en

CATV COAXIAL CABLE NETWORKS DISTORTIONS

Description: 

one of the most important problems that the installer faces when building up a tv distribution network is the distortion.

distortions limit the channel capacity and size of the coaxial cable tv distribution networks.

the remaining question is, how these distortions can be identified and calculated.

there are four main sorts of distortions affecting both video and sound signals when they travel all along the coaxial cable :

  • carrier-to-cross-modulation ratio
  • second order distortions
  • third order distortions
  • composite second, composite third order distortions

a cable system has always some kind of distortion present.

when a distribution system is designed, distortions are calculated for the worst case at the farthest point in the system.

these are depending upon:

  • type of amplifier
  • the channel loading
  • the number of amplifiers installed in cascade.

a db ratio is the unit used to quantify the distortion.

it is the ratio between the wanted level signal and the unwanted level distortion.

obviously, the larger is this ratio the better will be the quality of the picture.

Id Anrterior: 
83
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