How cable television works

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Nowadays, cable television refers to any system that distributes signals through coaxial or fiber optic cables. Cable television was used in the USA in the late 40s to improve reception of commercial network broadcasts. Since then, there has been a proliferation of cable television systems offering special services.

Cable system bandwidth has increased with the increase of the program options. As technology progressed with fiber optics and analog to digital conversion, quality and feature improved. Coaxial cables can carry many different channels into homes on a single RG-6 coaxial feed. However, it is also possible to use thicker RG-11 coaxial cables for high definition cable service as well as for the internet.

Coaxial cables are manufactured to meet the increasing requests of high speed data and video. They are flexible and suitable for extreme environmental conditions. In order to avoid signal distortions or interferences, the coaxial cables must be manufactured ensuring high quality of the final product. The choice of material and manufacturing process is essential to produce a coaxial cable which does not have any problems in its final application.

Designing a drawing and extrusion line for high quality coaxial cables is a straightforward process that, however, requires a deep understanding of the final product, application and specific needs of the end user. Television cable as coaxial cables are composed of wire conductor and different insulation layers including a foamed section, each of them serving a specific purpose. The braided wiring can be made in aluminum or copper and is the part which carries the actual signal in a radio frequency format. The wiring is covered by sheath specifically designed in order to prevent incoming interferences and signal leakage. Thereafter, over the sheath, it is also possible to put a metallic layer which strengthens the prevention of signal interference. To sum up, the outer layer must be:

  • Thick;
  • Durable;
  • Resistant in order to withstand all environmental conditions.