Coaxial Cable Vs Triaxial Cable
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Coaxial cable (or 'coax') is the commonest cable used for transmitting video alerts. The name 'coaxial' refers back to the common axis of the two conductors.
Thus, cale capacitance is immaterial for video and digital applications. A coaxial cable has a strong copper or copper-clad-steel centre conductor surrounded by a non-conductive dielectric insulating material. The dielectric is surrounded by foil protect/s and/or copper braid/s which kind the outer conductor and likewise shield in opposition to electromagnetic interference (EMI).
However there's another impact that may cause lack of element fast-risetime alerts. There is such a thing as frequency-dependent losses within the cable. There can be a property of controlled impedance cables known as dispersion, the place different frequencies travel at barely different velocities and with barely different loss. This is similar to coaxial cable besides the spacing between center conductor and protect isn't carefully managed throughout manufacture, leading to non-fixed impedance. In common, a relentless impedance (together with connectors) cable, when terminated at each ends with the proper load, represents pure resistive loss.
There exist an effect that characteristic impedance of a cable if modified with frequency. If this frequency-dependent change in impedance is giant enough, the cable will be impedance-matched to the load and supply at some frequencies, and mismatched at others.