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75Ohm RG6 Coax Cable for CCTV Camera

Shenzhen KW-LINK Electronic Co.,Ltd | Updated: Jul 31, 2016

     All of the common RG designations apply to various types of coaxial cable. Some people think "coax" or "coaxial" cable means "antenna cable," or "cable with F-connectors," or some such thing, but coax is a much more general classification. Any cable which has two conductors which share a single common axis is a coaxial cable--a center conductor, accompanied by a shield, the two being kept apart by a dielectric and wrapped in an outer jacket. All common video cable types are coaxial cables, though that's harder to see in some than in others--for example, s-video cable typically is two mini-coaxial cables combined either in a common outer jacket or a zip-cord type arrangement.

     Take RG-6, for example. The only thing one can say generally about RG-6 type coaxes is that they have an 18 AWG center conductor. An RG-6 might be a cheap generic CATV coax, designed strictly for economy, with a thin aluminum braid and a copper-coated steel center conductor; it might be a better-grade CATV coax, with an aluminum "quad shield" arrangement; or it might be a precision serial digital video coax like Belden 1694A, with a dense copper braid and double-foil shield, solid copper center conductor, nitrogen-injected PE foam dielectric, and extremely broad bandwidth and tight impedance tolerance. When people ask, "can I just use RG-6 for this application," the only correct answer is a question: what do you mean by "RG-6"? High-bandwidth serial digital video and cable TV distribution may both use RG-6 type cable, but that doesn't mean that the cable for one is necessarily suitable for the other.