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Do you need Quad shielding? What about braiding? Do you need to get Plenum Rated cable? Or Direct Burial? There is a seemingly endless list of options and picking the wrong type of coax could result in spending a lot more money than what you were planning. In this comprehensive article we'll go through a few basics of coaxial cable so you should know what you need.
Coaxial cables use RG ratings to distinguish between the different kinds of cables. Literally dozens of coaxial cables have been made over the years, but the only ones that most people need to worry about are RG 6 cable and RG 59 cable, so those are the two types we are going to focus on here. What you really need to consider are the frequency ratings your equipment uses.
RG59 cable has been around for a long time. This cable used to be what most people used for their cable TV connection and is very commonly installed in older homes and commercial buildings. However, many modern signal requirements have made this cable less popular in the last few years. The braided shielding in RG 59 was designed around relatively long waveforms of megahertz interference.
That makes it good for lower frequency signals anything under about 50 MHz. It is commonly used for composite or component video signals often in the mini-coax variety. That also makes it a good choice for a closed circuit television CCTV video surveillance system. By using this type of cable, you can run the power and video for your security cameras simultaneously, effectively cutting your install time in half.
Satellite and internet signals run at higher frequencies than traditional analog video, and when TV broadcasts changed from analog to digital, and cable companies started switching to digital, the higher freuqencies made it necessary to find a more effective coaxial cable. RG6 cable was designed to fulfill these requirements. It has a larger conductor, which gives you much better signal quality. The dielectric insulation was made thicker as well. RG 6 is also made with a different kind of shielding, which allows it to more effectively handle Ghz level signals.
While many RG 59 cables uses a foil shield in addition to the braid, RG 6 made it mandatory. The braid was originally in a looser weave e. Deciding between RG 59 and RG 6 is only part of the process. Each class of cable can have different types of shielding or jacket and may or may not be rated for your chosen installation. Some say that it means "universal" or "for general utility use. If you need a certain type of jacket, make sure and check the specs.
But we'll get into different jacket types later on. Shielding prevents 'noise' from interfering with your signal, and therefore preserves your signal quality. Coaxial cables usually come with two types of shielding: braid and foil. Most coaxial cables include both although some RG 59 cables still use single shielding. In general, the more shielding you have, the better your cable will perform, especially in longer runs, but there are differences in what the shields protect.
Foil shielding typically involves an aluminum or mylar foil bonded to the dielectric, underneath a metal braid. Foil is very effective at protecting against high frequency electromagnetic interference EMF.
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