What is a coaxial cable?

What is a coaxial cable?

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What is a coaxial cable?

Coaxial cable consists of 4 elements:

  • a conductive wire which often consists of copper, silver copper or silver steel
  • an insulator
  • shielding, often made of metal, to protect data transmitted by cable
  • a generally rubber sheath

Coaxial cable allows you to connect different audio and video devices together. It transmits data from digital and analog signals, both high and low frequency. It can thus connect an antenna to a radio or a television set.

When is a coaxial cable used?

In our homes as in professional premises, coaxial cables are widely used today. They are found as follows:

  • in telecommunications
  • to ensure the proper functioning of radios and televisions
  • in IT, via Ethernet networks
  • in urban cable networks
  • in submarine cables
  • in the military, medical, etc.
  • in aerospace

What are the advantages of a coaxial cable?

Coaxial cable has been widely used for decades, even if it is gradually replaced by RJ 45 cables. It has also disappeared in favor of fiber optics in big cities for ten years.

However, its high performance makes it an essential element. Its technical characteristics allow it in particular to receive and transmit digital and analog signals without risk of interference.

Space-saving, resistant to temperature changes, flexible and robust: these are some advantages of the coaxial cable!

What are the disadvantages of coaxial cable?

Like any material or component, coaxial cable also has disadvantages. Its main disadvantage is that its installation is quite difficult. It is generally recommended to call an electrician or a professional to ensure its proper installation in your home.

However, it is possible to install it without calling a professional. It is then necessary to follow a certain method of electrical connection, but this may require doing it repeatedly.

How to choose a coaxial cable?

It is necessary to rely on specific criteria to choose a coaxial cable. An unsuitable or poor quality coaxial cable leads to a risk of poor data transmission, or may not function despite a correctly installed installation.

In order to choose a good coaxial cable, the following criteria must be taken into account:

  • cable length: depending on the installation required, the cable must be longer or shorter. Before purchasing and installing, remember to take the necessary measures.
  • independence: for a domestic installation (TV, TNT, etc.), it is recommended to opt for a 75 ohm cable. In a professional environment, it is advisable to install a 50 ohm cable (an RG-8 cable). In both cases, the cable must be perfectly matched to the antenna impedance.
  • cable thickness: the longer the coaxial cable, the more it is possible to lose frequency. Choose an 11mm cable if you need a long cable. For a shorter cable, 6mm is sufficient.
  • cable type : there are different types of coaxial cables. The most common is the RG-59 cable. For private use, the RG-6 cable will be perfect. In the case of the connection of a Wi-Fi antenna, the RG-174 cable will be very suitable.

To make sure you make the right choice, do not hesitate to call an electrician, who will be able to advise you based on your installation and your needs.