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Everyone loves to listen to the radio every now and again and it can be seen as a nostalgic piece of equipment for some individuals. This is even truer when you consider that everyone either listens to music using applications like Spotify or listens to the radio on their mobile devices. However, unlike the mobile device, the radio requires electricity to run and for it to function properly it need a special kind of cable, known as a Bayonet Neill-Concelman (BNC).
The BNC is a form of connect/disconnect radio frequency connector and is often used with a coaxial cable – a cable that is also used in radio frequency connectors because the insulation allow the cable to be placed near another metal object without losing power. The BNC connector features two bayonet lugs and when the male end of another cable mates with the connector a quarter turn of the coupling nut is required.
There are not many other connectors that use the bayonet connection style, but there are similar additions as well as a thread connection (which will not be covered in this article).
What is a BNC Connector Used For?
As previously mentioned, the connector is designed to be used with radio frequency equipment including radios, televisions, instruments and even computers. The early application of the BNC connector was originally designed for computer networks and was used for IBM’s PC network and the 10BASE2 version of Ethernet.
To be more precise, the connectors were actually used and designed by the military for their radio equipment, as opposed to public use. However, the military were unable to use the cable efficiently because it tended to leak radio signals up to 4 GHz. The cable was useable but at around 11GHz, it became unstable. It is for this reason why the connector came into the public use and was also used for signal connectors for things like amateur radio antennas and aerospace electronics.
As well as its military and signal use, the BNC was also used on commercial electronic devices. In particular, it was widely accepted to be used with video equipment, as well as digital recording equipment which could be found in recording studios.
Different Types of BNC Connector
There are two different versions of the BNC connector that vary in ohm. They include the 50 ohm and 75 ohm versions and they not only work differently but look different as well.
The 75 ohm connector differs in the sense that it has a reduced dielectric in the plugs. In fact, in order to make the two more distinguishable in the 70s, there was a recommendation that the 70 ohm variant should be coloured red so that a difference could be made. Although this difference was used, it did not become standard among all produced 70 ohm BNC connectors.
In terms of their application, they are used for different systems. The 70 ohm connector tends to be used for video equipment and Telco central office installations, whereas the 50 ohm BNC is often used to stream data.
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