By: Satish Balakrishnan. Dictionary Dictionary Term of the Day. Machine Intelligence. Techopedia Terms. Connect with us. Sign up. Term of the Day. Best of Techopedia weekly. News and Special Offers occasional. It is also used for many types of signal connections like: Serial digital interface and analog signals High-tech video networks Amateur radio antenna connections Electronic test equipment Aviation electronics or avionics The BNC connector is widely used in electronics although it is being superseded by the LEMO 00 mini-connector that handles higher densities.
Share this Term. Tech moves fast! Stay ahead of the curve with Techopedia! Join nearly , subscribers who receive actionable tech insights from Techopedia. Thank you for subscribing to our newsletter! It has also been shown to stand for Bayonet Navy Connector in some references. The BNC connector is essentially a miniature version of the C connector which was in turn a bayonet version of the N-type connector.
The BNC connector was developed as a result of the need to provide a high quality, robust connector that would be capable of being used in a wide variety of applications. Additionally it needed to be smaller than either the N-type or C-type connectors which were much larger. The specifications of the BNC connector naturally vary from one manufacturer to another and it is always best to ensure that the particular component being purchased is suitable for the intended application.
However there are a number of guidelines that can be used. The connector comes in two basic types:. Of the two versions of the BNC connector, the 50 ohm version is more widely used. Often the BNC connector is specified for operation at frequencies up to 4 GHz and it can be used up to 10 GHz provided the special top quality versions specified to that frequency are used. However it is wise to fully check the specification.
BNC connectors come in a variety of formats. Not only are there plugs and sockets but there are also adapters and also other items such as attenuators. BNC plugs are designed not only for the required impedance, but also to accept a particular coax cable format. In this way all the internal piece parts are compatible with the coaxial cable used. It is therefore necessary to specify the BNC plug for use the cable to be used.
Although there is some latitude, it is naturally best to select the correct cable format. In addition to this there are straight and right angled variants. Of these the straight connectors are the most widely used, although right angled connectors where the cable leaves the plug at right angles to the centre of the connector centre line are also available. These are ideal in many applications where the cables need to leave the connector in this manner to ensure cables are in a tidy fashion, or where space is at a premium.
Unfortunately right-angled connectors have a marginally higher level of loss than their straight through counterparts. This may not be significant for most applications, but at frequencies near the operational limit of the connector there may be a small difference. The sockets or female BNC connectors also come in a number of flavours. The very basic BNC connector consists of a panel mounting assembly with a single connection for the coax centre.
The earthing is then accomplished via the panel to which the connector is bolted using a single nut. Large washers can be used to provide an earth connection directly to the connector. Some of these connectors may also use four nuts and bolts to fix them to the panel.
These arrangements are only suitable for low frequency applications, and not for RF. Where impedance matching and full screening is required. Bulkhead mounting connectors where coaxial cable entry is provided are available for this.
Again these are available for a variety of cable dimensions and the correct type should be used. The assembly of a BNC connector will depend upon the type that is to be used.
Both types require assembling wit reasonable care, and the crimp style requires a crimp tool for its assembly. The compression gland type of BNC connector has the centre pin of the connector which is usually a solder pin and the braid and sheath of the cable are held by an expanding compression gland fixed by a nut at the rear of the connector.
This type of connector by its nature can cope with a limited range of cable sizes and requires no specialised tooling to assemble. This makes it ideal for small quantity production, either for one off cables for laboratory use of for limited production runs.
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