BNC Connector Types & Applications

BNCBNC (Bayonet Neill Concelman) Coaxial connectors are the mostly widely used RF connectors. They are used in any coaxial or screened cable application, particularly RF applications. A BNC connector is used on test a wide range of equipment including oscilloscopes, audio generators, power meters and function generators.

BNC Attributes

The BNC connector uses a bayonet fixing to prevent accidental disconnection if the cable is pulled or repeatedly moved. It is a constant impedance connector. In other words, it has the same characteristic impedance across the whole of the connector. Coax cable has “characteristic impedance”. Consequently RF signals travelling along a coax cable will see no impedance changes as they pass through the BNC connector. This is vital for RF applications as it will result in few reflections and a lower level of loss.

BNC Specifications

The connector is available in two basic types – 50 ohm and 70 ohm. 50 ohm is most widely used. It is typically specified for frequencies up to 4 GHz (and can be used up to 10 GHz when specified for). There is a variety of BNC connector formats. There are plugs and sockets as well as adapters and attenuators.

BNC Types

There are several BNC connector types available. The main difference between them is in the way they are attached to the cable.

A BNC compression connector is a one piece F connector. With the help of a cable stripper and a compression tool, you can easily attach the connector to the cable.

Crimp on
There are two styles of BNC Crimp on connectors – 2 piece and 3 piece. Using a cable stripper and a compression tool you can achieve a secure attachment of the BNC crimp on connector to the coaxial cable. The crimp on type BNC is widely used.

Twist on
The Twist on BNC connector requires no tools to attach – just the cable. it is twisted onto the cable by hand.
All three types achieve the same goal and the chief difference between them is the way they are attached to the cable.