BNC Connectors

50 Ohm BNC and 75 Ohm BNC connectors are available.  Styles include BNC male, female, right-angle, bulkhead.  Bayonet Neill-Concelman (BNC) connectors are common RF connectors used with coaxial cable to connect to radio, television, and other radio-frequency electronic equipment. Used for composite video on commercial video devices. It is commonly used on 10base2 thin Ethernet networks, both on cable interconnections and network cards.

50 Ohm vs. 75 Ohm BNC Connectors

Traditional 50 Ohm BNC connectors that are installed on 75 Ohm coaxial video cable cause digital signal distortion which results in digital transmission errors.

The mechanical differences between the two types of connectors are the dielectric insulators and center pins. The 75 Ohm connector employs Teflon as a dielectric and air around its outer spring fingers as compared to Delrin surrounding the spring fingers of the 50 Ohm type. Also the 75 Ohm connector's center pin has the same diameter in the front and rear areas where the pin is crimped to the cable's center conductor; the 50 Ohm connector's pin has a larger diameter in the crimp area. Therefore, different crimp tools are required for two types of center pins.

However, both types on connectors mate mechanically without physical damage. Nevertheless, the 50 Ohm  connector is adequate for analog video applications.