BNC Series Connectors - 50 ohm designed to operate over a frequency range of DC to 4 GHz. Miniature bayonet BNC connector styles offer a quick connect/disconnect feature desirable for test applications. SC Series Connectors - similar to "C" series bayonet types, but are threaded to provide a more solid coupling. Originally designed for use with aircraft avionics, these BNC connectors are ideal for other equipment requiring a high tolerance for vibration.