BNC Cable Assemblies Amphenol RF BNC Cable Assemblies feature a bayonet coupling mechanism that provides positive quick mating and unmating while offering high reliability. These assemblies are available with 50Ω and 75Ω impedance, enabling users to match impedance to system requirements. This series accommodates a wide range of RG flexible coaxial cables and low-loss LMR cables. Amphenol RF BNC Cable Assemblies are often used in broadcast applications.