Amphenol Connex SMA Series Cable Assemblies Amphenol Connex SMA Series Cable Assemblies are 50Ω semi-precision, subminiature connectors that provide excellent electrical performance from DC to 18 GHz. The SMA series is high-performance, compact in size, and has outstanding mechanical durability, and are available in lengths from 6 inches to 4 feet. The Amphenol Connex SMA Series Cable Assemblies are ideal for phase array radar, test equipment, ILS landing systems, and other instrumentation using phase matching techniques. Learn more View the new offering of Conformable Semi-Rigid Assemblies that can be formed by hand.