IEC 60169-20:1985
射频连接器 第20部分:外导体内径为2.08mm(0.082 in)的螺纹连接射频同轴连接器 特性阻抗50Ω(SSMC型)
Radio-frequency connectors. Part 20 : R.F. coaxial connectors with inner diameter of outer conductor 2.08 mm (0.082 in) with screw coupling - Characteristic impedance 50 ohms (Type SSMC)