IEC 60169-17:1980
射频连接器 第17部分:外导体内径为6.5mm(0.256 in)的螺纹连接射频同轴连接器 特性阻抗50Ω(TNC型)
Radio-frequency connectors. Part 17 : R.F. coaxial connectors with inner diameter of outer conductor 6.5mm(0.256 in) with screw coupling - Characteristic impedance 50 Ohms (Type TNC)