BS EN 61169-16:2007
射频连接器.分规范.外导体内径为7 mm(0.276 in)的螺纹连接射频同轴连接器.特征阻抗50 Ω(75 Ω)(N型)
Radio-frequency connectors. Sectional specification. RF coaxial connectors with inner diameter of outer conductor 7 mm (0, 276 in) with screw coupling. Characteristic impedance 50 ohms (75 ohms) (type N)