IEC 60169-13 Amd.1 Ed. 1.0 b:1996

Amendment 1 - Radio-frequency connectors - Part 13: R.F. coaxial connectors with inner diameter of outer conductor 5.6 mm (0.22 in) - Characteristic impedance 75 ohms (Type 1.6/5.6) - Characteristic impedance 50 ohms (Type 1.8/5.6) with similar mating dimensions

International Electrotechnical Commission , 03/07/1996