标准摘要
[中文适用范围]： 修改仅适用于图 11。
英文名称Amendment 1 - Radio-frequency connectors. Part 21: Two types of radio-frequency connectors with inner diameter of outer conductor 9.5 mm (0.374 in) with different versions of screw coupling - Characteristic impedance 50 ohms (Types SC-A and SC-B)