75波特/180 Hz调频音频电报机技术要求和测试方法
Specification and measuring method of frequency-modulated voice-frequency telegraph set for a modulation rate of 75 bauds with channels spaced at 180 Hz
标准状态
发布于：1985-11-12
实施于：1986-07-01
已废止
基本信息
内容预览
Specification and measuring method of frequency-modulated voice-frequency telegraph set for a modulation rate of 75 bauds with channels spaced at 180 Hz