... 严格的频谱限制：severe spectrum limitations 调频广播业务：FM broadcasting services 传播路径衰耗：propagration path loss ...
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BBC world Service is the world biggest network 140 million listeners across the globe broadcasting in 44 languages heard on shortwave, median wave, FM and satellite.
英国广播公司国际广播电台是世界上最大的广播网，在全球拥有一亿四千万听众，可以通过短波、中波、调频和卫星收听以44种语言广播的节目。
FM sound sync-broadcasting has overlapped service zone, the same carrier frequency and the source of the program, which can broadcast in-phase at the same time.
调频同步广播系统是具有重叠服务区，使用同一载频和同一节目源，同时同相位广播的调频发射技术。
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