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近年来,不论是发达国家还是发展中国家,对于短波广播在国际上的重要性有了重新的评价,这是由于短波电波的固有特性可以越洋跨海,覆盖广大的地区。但是,只要收听过一次短波广播的人都会感到,由于电台十分拥挤,相互之间造成差拍干扰以及由于电波衰落而引起的失真,使得收听效果并不理想。
In recent years, both developed and developing countries have reevaluated the international importance of shortwave broadcasting because the inherent characteristics of shortwave waves can cross the ocean and cover vast areas. However, anyone who has ever listened to a shortwave broadcast feels that the listening performance is not satisfactory due to radio stations being crowded, causing beat interference with each other, and distortions caused by the fading of radio waves.