ITU-R INFORME BO 954-2 SPANISH-1990 Multiplexing methods for the emission of several digital audio signals and also data signals in broadcasting《几个数字音频信号的发射和在广播还数据信号的复用方法》.pdf

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ITU-R RAPPORT M 766-2 FRENCH-1990 Feasibility of frequency sharing between the GPS and other services《全球定位系统和其他服务之间的频率共享的可行性》.pdf

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