ITU-R REPORT BS 1201-1990 Number of HF sound broadcasting transmitters using a single channel《使用单通道的短波(HF)广播发射机编号》.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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