ITU-R INFORME BO 1228 SPANISH-1990 High quality sound data standards for the broadcasting satellite service in the 12 GHz band《12 GHz频段广播卫星业务的高质量声音 数据标准》.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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