ITU-R INFORME M 1158 SPANISH-1990 Data communication in the maritime mobile services using MF HF and VHF frequencies《中频(MF) 高频(HF)和甚高频(UHF)频段陆地移动服务数据交流》.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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