ITU-R INFORME M 1161 SPANISH-1990 Use of MF HF DSC for automatic connection of calls in the maritime-mobile service MF and HF bands to the public switched network《高频(HF)和中频(MF)海洋移动.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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