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坐落在西安城南、傍依历史博物馆的邮电部第四研究所是中国最早从事微波通信技术应用与开发的专业机构。建所30余年来,第四研究所研制开发了60路、600路、960路、1800路模拟微波通信系统;30路、120路、480路、1920路数字微波通信系统;SCPC卫星地面站,点对多点微波通信系统,无人值守微机监控系统,900MH2移动通信手拉机,以及新一代双向CT—2系统等产品,
Located in the south of Xi’an, the 4th Research Institute of the Ministry of Posts and Telecommunications near the Museum of History is the earliest professional institute engaged in the application and development of microwave communication technology in China. For more than 30 years since its founding, Institute No.4 has developed 60, 600, 960, 1800 analog microwave communication systems; 30, 120, 480, 1920 digital microwave communication systems; SCPC satellite ground stations, Point to multipoint microwave communication system, unattended microcomputer monitoring system, 900MH2 mobile communication hand machine, as well as a new generation of two-way CT-2 system and other products,