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邮电部第一研究所在1981年推出150MHz移动通信系统的基础上,又研制出450MHz移动电话系统。其中小容量系统已售给广州电信局使用,今年又推出中容量系统. 这个系统包括基舍收发信机8个信道、空腔谐振器4个,控制终端(用户集中器)4个信道、8个车台,已于1988年通过了院级鉴定。上海市邮电管理局、长江通信设备工程公司、邮电部杭州通信设备厂、上海无线
Based on the introduction of the 150MHz mobile communication system in 1981, the First Institute of Posts and Telecommunications developed a 450MHz mobile phone system. Among them, the small capacity system has been sold to Guangzhou Telecom Bureau and this year it has also launched the medium capacity system, which consists of 8 channels of Al-Qaeda transceivers, 4 cavity resonators, 4 channels of control terminals (subscriber concentrator), 8 A car station, passed the hospital-level appraisal in 1988. Shanghai Municipal Posts and Telecommunications Administration, the Yangtze River communications equipment engineering company, Ministry of Posts and Telecommunications Equipment Factory in Hangzhou, Shanghai Wireless