美国 Safetran’s 公司最近研制出一种最新型式的无线电调度系统。该系统装设了一种移频键控数据系统,可在同一线路上传输数据。改型后的 CDRC-Ⅱ型设备中,装置了一个简单的附加电路,以将送入线路上的数据和话音频率成分分开,实现同时传输而无干扰。无线电接收机的射频信号场强强度判决器,根据来自每个基地台的接收机输出的射频电平强度进行抽样判决,选出瞬时收到的最强的移动 Safetran’s US company recently developed a new type of radio scheduling system. The system is equipped with a frequency shift keying data system that can transmit data on the same line. The modified CDRC-II device incorporates a simple additional circuit that separates the incoming line data from the voice frequency components for simultaneous transmission without interference. The RF signal field strength determiner of the radio receiver performs a sampling decision based on the RF level strength output from the receiver of each base station and selects the strongest movement instantaneously received