一、引言由于短波段的业务负荷日益增加,单信道的通报方式在频率利用和设备配备上就显得很不经济.合理的方式应该是一条电路能够同时传送多个报路或者是一套设备同时工作几条电路.这种通信方式的优点是非常明显的.它不但减少了通信设备的数量,也更有效地利用了频带,使电台的维护操作有可能简单化和自动化。由于近年来国际简专用用卢道达电报业务的发展和自动电报交换制的采用,短波电路的高效率复用问题 I. INTRODUCTION Since the service load of short-range band is increasing day by day, the notification method of single channel is very uneconomical in terms of frequency utilization and equipment provisioning. A reasonable way should be that one circuit can transmit multiple routes or one set of equipment simultaneously The advantages of this communication method are obvious: not only does it reduce the number of communication devices, but it also makes more efficient use of the frequency band, making it possible to simplify and automate the maintenance of the radio. In recent years, the development of international telegraph service using Lu Da Da and the automatic telegraph exchange system, the efficient reuse of shortwave circuits