农村有线广播依靠外线,将广播信号传送到各用户。但是外线所处的环境复杂,线路长,常发生负载开路、短路等故障,成为有线广播维护管理工作中的一个薄弱环节。本文介 Rural cable broadcasting rely on the outside world, the broadcast signal sent to all users. However, the environment in which the outside line is located is complex, and the line length is long. Frequent open-load, short-circuit and other faults occur and become a weak link in cable radio maintenance and management. This article describes