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广播电视发射天线是发射机末级输出回路的负载,其作用是:将发射机输出经馈线传输而来的高频电能以电磁波的形式辐射出去,实现对周边地区的信号覆盖,天线性能的好坏直接影响节目的传输质量和播出效果。由于天馈线系统处于室外高空全天候工作,常年经受着高寒、酷署、冰雪、暴雨和大风的侵袭,导致天线上的绝缘材料老化及金属材料锈蚀得都很快。而安装天线的地方又不像发射机所在的机房经常有人巡视,天线出了毛病通常不易觉察和维修。特别是大功率发射台,由于承担发射任务重,覆盖
The radio and television transmitting antenna is the load of the final stage output circuit of the transmitter. Its function is to radiate the high frequency power transmitted by the transmitter output through the feeder to the electromagnetic wave and achieve signal coverage to the surrounding area and good antenna performance Bad direct impact on the program’s transmission quality and broadcast effect. As the antenna feeder system is working outdoors at high altitudes and weathering all year round with alpine, cool weather, ice and snowstorm, heavy rain and gale, the aging of the insulating materials on the antenna and the corrosion of metal materials are very rapid. The place where the antenna is installed is not like the transmitter where the engine room is often patrolled, the antenna is usually not easy to detect problems and maintenance. In particular, high-power launch pad, due to assume the task of launching heavy coverage