中波发射天线塔天调匹配网络设计

Design of Antenna Modulation Matching Network for Medium Wave Transmitting Antenna Tower

贵州省广播电视局八九六台中波天馈系统建设年限已超过15年,天线塔、地网、接地井及地质条件等均发生变化。边带反射增大,导致发射机开机时载频正常,有调制时,反射功率会随着调制信号起伏变化,严重时会出现报警和频繁降功率甚至关机。台站对天调网络阻抗匹配进行重新设计改造,有效地解决了问题。详细介绍天调匹配网络设计方案。

The construction period of the 896 medium wave antenna feeder system of Guizhou radio and television bureau has been more than 15 years, and the antenna tower, ground network, ground well and geological conditions have changed. Sideband reflection increases, resulting in normal carrier frequency when the transmitter is turned on. When there is modulation, the reflected power will fluctuate with the modulation signal, and there will be alarm and frequent power reduction or even shutdown in serious cases. The impedance matching of the antenna network is redesigned by the station and the problem is solved effectively. This paper introduces the design scheme of antenna modulation matching network in detail.