中波双频共塔天调网络的原理分析实例

Example of Principle Analysis of Two Medium-wave frequencies Common Antenna Impedance Matching Networks

根据功率最大传输定理要使中波广播发射机向天线传输功率的效率最大,必须使天线的阻抗与发射机的阻抗匹配。在中波广播发射系统中,天调网络是实现阻抗匹配的核心环节。为了节省天线和场地等资源,中波发射台通常使用双频共塔模式,使2个频率节目共用一个天线。通过网络元件的参数进行计算,分析双频共塔天调网络的阻塞网络、匹配网络、陷波网络、防雷部件的工作原理,达到对天调网络原理的理解,提高维护水平。

According to the power maximum transmission theorem,in order to maximize the efficiency of the medium wave broadcast transmitter to transmit power to the antenna,the impedance of the antenna must match the impedance of the transmitter.In the medium wave broadcasting transmission system,the tuner network is the core link to realize impedance matching.In order to save resources such as antennas and venues,medium-wave transmitters usually use a dual-frequency co-tower mode,so that two frequency programs share one antenna.Through the calculation of the parameters of the network components,the working principles of the blocking network,matching network,trap network,and lightning protection components of the dual-frequency common-tower antenna network are analyzed,so as to understand the principle of the antenna network and improve the maintenance level.