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随着电视接收机的普及,一些地区的屋面上,室外电视接收天线已经林立密集.为了减少屋面上架设的电视天线,设法使几台电视机合用一副天线,仍然是一个比较好的措施.本文介绍的两种简易合用电视天线,均采用电阻网络进行阻抗匹配,如图1;虽来加特殊的隔离措施,经实验在电视场强允许的情况下效果尚好,未发现电视机相互间有明显的干扰.一、阻抗匹配的原理为了使电视接收机能满意地重现电视图象,除了电视机本身的性能应该满足要求之外,天线——馈线——电视机调谐器的输入端三者之间阻抗的匹配是一个关键.
With the popularization of television receivers, outdoor television receiving antennas are already densely arranged on the roofs of some areas, and in order to reduce the number of TV antennas erected on the roofs, it is still a good idea to try to use several antennas with a couple of television sets. This article describes the two simple combination of TV antenna, resistor network are used to match the impedance, as shown in Figure 1; although to add special isolation measures, the experimental field of television allows the case of the effect is still good, did not find the TV with each other Obvious interference First, the principle of impedance matching In order to make the TV receiver can reproduce the TV image satisfactorily, in addition to the performance of the TV itself should meet the requirements, the antenna - feeder - TV tuner inputs three The matching of impedances is a key.