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五、干扰、天线和防雷1.电视机屏幕上的重影收看电视节目时,在主图象旁边出现一个相同的图象,有时甚至出现二个、三个以至更多,这叫重影如图1,它严重地影响收看效果。各类重影的现象、原因及解决途径:(1)电视机接收的信号有直接从电视台发射来的直射波;有从附近高大建筑、楼房、铁路、桥梁、高压电线或者高山过来的反射波;还有从四周墙壁来的折射波。这些信号的强
V. INTERFERENCES, ANTENNAS AND LIGHTNING PROTECTION 1. Ghosting on the TV screen When watching TV programs, an identical image appears next to the main image, sometimes even two, three or more. This is called ghosting As shown in Figure 1, it seriously affects the viewing effect. The phenomena, causes and solutions for various types of ghosting: (1) The signal received by the television set has direct waves transmitted directly from the television station; reflected waves coming from nearby tall buildings, buildings, railways, bridges, high-voltage wires or mountains There are refracted waves from the surrounding walls. These signals are strong