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一般电视机的高频头与中放级之间均有一耦合电容,如图中的2C_1。高频头特性曲线与中放曲线以及高频头与中放电路的总特性曲线好坏,对电视机的灵-敏度、选择性及清晰度影响极大。中放吸收回路(调整2L_2、2L_4、2L_3)的吸收点分别为26.25MHz、27.75MHz、35.75MHz,再调整2L_1使曲线为图2所示的形
There is a coupling capacitor between the tuner and the middle stage of the general TV set, as shown in 2C_1. The characteristic curves of tuner and tuner, as well as the total characteristic curve of tuner and tuner, have a great influence on the spirit-sensitivity, selectivity and sharpness of the television set. Put in the absorption circuit (adjust 2L_2, 2L_4, 2L_3) absorption points were 26.25MHz, 27.75MHz, 35.75MHz, and then adjust the 2L_1 curve so that the shape shown in Figure 2