中频失谐故障根据其故障点的不同,其表现形式也多种多样。当出现例1所述故障时,可以肯定其故障点在图像检波中周,在电视发射机图像调制器中是利用1V_(p—p)的视频信号对38MHz的中频载波进行调制,其一重要指标即为图像调制度,图像调制度是表征图像信号在输出的中频已调试中所占的功率份额大小 IF detuning fault according to the point of its failure, its performance is also varied. When the failure described in Example 1, we can be sure its point of failure in the image detection week, the TV transmitter image modulator is the use of 1V_ (p-p) of the video signal on the 38MHz IF carrier modulation, an important The index is the degree of image modulation, the degree of image modulation is the representation of the image signal in the output of the intermediate frequency has been debugging the proportion of the share of power