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三、接收电路和射频电路,如图7所示 TV接收电路是由天线输入和输出电路、频道选择电路、图像中频电路和伴音中频电路组成。通过以上处理后获得稳定的中频信号和伴音信号,然后送入射频调制器被转换成一固定频道供电视接收机来接收。 1.天线输入和输出电路的功能。 (1)V—K70J录像机的天线输入和输出电路装有2IN1调谐器。 (2)OSD方式,射频调制器输出能够选择混频式
Third, the receiving circuit and the RF circuit, shown in Figure 7 TV receiving circuit is composed of the antenna input and output circuits, channel selection circuit, the image IF circuit and audio intermediate frequency circuit. After the above process to obtain a stable IF signal and audio signal, and then sent to the RF modulator is converted into a fixed channel for the TV receiver to receive. 1. Antenna input and output circuit functions. (1) The V-K70J VTR’s antenna input and output circuit is equipped with a 2IN1 tuner. (2) OSD mode, RF modulator output can choose to mix