随着目前电视事业的发展,特高频电视广播已普遍投入使用。但是早期国产的12吋和14吋黑白电视机没有UHF调谐器,同时原有的VHF调谐器也不具备配接UHF调谐器的相应电路和插孔。所以对部分电视机用户来说是一件遗憾的事情。这里就介绍一种经济、简便易行的办法,通过一个所谓的中频接口电路,使UHF调谐器和电视机中放通道直接配接起来,接收特高频电视广播节目,满足大家的需要。 With the current development of television, UHF television broadcasting has been put into operation. However, the earlier domestic 12-inch and 14-inch black-and-white TV sets did not have a UHF tuner, and the original VHF tuner did not have the corresponding circuit and jack for the UHF tuner. So for some TV users is a matter of regret. Here is an economical and easy way to meet the needs of everyone through a so-called IF interface circuit that allows the UHF tuner to be directly paired with a TV channel to receive UHF television broadcasts.