本刊95年第9期刊出“550MHz增补频道高频头”一文后,收到很多读者来信,现对于加装中的问题综合答复如下。 从使用实践看,增补频道高频头(简称增高头)的增补频率范围要适当宽些,即各个频段的频率要“连续”,如V_L段增补高端频率要高于175MHz,以覆盖Z_7并延伸,V_H段增补低端频率不低于215MHz,该段增补高端频率不低于500MHz(最好延伸至550MHz),以保证整个增 The 95th issue of 9th issue of “550MHz additional channel tuner” after receiving a lot of readers letter, now for the installation of the comprehensive answer is as follows. From the practice point of view, the additional frequency range of the supplemental channel tuner should be appropriately wider, that is, the frequencies of all the bands should be “continuous”. For example, supposing the V_L segment should be higher than 175MHz to cover the Z_7 and extend , V_H segment added low-end frequency of not less than 215MHz, the paragraph supplement high-end frequency of not less than 500MHz (preferably extended to 550MHz) to ensure that the entire increase