96年第6期本刊发表的“普通彩电也能收到增补台”一文(下称“普”文)收到不少读者来信,现综合回答如下。 众所周知,普通彩电是可以收到增补电视台节目的,但是为何有些能收到,且收得较多;而有的收不到或收得很少呢?仍以“普”文中的例子加以说明。中央二台和四台在上海闭路电视增补台的Z_(35)和Z_4中,现给出上海牌Z237-1A型机,型号为CM7640ES的电子调谐器(下称ET),其调谐电压V_T和接收频道的关系见表1。从表可知,在V_H频段中的12频道(CH)V_T为18V,当接收Z_(35)时,实测电压需27V左右,参见“普”及表1。同样,中央 In 1996, the sixth issue of the publication of “ordinary color TV can also be added to Taiwan,” a (hereinafter referred to as “P” article) received a lot of readers letter, the comprehensive answer is as follows. As we all know, ordinary color TV sets can receive additional television programs, but why some can receive and receive more; and some do not receive or receive very little? Still “general” text examples to illustrate. The central two and four in Shanghai CCTV ZZ (35) and Z_4, is now given Shanghai brand Z237-1A aircraft, model CM7640ES electronic tuner (hereinafter referred to as ET), the tuning voltage V_T and The relationship between receiving channels is shown in Table 1. As can be seen from the table, channel 12 (CH) V_T in the V_H band is 18V, and when receiving Z_ (35), the measured voltage needs to be about 27V, see “General” and Table 1. Again, Central