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以笔者所在的杭州电视接收情况为例,该市有线电视网络为550MHz系统,已传送包括增补频道在内的27套有线节目。一般全频道黑白机只能收看到9套VHF段节目。本人经适当改动,增加少量元件后,可增收到21套节目。具体方法是: 第一步:在机壳内的天线输入接线板上,用2只10pF/1kV瓷片电容分别将VHF接线柱一脚与UHF接线柱一脚相连,这样即可同时收看到9套VHF段内的节目(包括新增收的21频道,中央五台节目)。
Take the author’s case of Hangzhou TV reception as an example. The city’s cable television network is a 550MHz system that has delivered 27 cable programs, including additional channels. General channel black and white machine can only watch 9 VHF segment program. After I have made some changes, I am able to increase the number of programs by adding a few components. The specific method is: The first step: In the case of the antenna input terminal board, with two 10pF / 1kV ceramic capacitors, respectively, one foot UHF terminal and UHF pin connected, so you can see 9 Set of VHF section of the program (including the new income of 21 channels, five central programs).