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有线电视基础知识讲座──第四讲：匹配与反射刘修文（湖南攸县有线台４１２３００）有线电视系统用的同轴电缆，从理论上讲是属于高频传输线。它不仅有自身的电阻，还存在分布电容和分布电感，具有一定的特性阻抗。其特性阻抗是均匀的，国标规定为７５Ｏ。电缆在传输过程...
Lectures on Basics of Cable TV - Lecture 4: Matching and Reflection Liu Xiuwen (Hunan Youxian Cable Station 412300) Coaxial cable used in cable television systems is, in theory, a high-frequency transmission line. It not only has its own resistance, there are distributed capacitors and distributed inductors, with a certain characteristic impedance. The characteristic impedance is uniform, the national standard is 75O. Cable during transmission ...