There are two general classes of baluns: the voltage balun and the current balun. Because of the high impedance of the winding, the balanced output terminals are isolated from the unbalanced input terminals. Transmission line transformers are formed by winding bifilar turns, multifilar turns, coaxial cable, or strip-line cable (two strips of flat conductor with a dielectric material between the strips) on a core having high permeability1. The balun belongs to a class of devices known as “transmission line transformers”. The shield side of the cable is usually grounded. To the Ham this usually means connecting a balanced load such as a dipole antenna to an unbalanced input such as 50 ohm coaxial cable. The term balun is an acronym for balanced-to-unbalanced. In later articles I will talk further about how to use baluns, balun construction, balun performance, and power ratings. In this first article I will describe baluns and a little about using them. So, I decided to write this series of short articles. Recently I was thumbing through my files on baluns and realized that over the years I had collected a wealth of information that could be of use to fellow Hams.
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