A Balanced Balanced Antenna Tuner
A Balanced Balanced Antenna Tuner By Richard L. Measures, AG6K The published version of this article appeared in the February 1990 issue of QST Magazine. This is the pre copy-edited version, updated in May, 2003. ........................ JPG of a remote controlled, balanced L-network tuner built by Mike, WA1SEO. Antenna tuners are like shovels. It takes more than one kind of shovel to be able to efficiently perform a variety of jobs. For example, a snow shovel isn't suitable for digging holes in hard ground. A tiling spade could be used to shovel snow, but it wouldn't be very efficient. Similarly, no single antenna tuner circuit can do everything extremely well. A balanced load tuner should be designed, from the ground up, for the job that it is intended to perform. This article describes a circuit that does a good job of feeding an open-wire transmission line [ladderline]. It is not intended to be used for unbalanced loads such as a coaxial transmission line or for end...