The center of the system is a 49:1 unun. An unun is like a balun, but while a balun goes from balanced line to an unbalanced antenna, the unun has both sides unbalanced. You can see his ...
The Guanella transformer, which is basically a balun, requires extra isolation as an unun and was discussed in Sec 2.3 of Chapter 2. Besides these two different methods, the transformers can also come ...
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