The reason that you want balanced output is that many, but by no means all, common antennas are balanced antennas. The word balun is a contraction of the phrase “balanced to unbalanced ” the essential function of a balun is to provide a balanced output. Looks like we’ll be peeling some more onions again! So, what does a balun do, and why do I spend my time making my own? Hmm, complicated question. So, the NVIS article posted recently mentioned baluns, and in that article I mentioned that I homebrewed my own baluns and impedance transformers. Take notes, knowledge can never be taken away. Keypounder, as always, does an excellent job explaining the why and how through enabling the aspiring homebrewer. (see why it’s called Balun?) While his article explains the nuts and bolts, in this abstract I’ll state that the effects are improved radiation efficiency (through impedance matching) and cleaning up noise that otherwise would be heard in the receiver coming from a variety of sources. Baluns are most often (but not always) used as dipole centers to match BALanced antennas to UNbalanced feed line. In the second article Keypounder has generously blessed us with, the issue of Baluns are covered.
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