![]() ![]() The reason being, most antennas (including Yagis which are of interest to us here) are balanced antennas. ![]() The best way to feed most antennas is with a balanced feeder. Coax can be feed through walls, under-ground, up the side of our towers or metal poles without any drastic affect on the Antenna or it's tuning - or does it? So much so, commercial modern day transceivers have an unbalanced output designed to feed and receive directly from coax. It has become commonplace that the Radio Ham or even commercial entities use coax to feed antennas due to the convenience of so doing. However, there are issues that need to be over come when feeding an antenna with coax. It's invention has allowed the feeding of antennas through a manner of different substances, conditions and places the a balanced feed line could not. So why do we need any form of balancing at the feedpoint in any case?Ĭoax is a wonderful thing. These types need the impedance to be transformed in addition to the feedpoint balancing effect. However, other antennas need transforming from 12.5 to 50Ohm up to (and beyond) 200Ohm to 50Ohm. There are many different types of balun and some incorporate impedance transformation too and it is this areas which leads to some confusion.įor 50Ohm direct feed antennas, just a 1:1 balanced to unbalance transformer is needed. ![]() Within this section we will look at the various methods and requirements of a balun in the hope that you will be better placed to make the right choice for your antenna. ![]()
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