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I see that most of your questions about inverted L antennas have been
answered. The questions you asked (quoted below) illustrate the danger of trying to oversimplify antenna operation. For example, the problem with the "inductor at the top of the vertical" is simply that the horizontal leg isn't just an "inductor at the top of the vertical". If you consider it one, you end up with dilemmas like you've encountered. Likewise, dividing wires into two separate and distinct classes of "phasing lines" and "radiators" gives you no room for wires which do both simultaneously (let alone deal with "phasing lines" whose phase shift doesn't equal the electrical length of the line, which often happens). You'll have to develop a more basic understanding of antenna operation, and avoid trying to pigeonhole antenna characteristics into a convenient handful of categories, if you're ever to have antennas make sense and cease being "voodoo". The EZNEC demo is a way many people have found to help learn what's going on. If you do download the demo, be sure to go through the "Test Drive" tutorial to get started. If you don't find EZNEC to be your cup of tea, there are now a number of free antenna analysis programs available, and you'll probably find one that's to your liking. Roy Lewallen, W7EL nbr wrote: Thanks for the recent comments on my previous post. They have been interesting and informative. The "antenna voodoo" is still bothering me about the theory of some of these antennas (e.g. inverted-L, half-square, etc.). I understand that the horizontal leg of the "L" is considered an "inductor at the top of the vertical" element, but why not the reverse? Why is this not a "bent horizontal" with segments which radiate both in the horizontal and vertical planes? Why is the horizontal sengment of a 1/2-square considered a "phasing line" and not a radiator? 73 Dan (K0DAN) |
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