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On Tue, 11 May 2004 11:59:10 +0200, Jan Van Belle
wrote: Hello all, The last days I was searching for more info o how to build fratal antennas on the web. But besides lots of links to fractenna.com and a few powerpoint slides I found nothing. Has anyone sucessfully build such an antenna for HF? Is anyone using it? Kind regards, Jan, ON5DOA Hi Jan, The reason you see such a void of examples is because of your very question: who has built one? This question above is the one that follows: which one to build? And this question above is the one that follows: what limitations do I have? or: what qualities do I want? Your question is raised here on sporadic occasions, and the poster NEVER returns to report a successful outcome. This is not due to lack of information. For such (the largest compilation in the world) visit: http://www.qsl.net/kb7qhc/antenna/fractal/index.htm You should immediately notice that the first impediment is found in the very nature of fractal shapes. Do you want gain? Seems not, you do not describe having a large enough space to do that. Do you want multi banded resonances in a small space? Probably, but you will find very, very few examples worth the effort (frankly none). In all likelihood you would need a tuner, and if you had a tuner, you should skip the complication of this academic trash. In open competition between an Amateur and the professional fractal builder, the professional lost against 6 designs that trounced the best professional fractal on the basis of gain for the smallest footprint. That is to say, all seven antennas were bound within a prescribed "small" area (such as you describe), and the fractal came in dead last. 73's Richard Clark, KB7QHC |
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Richard Clark wrote:
In open competition between an Amateur and the professional fractal builder, the professional lost against 6 designs that trounced the best professional fractal on the basis of gain for the smallest footprint. That is to say, all seven antennas were bound within a prescribed "small" area (such as you describe), and the fractal came in dead last. 73's Richard Clark, KB7QHC Sorry, I've had a little accident while sporting and since I've only a quick connection at the QRL, I couldn't check my mail and this newsgroup. OK, thanx for the explanation. It seems I can leave it now! I thought it would be a nice solution: a big amount of wire on a small area. But if performance is even lower as other antennas and I can only come out on QRP (I've got an FT-817) it is probably not the thing to choose for in first instance. Thanks all for the replies, links, etc. !! 73's de Jan, ON5DOA |
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