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In article ,
Roy Lewallen wrote: Quite a few years ago, there were a couple of articles -- in Ham Radio magazine, I believe --, which addressed that topic. As I recall, the author used an optimization program that allowed the shape to vary. He ended up with elements bent kind of like a gull wing, and considerably longer than a half wavelength -- more like a wavelength if I recall correctly. The gain was substantially more than for a Yagi, but I don't remember how good the F/B ratio was. I believe he did construct and measure some actual antennas. I think you're referring to the Landstorfer-Sacher Yagi design? http://www.cebik.com/eb.html has some information on these. It's something akin to an EDZ (extended double zepp) beam. A 2-meter 3-element L-S Yagi shows gain in the 9.7 dB range, with F/B ratios of 16-23. Interesting design. Not the easiest thing in the world to construct, I suspect. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
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