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On Sat, 17 Apr 2010 05:06:42 -0700 (PDT), WA2SI
wrote: Visualize, if you will, two wire Christmas tree shaped wire loops, 90 degrees from one another, fed at the center of their bottom legs up abt 30'. Hi Bert, This is the design of Bellini and Tosi of 105 years ago. They fed it through a goniometer so they could steer the beam angle. At the time they were unconcerned with load Z as you could tune the final and drive to accomodate that. Some might say, "why not just mount a vertical?" Well, I have the 2:1 balun and I figured that the loop would be much quieter. I'm not sure how you have come up with, or plan to come up with a 2:1 BalUn - not very common, and construction details may ruin expectations for performance. As for "quieter," that is a very common myth = t'ain't so. As for other details, you only roughly describe the length of wire involved (in only one dimension) and you say nothing of frequency - except by inference in the 80M band. Such details impact Z considerably if you want someone to supply you with that characteristic. 73's Richard Clark, KB7QHC |
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