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On Sun, 21 Nov 2004 15:39:31 GMT, "Bert Craig"
wrote: Opinions please. Hi Bert, When I read a testimonial like: In direct comparisons with a G5RV at the same height, I am constantly receiving 3 S-Units better when using the Cobra. I have to wonder about the source. $90 for zipcord? Well, opinion aside, I modeled this (each arm is a single wire, folded back on itself twice) and when I tried to run a SWR sweep in EZNEC from 2MHz to 30MHz in 0.1MHz steps, EZNEC stalled and gave up. I suppose this may have been due to warnings of wires being too close. As it was, I pulled the zip wires apart 1.2" (0.1'). EZNEC wanted a minimum 6". I tried again with 1MHz steps, and the full sweep drew a line across the top of the chart (max SWR). Hoping for more resolution, I tried with 0.2MHz steps, and EZNEC stalled again. Third time is charm (so the saying goes), and with 0.25MHz steps - it stalled again. -sigh- 73's Richard Clark, KB7QHC |