|Subject:||[TowerTalk] Modelling a basic stack|
|From:||Bill Tippett <firstname.lastname@example.org>|
|Date:||Mon, 10 May 2004 07:43:15 -0400|
N4ZR wrote: >This raises a question. I have always had the impression that antennas in an HF stack, even if first optimized in free space at the planned stacking distance, would be de-optimized (is that a word?) once returned to the "above ground" environment, because the ground plane also figures in the performance of each antenna, and the antennas are different distances from it.
Yes, perfectionists would take the optimized model from YO into AO and continue to tweak. When the measured F/R of my stack was very close to what the free-space model predicted, I declared it "good enough" for my needs and put it up. As with many things, there is a point of diminishing returns and it's up to each of us to decide where that is for ourelves. As you well know, HFTA also makes assumptions about point source antennas, but it's "good enough" as is for my needs.
73, Bill W4ZV
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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