Gawd I got so educated over the weekend. That was great.
I put up 50 feet of tower, a 12 foot mast, and two 70' long top load
wires. Tuned out the SWR at the shack with a matching network.
Stations heard me well, I thought. Worked Great Britain from Oklahoma,
etc. More data for the cruncher.
I still think traps are elegant, but the most practical solution at N5OT
is to keep it simple and put up a different vertical for 80 meters in
another part of the yard.
Thanks everybody for all the great comments.
73 - Mark N5OT
On 10/24/2021 1:50 PM, Dan Maguire wrote:
Hi Mark,
Those models are some of the most complex I've ever created. I'm not
sure I could do it again if my life depended on it!
Dan
On Sunday, October 24, 2021, 04:38:31 AM PDT, Mark - N5OT
<r-emails@n5ot.com> wrote:
Thanks, Dan. I got buried in your content for about an hour and it
was excellent.
Mark
On 10/23/2021 9:38 PM, Dan Maguire wrote:
Jim Brown wrote:
I've seen a simple equation for modeling a straight triangular tower in NEC. As
I recall, the diameter worked out to be around 0.65 the width of a side. This
would account for modeling it as a radiator.
The image just below "Wire Geometry" on pagehttps://ac6la.com/aecollection8.html
<https://ac6la.com/aecollection8.html>shows the equivalent diameter for Rohn 25G according to:a) Section 9.1 of Leeson's
"Physical Design of Yagi Antennas" EquivDia = SQRT(Area / PI) + Perimeter / (2*PI) = 9.55 inchesb) Wikipedia
pagehttps://en.wikipedia.org/wiki/Antenna_equivalent_radius <https://en.wikipedia.org/wiki/Antenna_equivalent_radius>
EquivDia = 2 * (LegDia/2 * FaceWidth^2)^(1/3) = 8.58 inchesI'm afraid I don't know which is "more correct".Dan,
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