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 page
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 inches
b) Wikipedia page https://en.wikipedia.org/wiki/Antenna_equivalent_radius
EquivDia = 2 * (LegDia/2 * FaceWidth^2)^(1/3) = 8.58 inches
I'm afraid I don't know which is "more correct".
Dan, AC6LA
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|