[TowerTalk] Modeling Rohn 25G in K6STI's AO

[Lux, Jim]

On 10/23/21 7:38 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 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".
>

A project for a summer student project..