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

[Jim Brown]

On 10/23/2021 4:48 AM, Mark - N5OT wrote:
> Hey youall,
> 
> I want to model Rohn 25G as a transmitting antenna.  Has anyone learned 
> how to do that fairly accurately in K6STI's AO program? In addition to 
> some length of regular straight sections, my tower has a factory 8' 
> tapered top section which I would extend with a 2" stinger and a 
> single-point pier base that is basically a 10 foot section with 3 feet 
> of taper to a flange added.  It appears to be "factory" although I have 
> never seen one in person and it could be a one-off.
> 
> 1. How do I model these tapers?

I've never seen AO, but in EZNEC it's pretty easy.
> 
> 2. How do I model the tower itself?  Do I call it "10-inch diameter 
> steel?"  Larger?  Smaller?

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.

73, Jim K9YC