[TowerTalk] Tips for Modelling swaged antenna tubing sections

[jimlux]

On 9/29/20 10:00 AM, Mark - N5OT wrote:
> Back when I would model stuff all the time (K6STI's YO) I just put in 
> the swaged parts as separate segments that were the correct diameter and 
> length as the swaged parts. That does not really compensate for the tiny 
> bit of transition from larger to smaller, but my segments were chosen 
> arbitrarily to be halfway through that tiny bit of transition (i.e. the 
> combined lengths added up to the actual phisical length of the HyGain 
> part I was modeling.  I figured no matter how inaccurate my method was, 
> 

but does the model actually show much difference? One can get way down 
in the weeds with this - put a tapered segment in that's 1 cm long, etc. 
But if the wavelength is 20 meters, a 1 cm transition is 0.0005 
wavelength.  I'd worry more about numerical instability than model 
accuracy at that point.