[TowerTalk] More on Half Wave (and HFTA)

[jimlux]

On 1/19/19 2:24 PM, john at kk9a.com wrote:
> Excellent post Shawn.
> 
> I was concerned about this when W9AC mentioned small height changes making
> big radiation angle differences at W3CRA(sk)
> http://lists.contesting.com/pipermail/towertalk/2019-January/162525.html
> 
> Also I have seen many people use HFTA to optimize stacking heights and it
> does not calculate interaction of close beams properly.

I believe it models them as independent point sources with a specified 
elevation and azimuth pattern with Hpol.

One could, in theory, run a vertical pattern with NEC with both antennas 
(in whatever configurations) in "free space"  and then feed that into 
HFTA (or a HFTA like program) to do the far field pattern.



> 
> John KK9A
> 
> From: Shawn Donley n3ae
> Date: Sat Jan 19 13:17:35 EST 2019
> 
> Since terrain effects have entered the discussion, here's my 2 cents
> (probably less) on the subject.   Like any modeling program, be careful
> interpreting HFTA results.   See my earlier post at:
> 
> 
> http://lists.contesting.com/archives//html/Towertalk/2016-07/msg00350.html
> 
> 
> N3AE
> 
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