[TowerTalk] Antenna model

[Wes Attaway (N5WA)]

My son does a lot of antenna design and modeling for commercial spacecraft
antennas, and also other types of antennas, and he swears by 4nec2.  He is
real good with it.

On his last visit here he, just for fun, modeled my two wire antennas that
are strung between trees in the backyard (and cross each other) and he
produced an unbelievable set of charts and graphs, even including a few feet
of a "spiral' where a wire was hanging down at the end of one leg and the
weight to hold it straight down had fallen off.  (We concluded that there
wasn't much difference between the spiral and a straight piece of wire in
that particular spot, at least not enough to worry about).  He whipped all
this out in about an hour or so.

I ended up with more charts and graphs and 3D views than I knew what to do
with.   4nec2 is amazing, and it is free. 

   -------------------
Wes Attaway (N5WA)
(318) 393-3289 - Shreveport, LA
Computer/Cellphone Forensics
AttawayForensics.com
   -------------------
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
jimlux
Sent: Thursday, February 23, 2017 7:21 AM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Antenna model

On 2/23/17 3:55 AM, john at kk9a.com wrote:
> EZNEC is a great tool and fun to use but it sure would be nice if it
> optimized.

This is why 4nec2 is great.  It has a decent optimizer.  I believe AC6LA 
also has AutoEZ which is a front end for EZNEC



  I am not sure what you impedance is. I am sure that you can
> make it direct feed 50 ohms if you can extend the boom a few feet.  This
> makes it very easy to adjust the DE for low SWR.  GL with your project.
>
> John KK9A
>
>
> To:	towertalk <towertalk at contesting.com>
> Subject:	[TowerTalk] Antenna model
> From:	john nistico <electric911inc at hotmail.com>
> Date:	Thu, 23 Feb 2017 01:16:36 +0000
>
> I used eznec to model a small beam for my son who is going for his
general. 2
> element 20 meter yagi on a 10 ft boom the results were pretty good. Any
> suggestions on how to improve? The driven element is 16fy 6 inches per
side
> reflector is +10%
>
> John J. Nistico
> 911 Electric Inc.
> 516.325-8993
>
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