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Re: [TowerTalk] Antenna Modeling

To: jim@audiosystemsgroup.com
Subject: Re: [TowerTalk] Antenna Modeling
From: Bruce Jungwirth <k0son@frontiernet.net>
Date: Wed, 11 Jul 2018 14:42:01 -0500
List-post: <mailto:towertalk@contesting.com>
Thanks Jim. I’ll look at your pdf’s. Actually I would like to learn EZNEC, but 
for now I’m looking at two similar antennas. Both would be 210 ft , center fed 
with ladder line to a balun then ~25 ft of LMR400 to a Ten-Tec 238 tuner. One 
antenna uses any convenient length, (min 40 ft) of 450 ohm Ladder line to a 4:1 
balun. The other is the DX Engineering DXE-WA-260 160-10 Meters Multi- Band 
Dipole kit. They recommend using 60.1ft, or odd multiple there of, of 300ohm 
ladder line to a 1:1 balun. I know both will be NVIS, I’m just trying to 
determine which would be the better choice. 

Sent from my iPad

> On Jul 11, 2018, at 2:12 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
> 
>> On 7/11/2018 10:52 AM, Bruce Jungwirth wrote:
>> I’m looking for someone in or around St Paul Mn that is fluent in EZNEC.
> 
> A principal value of EZNEC and other modeling software is as a teaching tool, 
> and you only learn from it when YOU do it. It's not all that difficult to 
> learn once you get over the fear factor. The free version that comes with the 
> ARRL Antenna Book will model simple antennas like you're thinking about.
> 
> Here are several studies I've done to help think about problems like yours.
> 
> http://k9yc.com/VertOrHorizontal-Slides.pdf
> 
> http://k9yc.com/VerticalHeight.pdf
> 
> http://k9yc.com/43FtVertical.pdf
> 
> http://k9yc.com/AntennaPlanning.pdf
> 
> I am a big fan of fan dipoles. A good rule is to not try to put more than 
> three elements in the fan.  80/40 makes a good fan, so does 20/15/10. 
> Although I haven't done it, i suspect that 30/17 would too.
> 
> 73, Jim K9YC
> 
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