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Re: [Antennaware] 3-element HF yagi design

To: Guy Olinger K2AV <>
Subject: Re: [Antennaware] 3-element HF yagi design
From: David Gould <>
Date: Wed, 25 Jan 2012 20:50:52 +0000
List-post: <">>

Thanks for the information.  (I meant NEC-2 not NEC-3,  and Yes, I 
appreciate EZNEC is not an optimiser.)

Ok there would be some technical issues to resolve,  but the main 
question still remains  -  whether there are any **fundamental 
reasons**  why it is NOT be possible to design a 3-element yagi with 
a frequency independent feed?  I have read a bit about OWA yagis, but 
I have only found reference to ones with 4 or more elements.

Dave, G3UEG

At 20:03 25/01/2012, Guy Olinger K2AV wrote:
>EZNEC is not an optimizing modeler.  So design iterations with the 
>model are manually directed.
>HF yagis from a standing start are best done with YO.  Which, alas, 
>is not being marketed by Brian K6STI any more (unless someone knows 
>something new ??).  Try USPS mail to Brian's address.  I 
>will not expound the long story about how things got to be this way.
>EZNEC (with NEC2 engine) has a limited stepped diameter correction 
>mechanism, which is not part of the NEC2 process.  Its limitations 
>would seem to fit an HF yagi.
>NEC3 was superseded by NEC4, which is licensed from Lawrence 
>Livermore Labs.  See the wikipedia article.  Only NEC2 and NEC4 are 
>available as processing cores.
>73, Guy.
>On Wed, Jan 25, 2012 at 12:55 PM, David Gould 
><<>> wrote:
>I would be interested in whether it is possible to design a 3-element
>HF yagi (with tapered aluminium tubing) that has a frequency
>independent feed.  I am willing to compromise top-notch performance
>for flexibility/simplicity.  My thinking is to feed with a standard
>ratio Balun (eg 50ohm or perhaps 25ohm)
>Does anyone already have a model for any of the HF bands (but 20m
>would be preferred if available) that they would be willing to share?
>I don't know whether I am asking for the impossible here!!
>Second question..  Can I model such an antenna reliably with EZNEC+ 5
>using the NEC 3 engine?   (I have been advised that NEC3 is not good
>enough and NEC4 is really needed.)
>Dave, G3UEG
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