I have EZNEC5 and it delivers large errors with cages.
On 9/26/09 1:10 AM, "Bob Kupps" <firstname.lastname@example.org> wrote:
> EZNEC 5. Regardless of my inability to model I would be interested in any
> practical solutions that have already been tried and known to work.
> Thanks 73
> --- On Sat, 9/26/09, W2XJ <email@example.com> wrote:
>> From: W2XJ <firstname.lastname@example.org>
>> Subject: Re: Topband: electrically shortening a tall grounded tower
>> To: "Bob Kupps" <email@example.com>, "topband" <firstname.lastname@example.org>
>> Date: Saturday, September 26, 2009, 11:56 AM
>> What software are you using? Often modeling software can not handle cages.
>> On 9/25/09 11:50 PM, "Bob Kupps" <email@example.com
>> </firstname.lastname@example.org> > wrote:
>>> > Hi
>>> > Is there any effective way to electrically shorten a tall grounded tower
>>> > 1/4 wave? I tried modeling a 1/4 wave cage surrounding the tower but it
>>> > shows a lot of current in the protruding section with resulting high angle
>>> > radiation. Then I tried modeling a 1/4 wave stub above the cage grounded
>>> > the top to the central tower which appeared to turn it into a dipole and
>>> > significant current above the stub. I was also thinking of using an
>>> > parallel resonant trap/choke but would this actually work when situated at
>>> > zero current point at the far end of a 1/4 wave monopole?
>>> > Thanks and 73 Bob N6BK/HS0ZIA
>>> > _______________________________________________
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