There are a number of performance parameter choices for optimizing -
gain, swr, & F/R are the 3 most useful for me of the 6 possible, over a
range of frequencies of your choosing and weighting factors re how
important each one is for you. Of course they all interact so some
judgement is needed in what you ask the optimizer to do. There isn't
much to optimize with only 2 elements but I think with any interlaced
design AutoEZ is a must. It is amazing what designers achieved on
multiband designs before Dan produced this tool.
I've noticed with 5 and 6 element designs I've done, that once 50 ohms
is specified as the feedpoint Z, OWA looking designs seem to pop right
out of the optimizer.
Grant KZ1W
On 11/28/2017 18:43 PM, john@kk9a.com wrote:
Can it optimize for a specific impedance? In other words can it design an
OWA?
John KK9A
-----Original Message-----
From: Stan Stockton [mailto:wa5rtg@gmail.com]
Sent: Tuesday, November 28, 2017 9:36 PM
To: john@kk9a.com
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] 2-el 15/20 meter duobander
Anther reason to own AutoEZ. It can design a duo bander for you in about
ten minutes.
Stan, K5GO
On Nov 28, 2017, at 7:18 AM, "john@kk9a.com" <john@kk9a.com> wrote:
I played modeling 2el dual banders a long time ago and I recall having
success just putting the higher frequency Yagi in-between the elements
of the lower frequency Yagi. It is easy to model and see what happens.
Adding more elements and more bands really complicates things, kudos
to the designers of the excellent multiband interlaced beams.
John KK9A
To: towertalk@contesting.com
Subject: [TowerTalk] 2-el 15/20 meter duobander
From: Tom Osborne <w7why1@gmail.com>
Date: Mon, 27 Nov 2017 12:58:40 -0800
List-post: <mailto:towertalk@contesting.com>
Hi all
I have a HB 2-el 20 meter monobander on a 16 foot boom. I would like
to add 15 meters to this antenna, but can't find any diagrams anywhere
for such an animal. Googled it but no joy.
Does anyone know of a good setup for 20 and 15 on the same boom
without interaction to each other?? Thanks and 73 Tom W7WHY
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