[TowerTalk] 2-el 15/20 meter duobander

[Grant Saviers]

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 at 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 at gmail.com]
> Sent: Tuesday, November 28, 2017 9:36 PM
> To: john at kk9a.com
> Cc: towertalk at 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 at kk9a.com" <john at 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 at contesting.com
>> Subject:    [TowerTalk] 2-el 15/20 meter duobander
>> From:    Tom Osborne <w7why1 at gmail.com>
>> Date:    Mon, 27 Nov 2017 12:58:40 -0800
>> List-post:    <mailto:towertalk at 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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