[TowerTalk] 2-el 15/20 meter duobander

[john at kk9a.com]

AutoEZ appears to be like AO/YO on steroids and it is pretty inexpensive. I
wish that the product was around when I designed my antenna farm. I concur,
it is really amazing what designers achieved by simply manually changing
element lengths and spacing.  I have used the manual method for smaller OWA
beams but I had no success designing larger multiband beams.

John KK9A

Sent via the Samsung Galaxy 7 edge, an AT&T 4G LTE smartphone.

On Wed, Nov 29, 2017 at 12:10 AM, Grant Saviers <grants2 at pacbell.net> wrote:

> 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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