[TowerTalk] 2-el 15/20 meter duobander

[john nistico]

I have the opposite trouble. The larger interlaced antennas are very common. But in a case where space is an issue a nice 2 element 15/20 would be nice

Sent from my iPhone

> On Nov 29, 2017, at 8:01 AM, "john at kk9a.com" <john at kk9a.com> wrote:
> 
> 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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>>> 
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>> 
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