[TowerTalk] Force 12 loading coils

[Robert Harmon]

John,

I think they use both fixed and adjustable Tornados.  The adjustable
on 80 meter yagis.  I may be wrong but I think that is what they are doing.
Yes I am also glad they no longer use the linear loading wires.  It 
looks like they
got their act together now hihi.

thanks es 73,
Bob
K6UJ

On 1/4/16 6:43 AM, john at kk9a.com wrote:
> When I saw this post I thought that they were using adjustable Tornado
> coils, which would have been really nice to cover both CW and SSB
> segments. However these Tornado coils do not appear to be adjustable. One
> reason that I purchased OptiBeam a decade ago was the nice High-Q loading
> coils. It is nice to see that Force 12 abandoned the linear loading wires.
> The first generation coils appear to have very close spacing, almost
> touching.
>
> John KK9A
>
>
> To:	towertalk at contesting.com
> Subject:	[TowerTalk] Force 12 loading coils
> From:	Robert Harmon <k6uj at pacbell.net>
> Date:	Sun, 3 Jan 2016 10:23:43 -0800
>
> I found this interesting article (below) on the evolution of Force 12's
> current Tornado loading coil design from the beginning with the Tom
> Schiller, N6BT original design to their final Tornado version. I put this
> post on the EHAM antenna reflector but no interest yet. I was surprised
> that in the last part of the article they say that they wont disclose the
> Q of their new Tornado coil. Huh ??? Reading thru the article it indicates
> they went away from Tom's original design to a smaller dia, smaller
> inductor, loading coil design, and now they have gone to their new Tornado
> design which looks very similar to Tom's
> original design. hmmmmmmmm
> I have surmised from this that they developed a piece of #### loading
> coil, then went back to a slight variation, original design, higher Q,
> more efficient coil they named Tornado. It bugs me that they wont divulge
> the Q, my guess is that they dont want us to compare the Q's of the
> loading coil evolution from Tom's original design to the current Tornado.
> I think we know why they dont want us to compare :-)
> Anyway I am trying to figure out the Q of the different coils.
>
> here is the article:
>
> http://www.force12inc.com/content/Application%20Note%20-%2040m%20Delta%20Coils%20Overview%20DRAFT%202.pdf
>
>
>
> 73,
> Bob
> K6UJ
>
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