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@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@contesting.com
Subject: [TowerTalk] Force 12 loading coils
From: Robert Harmon <k6uj@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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