[TowerTalk] Force 12 loading coils

[Robert Harmon]

Stan,

Thanks for the addr for the coil calc.
Yeah it looks like they got their act together with the Tornado's

thanks Stan,
Bob
K6UJ


On 1/3/16 11:14 PM, Stan Stockton wrote:
> Bob,
>
> The Tornado coil is a motorized inductor that compresses or expands the coil to change inductance.  It was developed by Seco-Systems, not N6BT.  They are heavy and expensive but cool.
>
> To the best of my knowledge anyone can buy those from Mike at Seco-Systems.  I know Force 12 has bought them in past for center loading on big low band dipoles or verticals.
>
> The larger air wound coils with Delrin on each side may approach the properties you would see using the Hamwaves inductance calculator.
>
> http://hamwaves.com/antennas/inductance.html
>
> Wish they would add option for inches :-)
>
> Hope this helps in some way.
>
> 73... Stan, K5GO
>
>> On Jan 3, 2016, at 12:23 PM, Robert Harmon <k6uj at pacbell.net> wrote:
>>
>> 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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