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Re: First Coil Works --Tuning Help
Adam,
Just a quick comment regarding a program to calculate primary tune point. I
would recommend Ed Sonderman's Excel spreadsheet at www.pupman-dot-com. Your
basically just tuning to the required inductance, and spreadsheets are great
for changing a value here and there until you hit your calculated inductance
(in this case). It will give you a good starting point. You'll still have to
use a trial and error method to find the actual tune point regardless, but
you'll be close.
Bart
Tesla List wrote:
> Original Poster: "Adam Parker" <park_e_r-at-hiwaay-dot-net>
>
> Thanks alot for everyones' help. I've learned quite a bit now about how
> these coils get in tune, and what to look for. With your help, I've
> calculated some data.
>
> My primary capacitance is very close to 0.0123 uf . Now, according to
> several programs I've run, my tank circiut will need a capacitance of about
> 0.0212 uf. Soon I'll add another cap to the tank. (salt water,
> unfortunately.)
> My secondary resonates at 295kHz unloaded. But I've yet to find a program
> to give me an idea on where to tap out the 13 turn priamary to achieve
> resonance. Any Ideas? I have a 4.5" by 22" toroid which should lower this
> frequency considerably.
> The space between the edge of each turn is 7/16 of an inch. This makes the
> physical size of the coil rather large. I'm wondering if this might
> adversely effect performance.
> I'm also going to build a nice multiple air cooled gap. I have eleven
> polished copper electrodes at my disposal which makes ten gaps. I'll go
> with Ed's advice for gap spacing.
> Finally, I'll build some chokes and place a safety gap across the noens. So
> far I haven't had to pay a cent for my transformers. I'll try to keep it
> like that for a while.
>
> Thanks alot to everyone one the list who helps us novices,
>
> Adam
> p.s. Chris mentioned using 2L soda bottle caps. This sounds like a pretty
> good idea. Does anyone know how they handle the RF?