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Re: Information Unlimited BTC30 coil

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Jay,

You may want to aquaint yourself with JAVATC located at:


One of the best design tools available

Gerry R.

Original poster: jhowson4@xxxxxxxxxxx

Oh yea I'm Jay by the way             hey that rhymes

Well he did not buy the kit you see. It was left in the closet thing from the previous teacher and he did not know what to do with it so he stuffed it back in the closet then I found it and asked if I could have it so after thinking it over for like a month he gave it to me. YAY

The secondary has a 3.5in diameter and the wire section is 9.75in tall and has 24 gauge wire. I made the primary but it is weird. There is a big hole with 6 turns of 12gauge wire that are bunched together then that wire goes into 4 turns of small copper tubing.
How do I calculate the inductance for that?
I did not trim the copper tubing yet I will do that after I am done I guess.
The RF filter is 24 turns of 24 gauge wire

I put together the spark gap, capacitor and the weird case thing.

-------------- Original message --------------
From: "Tesla list" <tesla@xxxxxxxxxx>

> Original poster: Mike
> I don't know your name, but hi.
> It was cool of your teacher to give you this kit to
> build. It sort of detracts from your education on the design
> aspect, but hey....if he is willing to fork out too much $$ (based on
> my awesome scavenging skills lol) to further your education....I'm
> all for it. There's no substitute for winding your own
> secondaries...and I'd replace that filter choke with a 'Terry filter'
> as soon as you can. Another improvement would be to add an
> additional spark gap or two.....AFTER you get it going. Just that
> for a static gap system, a few gaps in series will quench
> better. You didn't mention the wire guage used on t he sec ondary,
> so I will have to make some assumptions for the moment. It would
> seem that there is a possibility of tweaking this system......but
> build it as is for now.
> Original poster: jhowson4@xxxxxxxxxxx
> Hello All
> 2nd day back to school and I am still on break.=)
> My Physics teacher gave me the BTC3 kit today. YAY
> So here are pictures of what it comes with.
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