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Re: mini coil

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi.

For disruptive coils, any type of "plastic stuff" should work just fine. Cardboard "sono tube" may decrease spark length about 5% due to RF losses especially if it is humid. It may be like 100X worse than any plastic but still not too bad really.

The choice of plastics may be a bit more critical with a continuous wave coil where RF losses my contribute much more to heating. You can simply put a chunk of the material in a microwave oven to see if it heats up excessively. That is a very good test for RF losses!!

Thin wall tubing can sometimes warp into an oval shape so you do not want to get it too thin.

Be sure to avoid black plastics since they may contain carbon black which will short out the secondary coil and will literally burn it up!! There are some ABS plastics that are black but perfectly fine. They are very shiny and will not mark paper rubbed on it. If the black plastic leaves a "pencil mark" on paper, it is very bad!

All the green or white sewer and water pipes are fine. You may want to clean off any ink writing and sand and clean the surface to really get it clean and smooth. All clear plastics are fine with the exception of some thin metal or conductive coated plastics used to fight static build up but those are very rare.

Cheers,

        Terry



At 05:01 PM 12/29/2004, you wrote: 
Considering that the Q of the primary circuit is many magnitudes lower than
the secondary Q, the type or thickness of PVC will not make much
difference at all.

I'd like to know how you quantify your experience, performance vs. various
wall thickness type PVC.

Dan


> Claude,
>
> My experience has been that all types of pvc will absorb some RF
> energy so a thinner wall tubing of the same diameter will increase
> your performance.
>
> Phil
> TCBFW
>
>
> On Wed, 29 Dec 2004 09:04:29 -0700, Tesla list <tesla@xxxxxxxxxx> wrote:
>  > Original poster: "claudio masetto" <claudmas@xxxxxxxxxxxxxxx>
>  >
>  > I am thinking of making a mini coil with a secondary of 2.375" x 12"
pvc
>  > pipe. It has a fairly thick wall of about 3/16". Would it make much of
a
>  > difference in performance if I use a thinner wall pvc pipe.
>  >
>  > Thanks
>  > Claude.
>  >
>  >
>
>
>
>
>