RE: PVC w/ H2O

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hello,

Somewhere in the archives is a loss table for different types of coil forms.
I think maybe Richard Quick compiled them. I any case, PVC does become
pretty lossey in the high freq spectrum. My coil forms are coated 1/8" PVC.
I think the process of coating with polyurethane helps lesson the amount of
loss as well.

Polystyrene is very cheap for smallish coils and is very low loss if you are
in the high frequencies. I have a 4" form of this type for my future VTTC.

Regards and big Sparks,
Jim Mora


-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Friday, January 12, 2007 11:31 PM
To: tesla@xxxxxxxxxx
Subject: Re: PVC w/ H2O

Original poster: Mike <megavolts61@xxxxxxxxx>

Gomez said:
Nothing has yet convinced me that PVC's lossiness is significant at
Tesla coil frequencies, esp. if thin-walled material is used.

I can't argue that a bit, but then again  you and I wind coils in a
semi arid area.    I doubt we'd notice if water made a difference.
Mike



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