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Re: Secondary Core[ esoteric materials]
Hello, this is my first post to the list (whee!)
I couldn't help but post this esoteric secondary material for a chuckle or two:
Some time ago, if I remember correctly, I found a website giving a
description
of a pulse-mode TC secondary that someone built in their dorm room by wrapping
wire around a rolled-up rug. Apologies but I have misplaced the site.
-K. McKenzie
Tesla List wrote:
> Original Poster: "ROBERT CRESSLER" <robert.cressler-at-menasha-dot-com>
>
> >>> <Tesla-at-pupman-dot-com> 04/17/00 07:41PM >>>
> Original Poster: "Charles Arruda" <carruda-at-channelseek-dot-com>
>
> >Has anyone tried
> >"unique" materials to wrap their coil on? What effect does
> >having an outside covering on the coil (several layers of an
> >insulative plastic? Does it help with shorting or corona?
> Charles,
> I have built a couples secondaries out of
> UHMW-PE-POLYETHYLENE-POLYETHYLENE-POLYETHYLENE (a robust form of HDPE)
> mainly because of availability (ie free) the biggest advantage of using is
> zero H2O absorption and the high dielectric strength (2300v/mil) coupled
> with a low dissipation factor of .0002 at 1khz
> however I have pondered going to some esoteric materials.....such as a
tube of
> G-7 glass fabric/silicone binder--- this stuff is it! .003 dissipation
> factor and 4.2 dielectric constant at 1Mhz +450*f operating
> temp,flame&arc resistance.......
> 6"OD x 1/8w runs about $70-80/ft..........
> after winding I would cover with a Fluorinated Ethylene Propylene (a type
> of Teflon) shrink
> tube roll cover (.02-.03 thk)after recovery dielectric strength of 500v/mil
> dissipation factor
> of .00005 at 1khz (!!)
> yikes! expensive!!(and most likely enhanced performance will be negligible)
> another high end material is cross linked polystyrene-sold under the
> rexolite trade name
> (also called Q200.5 years ago)
> .0001-.0006 dissipation factor from 1Mhz to 10GHz dielectric constant 2.5
> thru to 500GHz
> low H2O absorption... the works.... cost unknown but I can guess.
> ref:www.acculam-dot-com
> www.rexolite-dot-com
> www.portplastics-dot-com
> www.interstateplastics-dot-com
>
> regards
> Robert