Re: Secondary coil form questions

To: tesla-at-pupman-dot-com
Subject: Re: Secondary coil form questions
From: roderick maxwell <major-at-vicksburg-dot-com>
Date: Wed, 12 Feb 1997 20:51:17 -0800
Subscriber: major-at-vicksburg-dot-com Wed Feb 12 23:04:20 1997
Tesla List wrote:
> 
> > Subject: Re: Secondary coil form questions
> 
> Subscriber: bert.hickman-at-aquila-dot-com Tue Feb 11 23:18:03 1997
> Date: Tue, 11 Feb 1997 12:38:47 -0800
> From: Bert Hickman <bert.hickman-at-aquila-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Secondary coil form questions
> 
> Tesla List wrote:
> >
> > Subscriber: ccrochet-at-premier-dot-net Mon Feb 10 21:37:34 1997
> > Date: Sat, 8 Feb 1997 09:29:15 -0600
> > From: Chris Crochet <ccrochet-at-premier-dot-net>
> > To: tesla-at-pupman-dot-com
> > Subject: Re: Secondary coil form questions
> >
> > At 11:25 PM 2/7/97 -0700, you wrote:
> > >Chris,
> > >
> > >One of the highest Q coils I ever wound was on 4" diameter styrene with a
> > >.030 wall thickness.  I never coat my coils with anything any more.
> > >
> > >Yes, make them thin walled tubes from the lossest loss material possible.
> > >Avoid coating, if possible.  This assures highest Q!...  If that is what you
> > >are after!
> > >
> > >Richard Hull, TCBOR
> >
> > Thanks!  I will consider the use of styrene in my 1st design.
> >
> > Is there anywhere a database or program which would show the theoretical 'Q'
> > of the same secondary wrapped on many different types of plastic coil forms?
> >
> > Chris C.
> 
> Chris,
> 
> Not that I'm aware of. However, as long as you pre-treat the PVC by
> drying it and coating the inside and outside with polyurethane, your
> coil's performance will be excellent. ABS, polystyrene, HDPE,
> Polycarbonate (Lexan), Polypropylene, PMMA (Plexiglas), or glass-epoxy
> coilforms can be used as-is with no pretreatment required. Stay away
> from cardboard - it won't withstand the voltage levels.
> 
> Q is governed more by the wire size, form-factor (height versus
> diameter), and operating frequency than by the material used for the
> coilform itself.
> 
> -- Bert H --


  Does anyone know of any companies that sell polystyrene tubing larger
than four inches in diameter? My first coil has a styrene secondary and
I really like its performance.For my next project I'm going to build a
smaller coil that will resonate at about 1Mhz. But in the future when I
get more space to build and operate my coils I would like To build A
MONSTER! I like the fact that styrene has such low losses in the RF
range, it is hard, rigid, tough, and coatings stick to it well. The the
only problem is I can't find any in a large enough diameter. If anyone
knows of such a company the information will be greatly appreciated!

                      

                                Frankensteins Helper
                                       Max