From: Sulaiman Abdullah [SMTP:sulabd-at-hotmail-dot-com]
Sent: Thursday, June 11, 1998 8:00 AM
Subject: Re: Inhaling Epoxy!
Hi, my $0.02 cents..... consider polyuretane varnish/resin
instead of epoxy, much cheaper and may be as good.
How will you prevent the natural tendency for narrowing
near the centre?
bye ..... Sulaiman
>Subject: Inhaling Epoxy!
>Hello to all,
I'm planning on constructing my own secondary coil form.
This is how:
First cut out two disks from a piece of ply wood.
Separate them with braces such that the disks appear to be two end caps
of a cylinder.
Take a thin cotton sheet and stretch it between the two end caps such
that the sheet appears to be the sides of the cylinder.
Next, coat the sheet with epoxy and let cure.
wrap on the wire and coat with another layer of epoxy.
Cut coil from wooden disks and finish of with cotton sheet / and
epoxy for the end caps.
> 1) Secondary can be made to any dimensions one chooses.
> 2) Epoxy has strong dielectric strength.
> 3) Coil walls can be made thin.
> 4) Epoxy has very low dissipation factor to RF currents.
> 5) Epoxy is nearly impervious to water moisture.
> 6) Epoxy cures hard yet will not crack.
> 7) Left over epoxy can be used to insulate / adhere other parts of
> the T.C.
> 1) Expensive.
> 2) Labor intensive.
> My question to the group is this: Where might I find a low viscous
>epoxy with good electrical characteristics?
> Thanks in advance,
> Bert S.
>p.s. Why do we use the Earth as ground?
> Because, it's the biggest thing closest to us.