Re: Cooking with the primary

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Given the very long wavelength of TC emissions, compared to
cellphones/microwave ovens/radars, the nature of the RF power dissipation is
going to be somewhat different.  In the higher frequency case, radiated
fields get absorbed (and, fairly quickly), so things like antenna/head
geometry are important.  At the lower frequencies, you're probably more
worried about being part of an RF circuit, and having RF currents heat up
some part of your body (i.e. very localized, as in a burn, or generalized,
as in the well documented ankle/wrist symptoms ).  Skin depth at TC
frequencies, in a human body, is much greater than the thickness of the
body, so it's sort of a bulk conduction effect.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, August 15, 2003 11:51 AM
Subject: Re: Cooking with the primary


 > Original poster: "Laurence Davis by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <meknar-at-hotmail-dot-com>
 >
 > doesnt path loss, err... rf dissipation factor have a play here?
 > 100 watts at 200khz is far more desirable then 100 watts at 1ghz (or even
 > 2.4ghz :)
 > hmmm....  whats the rf dissipation factor of brain matter?
 >
 > larry.
 >
 >
 > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >To: tesla-at-pupman-dot-com
 > >Subject: Re: Cooking with the primary
 > >Date: Fri, 15 Aug 2003 08:00:02 -0600
 > >
 > >Original poster: "Paul Marshall by way of Terry Fritz
 > ><teslalist-at-qwest-dot-net>" <klugmann-at-hotmail-dot-com>
 > >
 > >My thoughts on this are "If a cell phone transmission may cause brain
 > >cancer, what are these CW coils doing to us" ?
 > >
 > >
 > >
 > >Paul S. Marshall
 > >
 > >
 > >
 > >
 > >
 > >>From: "Tesla list" <tesla-at-pupman-dot-com>
 > >>To: tesla-at-pupman-dot-com
 > >>Subject: Re: Cooking with the primary
 > >>Date: Thu, 14 Aug 2003 06:54:36 -0600
 > >>
 > >>Original poster: "sebastian gaeta by way of Terry Fritz
 > >><teslalist-at-qwest-dot-net>" <sgtporky-at-prodigy-dot-net>
 > >>
 > >>Hi,
 > >>
 > >>I did a bit of accidental cooking with my 304TL coil. I used too large
of
 > >>a topload, and too large of a tank cap. The large tank cap caused me to
 > >>use too few primary turns which causes a larger RF current to flow.
 > >>According to Bert H. too large of a toroid also caused some large
 > >>circulating currents to flow.This all added up to trouble, and caused
the
 > >>bottom bolt on the secondary to get so hot that it melted the solder
 > >>connection. My wooden support burned all along where the bolt, and
ground
 > >>strap contacted it.
 > >>
 > >>Continuous wave coils are much better at cooking than spark gap systems
 > >>by the way.
 > >>
 > >>Please be careful. When there is no secondary, and sparks to dissipate
 > >>the energy, you are going to have lots more RF floating around, which
can
 > >>be nasty if you are wearing jewlery, and harmful to other electronic
 > >>devices nearby. You will also get an RF burn off of practically every
 > >>thing conductive that you touch, whether it is grounded or not. If your
 > >>OFF switch is metal like mine was, use a plasic rod or something to flip
 > >>it off with. If you absolutely need to touch something metal while the
 > >>coil is running you will need to equalise your RF potential by bonding
to
 > >>it with a metal object that is already in your hand like a key or
 > >>something before you can touch it with your bare skin. When you wish to
 > >>draw your hand away, you will have to make contact with the key first
 > >>before you break electrical contact with your skin, otherwise you will
 > >>draw an arc and get an RF burn. This all sounds very bizzare, but
welcome
 > >>to the world of high powered radio!
 > >>
 > >>Have fun, and play safe,
 > >>Sue
 > >>
 > >>Tesla list <tesla-at-pupman-dot-com> wrote:
 > >>Original poster: "John by way of Terry Fritz "
 > >>
 > >>Hello,
 > >>I came up with an idea after looking at induction heaters on the
Internet.
 > >>I was wondering if one could remove the secondary coil from the middle
of
 > >>the primary and instead place something to be cooked. At high enough
 > >>frequencies this should work.
 > >>
 > >>John
 >
 >
 >