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Re: Cooking with the primary



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

Check back through the archives for the threads on RF safety...

Short answer, CW coils are a potential hazard from thermal and shock
effects. No epidemiological evidence for carcinogenicity from high level RF
fields in these frequencies (or any frequency, actually), just acute
injuries (burns, cooking, etc.)

Indeed, though, this is something that anyone working with high power RF
(>100W) should be aware of.  Don't look into open waveguide with your
remaining good eye, for instance.  Deep RF burns are painless when occurring
and painful later, and heal slowly to boot.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, August 15, 2003 7:00 AM
Subject: Re: Cooking with the primary


 > 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
 > >
 > >