Hi All,
Lack of interference form Tesla coils...
Thinking about it from a "conservation of energy" point of view, most of the
energy must be going into producing heat, light and sound, and ripping
molecules apart to make ozone. So only a fraction of the 3kVA can be being
converted to EM waves.
If you have a "one meter spark" as an antenna, it is not really that
different to having a 1 meter loop antenna, as long as there are not other
long cables acting as radiators. We wouldn't think of a 1m loop antenna as a
very efficient TX aerial at LF ... VHF maybe.
At LF frequencies one would might be in the near field which might have a
bearing on what was received when looking for interference.
73
Hugh M0WYE
----- Original Message -----
From: "Peter Dodd" <[email protected]>
To: <[email protected]>
Sent: Thursday, June 29, 2006 12:44 AM
Subject: Re: LF: LF/HF/VHF Spark?!
Martin Mac Gregor wrote:
The point of this saga...
Latterly we discovered that Industry Canada (DOC) had too become involved
on
an investigative basis; we learned that during our exhibitions, local
broadcasting and even low band TV in the immediate locale was reportedly
obliterated but certainly interfered with.
One weekend, during the early experiments on 136kHz from Amberley museum,
we had a group come and give a demonstration of Tesla coils. I set up a
mobile receiving station that had the ablility to tune from 70 to 180kHz
(the fundemental frequencies of these coils) to see how strong the
electromagnetic radiation from these coils would be. I couldn't receive
anything, even when the mobile receiver was located 200m from a coil
giving off a one metre length spark. I don't think the receiver setup was
that deaf because I could hear the usual commercial and broadcast stations
in the band. These results certainly surprised me - perhaps I should have
looked in the VHF bands.
Peter, G3LDO
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