Re: Fundemental Mode?

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

Original poster: "Shaun Epp by way of Terry Fritz <twftesla-at-qwest-dot-net>" <scepp-at-mts-dot-net>

Jake,

Fundamental mode is just another way of saying resonance, I believe.  It's
used to describe antennas, waveguides and laser cavities.  Basically the
tesla coil is operating as a 1/4 wave antenna where by antenna theory would
say that the voltage minimum is at the grounded end of the coil and the
voltage maximum is at the Hv terminal end.  On my first tesla coil, I had it
severly over coupled and what that caused was a voltage maximum to appear
~1/3 the way up the coil and also at the top, HV terminal end also.  It was
funny because when I had it running, I would get small purpley blue
streamers about 2-3" coming off the side of the coil and they would slowly
melt away the candle wax I used to insulate it.   Running a secondary at a
harmonic frequency in theory will reduce the power output and risk
destroying the secondary due to streamers jumping off the side of the coil.
Running a coil in the higher frequency range  will also cause reduced output
by lowering it's efficiency.  Some of this is theory that I have read in
books and from this list and some is personnel experience when I didn't
really know anything about tesla coils

BTW  don't use candle wax, if it gets cold once, then it breaks off the
coil.
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, December 30, 2001 11:25 PM
Subject: Fundemental Mode?


> Original poster: "Jake Draper by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<cybermecium2-at-home-dot-com>
>
> I heard the term "fundemental mode" used to describe the operation of a
Tesla
> Coil in the "electrocution experiences" thread and I am wondering what
that
> means, and why it is supposedly more dangerous. Is it where the secondary
is
> directly coupled to the primary?
>
> -Jake D.
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