RE: Tesla Coil toroid Size

To: tesla-at-pupman-dot-com
Subject: RE: Tesla Coil toroid Size
From: "Thornton, Russ #CSR2000" <ThorntoR-at-rc.pafb.af.mil> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
Date: Mon, 21 Sep 1998 18:22:17 -0600
Approved: terryf-at-verinet-dot-com
Robert,
Accepting the offer to nit-pick may I offer the following comparison.
Assuming that there may be some translative value here, we radar types on
the Eastern Range affectionately call our pulses "bangs".  Although, there
is no official definition, it is understood to be the entire pulse from rise
to fall. Now the fact that they are in the order of microseconds may have
some bearing on why we don't distinguish the full bang from just the rise as
acoustically it's barely even a click. :^)
Now,  I am far from an acoustics expert myself, but if we took a more
related event, lightning.  Does the acoustic bang come from the arc forming
or from it collapsing.  Everything I have read is that the collapsing arc is
what makes the thunder(bang).  


Russ Thornton
Sr. Radar Systems Engineer
CSR 2040, 
Building 989, Rm.  A1-N20
Phone: (407) 494-6430 
Email: thorntor-at-rc.pafb.af.mil



> ----------
> From: 	Tesla List[SMTP:tesla-at-pupman-dot-com]
> Sent: 	Friday, September 18, 1998 5:25 AM
> To: 	tesla-at-pupman-dot-com
> Subject: 	Re: Tesla Coil toroid Size
> 
> Original Poster: "Robert W. Stephens" <rwstephens-at-headwaters-dot-com> 
> 
> Tesla List wrote:
> > 
> > Original Poster: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
> > 
> > Since I have been involved in this discussion, I will make *my*
> > definition of "bang" 200% clear: A bang starts when the gap first
> > conducts and ceases when the gap ceases to conduct. The trace on the
> > oscilloscope makes it abundantly clear that the secondary is doing
> > nothing for most of the time between bangs in a sparking coil. The
> > energy loss will not permit it.
> > 
> > Now, back to coiling...
> > Malcolm
> <snippage>
> 
> Malcolm,
> 
> It appears that your definition of 'bang' and my own differ slightly.  I
> consider the term synonymous with the acoustical event which accompanies
> a spark gap going from a non-conducting to conducting state.  I suspect
> that most of this acoustical 'bang' occurs on the sharp vertical rise of
> current through the gap and much less so after the plasma channel has
> formed and stabilized.  Hence in 'my definition of bang', assuming that
> the sound pressure wave pretty much ends ends after the sharp vertical
> leading edge of gap current conduction occurs, there can still be a
> closed primary oscillatory circuit (ionized gap) processing an
> oscillatory ringdown after the bang.
> 
> Since one purpose of this forum is to pick at the tinyest of technical
> points, I invite comments.  Any ion acoustical wave experts (if that's
> the correct term) out there?
> 
> I guess if a totally encapsulated solid state switch were employed
> instead of a spark gap, we could be talking about a 'click' size.
> Furthermore, the primary inductor definitely creates acoustical output
> from mechanical motion when clobbered by a large electrical pulse!  I've
> also 'heard' T-03 silicon transistors 'sing'.  If you ever get the
> chance to go into an AM radio station's tuning hut at the base of the
> antenna tower and they are crankin' at least 10 kW you will hear
> metallic sounding speech and music coming from the large silver plated
> copper tubing, air cored tuning coils.  It is very etherial.
> 
> Robert W. Stephens
> 
> 

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