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Re: Weird ideas


From: 	John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
Sent: 	Saturday, December 06, 1997 6:02 PM
To: 	Tesla List
Subject: 	Re: Weird ideas

At 03:16 AM 12/5/97 +0000, you wrote:
>
>From: 	Edward V. Phillips[SMTP:ed-at-alumni.caltech.edu]
>Sent: 	Thursday, December 04, 1997 11:39 AM
>To: 	tesla-at-pupman-dot-com
>Subject: 	RE: Weird ideas
>
>"  Ed -
>
>  What are the wallplug efficiencies including filament losses and connected
>as Tesla coils. How would these systems compare with Tesla coils with the
>same wallplug input ?
>
>  John Couture"
>	
>
>John:
>	Not quite sure I understand your question.  If you mean the
>efficiency of one of those transmitters (operating at the correct
>frequency, of course) driving the primary of a TC, I would think
>the efficiency would be as high or higher, since there is no
>requirement for amplitude modulation and its attendant input power.
>I suspect the conversion efficiency of a spark-excited TC is quite
>a bit less, based on the heating of the primary gap.  I don't
>believe efficiency in "transformation" of primary input to secondary
>output (into the streamers) means much, because of the heavy 
>loading of the secondary by the streamers.  That means, by the
>way, that I think the emphasis on secondary Q is probably misplaced.....
>Ed

------------------------------------------------------

  Ed -

  With the present method of rating a Tesla coil I admit that it is
difficult to understand what a person means by Tesla coil efficiency.
Efficiency is a ratio of energy out divided by energy in. With sparks the
energy out is difficult or impossible to determine.

  What I meant was when using a certain wallplug input to a tube type TC
would you get a longer or shorter controlled spark length compared to a
classical TC using the same wallplug input ? A controlled spark length being
a horizontal continuous spark from the secondary terminal to a ground point,
using standard air corrections if necessary. This type of rating leaves a
lot to be desired but is the simplest and makes good sense from a scientific
standpoint compared to the rare extra long spark normally used.

  John Couture