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Re: A Puzzle


From: 	DR.RESONANCE[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: 	Tuesday, September 02, 1997 9:30 PM
To: 	Tesla List
Subject: 	Re: A Puzzle

to: Malcolm

A quick suggestion --- measure the distributed capacitance of both
inductors and compare.  The difference in this cap could explain why the
freqs are similar.  Just a thought.

DR.RESONANCE-at-next-wave-dot-net



> From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
> Sent: 	Tuesday, September 02, 1997 6:03 PM
> To: 	tesla-at-pupman-dot-com
> Subject: 	A Puzzle
> 
> Greetings All,
>                This is a genuine enquiry (no, I don't know all the 
> answers regrettably). Last night, I replaced the large resonator in
> my work system with a much smaller one with the same sphere on top.
> I am using the same primary but k would be somewhat different.
> 
>       The large resonator is a 10" x 44" space wound job (Ctot about 
> 26pF). The small resonator is 4" x 17" and with the same topload 
> resonates at exactly the same frequency as the large one. This coil 
> has around 1800 turns of wire one it and consequently its inductance 
> is much higher (which it would have to be to resonate at 146kHz as 
> its Ctot is much less than the larger coil). OK, I know the wire 
> losses are a lot higher in the small one so on to the next bit of 
> information.
> 
>      Under single shot conditions, the spark length is pretty much 
> the same as the large resonator so that implies that output voltage 
> is pretty much the same. Now that is reasonable because of higher 
> losses and possibly reduced k probably compensated for by reduced 
> total capacitance.
> 
>     The cruncher: The large resonator has created those rare long 
> sparks measured well over 4 feet p-p. The little one is struggling to 
> get to two feet p-p. This is with exactly the same primary coil and 
> cap, energy and gap setting. This situation echoes someone recently 
> switching from a 3" (?) coil to a 6" one. The air discharges from the 
> terminal are a bit shorter with the small one suggesting the reduced 
> capacitance might be a factor. I have not as yet taken any real 
> measurements but will sometime today.
> 
>     The question: why?  Any input sought, Ideas welcome from all. 
> I'd like to hear from anyone, no matter how trivial you think your 
> contribution might be.
> 
> Regards All,
> Malcolm
> 
>