Secondary resonance freq
From: terryf-at-verinet-dot-com [SMTP:terryf-at-verinet-dot-com]
Sent: Wednesday, June 10, 1998 11:47 PM
To: Tesla List
Subject: Re: Secondary resonance freq
At 07:54 PM 6/10/98 -0500, you wrote:
>From: Bill the arcstarter [SMTP:arcstarter-at-hotmail-dot-com]
>Sent: Wednesday, June 10, 1998 10:16 AM
>To: marco-at-vistacom.fi; tesla-at-pupman-dot-com
>Subject: Re: Secondary resonance freq
>> I measured yesterday the resonance frequencies of my secondary. It is
>> 4.3" diameter PVC tube, winded for a length of 19.7" with AWG 26 wire.
>> I got the following results:
>> 324 KHz
>> 813 KHz
>> 1475 KHz
>> 1766 KHz
>> 2053 KHz
>I measured some similarly 'weird' values for a friend's coil.
>Approx dimensions are 3 inch diam, ~24 inches long, way too many turns
>of #30 or smaller magnet wire...
>First resonance was at 208 KHz
>Second was at 512 KHz
>Third was at 800 some odd KHz.
>I would have expected the 2nd resonance at 2x or 3x 208KHz but it didn't
>work that way...
>I noticed that only the first resonance was very deep (an indication of
>Q?). The others did dip, but not as far, etc.
>Any ideas what this means?
>All resonance points shifted according to the proximity of stray
>objects, etc. Testing was performed w/o a topload and the output of the
>sine generator was scoped directly through a sense resistor.
>-Bill Pollack (arcstarter)
I notice that the second peaks occur at ~2.5 times the fundamental in both
of your tests to within 2%. That means something! I don't know what but
there is a truth to be learned here.