Re: 1/4 wave TC (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 27 Jul 2007 10:03:56 -0400
From: Skip Greiner <skipg@xxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: 1/4 wave TC (fwd)

Matt...A couple of my comments below

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Thu, 26 Jul 2007 15:55:09 EDT
>From: Mddeming@xxxxxxx
>To: tesla@xxxxxxxxxx
>Subject: Re: 1/4 wave TC (fwd)
>
> 
>In a message dated 7/26/07 1:28:27 P.M. Eastern Daylight Time,  
>tesla@xxxxxxxxxx writes:
>
>.  Unpowered, the 
>resonant frequency of the secondary with no top load is  about the same 
>as the 1/4 wave frequency of the wire length in the  secondary.
>.
>
>My intention with this coil was to build a secondary  that would resonate 
>at the at the 1/4 wave frequency of the wire length  used in the 
>secondary. Indeed, with no top load, the overall excited  resonant 
>frequency of the secondary is only slightly below the non powered  
>resonant frequency
>
>
> 
>Hi Skip,
> 
>Have you considered the following:
> 
>1) You have made a coil whose resonant frequency has a quarter wavelength  
>that is equal to the straight wire quarter wavelength, but as soon as you put  
>the first bend in the wire, the "EM distance" between the two ends is no longer 
> that of the straight wire. Once you have put ~380 bends in it such that the  
>straight-line distance in three dimensions from end to end is  only ~19 
>inches, then that quarter wave number really seems to lose any  significance. 
>  
>
Interestingly, the unpowered resonance of the coil is approximately the 
same frequency as the 1/4 wavelength of the wire....even with all of the 
bends, just as JAVATC predicted. I actually designed the coil to be at a 
slightly higher frequency knowing full well that the discharges would 
lower the overall frequency. I expected the powered resonance to be 
lower due to the discharges.


> 
>2) As the streamers form, they drop the resonant frequency of the  secondary. 
>The streamers themselves become a constantly growing and shrinking  topload, 
>as they form, grow, disappear, and new ones re-grow. When there is no  other 
>topload, the percentage by which the streamers affect the  frequency is 
>greater. Since, when anything is happening, the frequency  is constantly changing, 
>what is the relevance of the wavelength at which nothing  is happening?
> 
>Matt D.
> 
> 
>  
>
I can find no change in the frequency of the coil when powered at 
different levels that cause the discharges to be at different lengths. 
The scope gives a pretty clear indication that the oscillations are pure 
and not varible.
Skip




>
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