Re: SSTC output looks more like SGTC output!

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Stephen Conner by way of Terry Fritz <teslalist-at-qwest-dot-net>" <steve-at-scopeboy-dot-com>

At 20:10 18/06/03 -0600, you wrote:
>Original poster: "Steven Ward by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><srward16-at-hotmail-dot-com>
>
>
>Another thing to note is the apperance of the RF envelope.  When not 
>drawing sparks, it looked like a pretty much round blob (the common 
>look).  But when pulling arcs, the blob turned into a series of very 
>short, but equal in amplitude blobs.  Seems like each blob was an output 
>spark, and would explain the 5khz noise maybe.
>
>Any thoughts?  Maybe someone wants more information?  Please let me know, 
>im kind of interested in this!

Steve, it sounds like the new secondary is generating enough RF field to 
feed back into your control circuit and cause it to 'squeg' on and off at 
5kHz. In other words you might have accidentally turned your CW SSTC into a 
pulsed SSTC, and the output from pulsed SSTCs is known to look like that 
from a conventional spark gap coil.

I had trouble like this working with the OLTC. Whenever I drew an arc to 
ground, my stereo would start to make a terrible crackling noise, my scope 
screen would go blank, and the firing rate of the OLTC itself would change 
drastically. I think arcs to ground cause a kind of mini-EMP as the 
capacitance of the toroid suddenly discharges through the low-resistance 
streamer path. The bigger the toroid, the bigger the EMP.

Screening the control box sorted the OLTC out, but didn't make the stereo 
or the scope any happier :(

Steve C.