Re: VTTC provisional results

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

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 3/19/01 9:18:17 AM Eastern Standard Time, tesla-at-pupman-dot-com 
writes:

> - Did you connect the case of your scope to the rf ground or to the 
>  ground of the house wireing system?

Herwig,

I use the house ground as the RF ground also.   The scope has a
plastic case, and I don't bother grounding the scope, but I used to.
I don't worry about the RF ruining anything.  It seems feeble in a
tube coil.

>  
>  > You'll see the RF envelope on the scope.
>  - This should be a perfect method for monitoring audiomodulation 
>  as well.

Yes, it works perfectly for that too.
>  
>  > I just realized, if you want to get the typical long AC type sparks 
>  I'm familiar with, you'll have to use just one of your phases, instead 
>  of 3 phases.
>  - The problem was to find a suitable 1 phase HV tranny. In this 
>  country the mains voltage is 230 V/50 Hz and the standard 
>  breakers are 16 A. If you wanted more power, the only way 
>  (besides having installed a new wall outlet) is to use the 400 V/ 3 
>  phase system, which is standard in all buildings. So, when I came 
>  across this 3 phase HV tranny, the way to go was obvious.

Can you just use the output across two legs of the 3 phase
transformer?  Even though, the power is less, the sparks may
be longer because of the single phase.
>  
>  > Staccato would be hard to control with three phase power since 
>  the power never goes to zero.
>  - That is correct, especially if you used a 6 pulse full wave bridge 
>  rectifier. 
>  Another drawback of 3 phase systems is that ballasting could be 
>  difficult. Either you could use a 3 phase ballast at the primary side 
>  of the transformer or a single ballast at the secondary side. But 
>  this is HV....

I don't use any ballasting for a tube coil.  Are you refering to the
use of a spark gap TC?

John Freau

>  
>  Regards,
>  
>  Herwig
>