Re: 42" spark from 12/30 NST (fwd)

---------- Forwarded message ----------
Date: Fri, 22 May 1998 13:33:04 EDT
From: FutureT <FutureT-at-aol-dot-com>
To: tesla-at-pupman-dot-com
Subject: Re: 42" spark from 12/30 NST (fwd)

In a message dated 98-05-21 23:55:03 EDT, you write:

>     You're talking about getting 42" sparks from a 12kv, 30ma NST?
> That sounds pretty efficient--is it possible?

Jonathan, all,

You've probably already seen the specs for the above which I
posted yesterday (?).  There are a few keys to getting the most
from an NST powered TC. 

First, resonant charging must be used...
the cap size must be matched to the NST size so that the reactance
of the tranformer is neutralized by the reactance of the cap.  This
allows the NST to draw more than its rated current, actually about
double or more than its rated current.  This coil draws 720 watts,
not the 360 watts that would be expected.  

Second, a good gap system must be used.  I've had the best
results using synchronous rotary gaps with NST's.

Third, the toroid must be the correct size for the system.  It must
be selected so that only one output spark streamer is produced. 
The production of multiple streamers will reduce the spark length
a little.  Also the coupling should be optimized to obtain best one
streamer output.  High secondary coil inductance also seems to
be quite important.

Many people on this list have cautioned that the NST may be
strained by the above usage.  This is possible, but I have not had
any failures in my systems, whereas many people have reported
NST failures while obtaining much shorter sparks.  I will agree that
this usage does push the capabilities of the NST.  I recommend that
this technique be used only by those who wish to obtain the maximum 
possible output from any given NST.

John Freau