RE: 1/4 wave TC (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 25 Jul 2007 19:51:27 -0400
From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: 1/4 wave TC (fwd)

I think you meant to say "Never run your coil withOUT a toroid or some
type of topload".

I would agree that running with a top load will result in much better
performance than without, as the higher capacitance represents a larger
reservoir to supply current to the streamers.  My experience has been
that a bigger toroid is always better.  Running with a top load also
prevents damage to the secondary from corona at the top of the coil.

But I've never before heard that secondary harmonic suppression is
dependant on the e-field shape.  I didn't even think that there was a
significant harmonic content present in the secondary, as it's a fairly
high Q resonator.

Skip is using s 9kV/120 NST with a sync RSG and a .027uF cap.  For use
at 120 BPS, the cap is too small by a factor of 4, and this would
explain why the safety gap is firing.

Gary Lau
MA, USA

> From: resonance <resonance@xxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: 1/4 wave TC (fwd)
> 
> 
> Run your data on JAVATC and you will get nearly the exact tuning tap
> point --- might vary at most 1/8th turn.
> 
> Never run your coil with a toroid or some type of topload.  Without
> equalized electrostatic field shaping down the secondary the coil
usually
> tries to run at multiple frequencies, ie, some of the harmonics are
not
> surpressed enough, and your coil will usually quickly be destroyed.
> 
> If your safety gap is firing at 140 volts, something is wrong with
your
> tuning.  JAVATC will solve it for you.
> 
> 
> Dr. Resonance
> Resonance Research Corp.
> www.resonanceresearch.com
> 
> 
> ----- Original Message -----
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Wednesday, July 25, 2007 1:21 PM
> Subject: 1/4 wave TC (fwd)
> 
> 
> >
> > ---------- Forwarded message ----------
> > Date: Wed, 25 Jul 2007 12:21:32 -0400
> > From: Skip Greiner <skipg@xxxxxxxxxxxxxxx>
> > To: Tesla list <tesla@xxxxxxxxxx>
> > Subject: 1/4 wave TC
> >
> > Hi All
> > Well after my capacitor literally exploded and destroyed both the
> > primary and secondary of the first 1/4 wave TC, a new one has been
built
> > and is in test. The specs are:
> > Primary: 7 turns, 1/4" tubing, 19" in diameter
> > Secondary: 390 turns #22ga, 0.050" overall diameter insulated wire,
14"
> > diameter, winding len:19.5", frequency len of wire: 217khz, wire
length
> > 1429'
> > Measured Resonance of secondary is 210 khz. no excitation
> > With 5 x 20 toroid: 205khz
> > With two 5 x 20 toroid: 150 khz
> > Driver: 9kv x 120ma NST
> > Break: SRSG with 2 poles
> > Cap: .027
> >
> > Some of the test results:
> > Variac set no higher than 40 or about 50 volts input
> > Spark length:
> > No toroid: multiple 12" (+) arcs from top turn of sec
> > One toroid: 20" (+) from breakout point
> > Two toroid: 27" (+) from breakout point
> > Operating freq: with toroids: 140khz
> > Operating freq: without toroids: 190khz
> >
> > Note that the wire length frequency and the operating frequency with
no
> > top load under power are pretty close. I am trying to figure out how
to
> > concentrate the discharges into a single streamer without a top
load. I
> > seem to be processing a large amount of power and the total amount
of
> > sparks with or without a top load seems to be similar.
> >
> > Above the "40" setting of the variac the NST safety gaps really fire
> > nearly all of the time and so far I am afraid to open up the gaps
which
> > are set to about 0.125". Does anyone have a comment as to the
maximum
> > safety gap opening that I might use on a 9kv NST? It looks like this
> > thing will really perform at higher inputs but I do not want to risk
the
> > NST yet.
> > Skip
> >
> >
> >
> >
> >
> 
> 
>