RE: SRSG or ARSG

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

Original poster: "Luke" <Bluu-at-cox-dot-net> 

Wow got it thank you.
I forgot about the fact that the caps become discharged and therefore
need to be charged again, over and over.  The neon load would not vary
like that.  The the extra draw on the nst is due to the cap being
discharged and needing more power.

Did I get this right?

Thanx for making me see the light on that one

Luke Galyan
Bluu-at-cox-dot-net

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, January 15, 2004 7:16 AM
To: tesla-at-pupman-dot-com
Subject: Re: SRSG or ARSG

Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>


To add to John's comments:

NST's are designed to develop 12-15 kV for 1/4 sec to ignite the neon in
the
glass tube.  After ignition it drops back to 200-300 volts and provides
a
steady 60 mA current to keep the plasma glowing bright.  They never were
designed to provide continuous HV especially in the tar insulation many
of
them use.  Any RF at all gets fed back into the NST and they die.  Terry
Fritz's nice filter design helps keep them safe.  Also, always calculate
the
resonant value (xmfr Z = Xc).  For stationary sparkgaps multiply this
value
by 1.6 to keep your cap slightly larger than the resonant value.  For
synchro RSG (120 pps) this multiplier value can be extended to 3.2 x
calculated resonant value.  This is possible because the transformer
isn't
working as hard trying to recharge the caps to fire at 300-400 pps.
We've
gone as high as 3.4 in a test design, but the NST's seem to be happier
around 2.8 to 3.2 x resonant value.  Careful phasing of firing point of
the
synchro RSG is important for optimum performance.

The ideal NST design for TC work would be a core/coil assembly that can
be
dropped into a tank of oil.  I'm working on this solution at present and
hope to offer a nice 16 kV design at 250 mA --- with a shunt that can be
moved depending on the amount of current you need to power the caps.  I
envision a phenolic top to which the xmfr core/coil is attached on short
extension tubes so that the xmfr is lowered into the oil when the top is
attached.  I would fit a small plug that could be used for vacuum
evacuation
to get all the bubbles out.

The shunt would be adjustable from 100 mA to 300 mA to adjust current to
fit
the cap value.

With luck this project will be done by Mar 04.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
  >
  > >May ask why exactly an ASRG is bad for an NST?
  >
  >
  > ASRG can be used, but must not be run to slow or the
  > voltage may go to high for the NST if a suitable safety gap
  > and protective filter is not used.  However the spark lengths
  > will probably be poor.  A small value cap must be used, which
  > will not permit the NST to deliver much power.  Many folks
  > run the ASRG slow at times without adequate protection
  > and destory the NST.  Only 120 bps sync will give the
  > ultimate in spark length performance with NSTs it seems.
  >
  > John
  >
  >
  >