Re: sunc gap? tuning w/ o-scope?

To: tesla-at-pupman-dot-com
Subject: Re: sunc gap? tuning w/ o-scope?
From: Ed Phillips <evp-at-pacbell-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
Date: Fri, 26 Feb 1999 06:34:13 -0700
Approved: twf-at-verinet-dot-com
Tesla List wrote:
> 
> Original Poster: Terry Fritz <twf-at-verinet-dot-com>
> 
>         Don't be at all surprised if the highest primary voltage occurs
FAR after
> the peak in the waveform.  The resonant nature of the primary circuit is
> such that the highest voltage point is after the peak in the waveform.
> That sounds funny, it is kind of hard to explain.  If you back up the
> timing to hit the peak, the whole signal decreses to a lower voltage and
> you are worse off than before.  By far the best way is to set the gap
> timing for the biggest output sparks.  It really is just that simple.  You
> can get into all kinds of fancy theory and measurements but trial and error
> to find the biggest arcs is really the fastest, and simplest way to set the
> gap.  A insulated handle or something that would allow you to turn the
> motor while the coil is operating allows very quick and easy adjustment.  I
> can now sync my gap with the flourescent lights after a little experience.
> Mine needs to be set about 40 degrees off from the peak.  I have a bunch of
> papers at:
> 
> www.peakpeak-dot-com/~terryf/tesla/experiments/experiments.html
> 
> that show actual wave forms and such.
> 
>         I prefere a simple easy to get and plug into the scope scanner type
> commercial antenna for simple TC scope input.  They are a little larger and
> allow the antenna to be set at a nice safe distance.  If you want to make
> real measurements of values and such then you need something better like
> plan wave antennas.  However, inserting a 50 ohm terminating resistor at
> the scope input with a few BNC adapters will clean up the waveforms of a
> scanner antenna remarkably, but not needed for simple stuff.  I could go on
> and on... but this should do for now...
> 
>         Do be very sure that the coils high primary or secondary voltages
NEVER
> accidently make their way directly into the scope input.  The destruction
> would be instant!!  Like my friend Mike the RF guy says.  Yep... That's why
> I like them four channel jobs.  Ya can make four mistakes before ya gota
> send the darn thing in for repair. :-))
> 
>         Terry
> 
> At 10:24 PM 2/23/99 -0700, you wrote:
> >to: Ross
> >
> >A small "antenna" fashioned from a simple 3 inch long wire is located via a
> >coax cable (shielded) at a distance of usually 2-3 feet away from the
> >operating primary coil (exact distance depends on how large your system
is).
> >Secondary coil can be in place or simulated with a 30 Ohm 2 kva resistor
> >(nichrome heater elements) connected across the primary coil to simulate
the
> >secondary "load" condition.  The system is run and the o-scope will display
> >the sparkgap firing and show at what time along the 60 Hertz waveform the
> >spark gap actually "fires".  If it is not at the peak of the charging 60 Hz
> >waveform then the rotor is adjusted on the motor shaft and the process is
> >repeated.  Eventually you will get the system firing right at the top of
the
> >60 cycle peak (actually 2-5 degrees past is best) and your synchronous
> >rotary gap will be delivering energy as the capacitors reach full charge.
> >
> >You might also wish to check the archives --- I believe John Freau and
Terry
> >Fritz have posted some data on this antenna construction.
> >
> >Regards,
> >
> >Dr.Resonance-at-next-wave-dot-net
> >
> >
> >-----Original Message-----
> >From: Tesla List <tesla-at-pupman-dot-com>
> >To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
> >Date: Wednesday, February 24, 1999 2:11 AM
> >Subject: sunc gap? tuning w/ o-scope?
> >
> >
> >>Original Poster: Ross Andrews <sflourine-at-home-dot-com>
> >>
> >>
> >> Hi,
> >>
> >> I just have a couple questions for you more experienced coilers out
> >>there:
> >>
> >> -Many people on this list have talked about "120 bps sync gaps".  Am I
> >>correct in thinking that this is a rotary gap driven by a synchronous
> >>motor?
> >>
> >> -I understand the prospect of tuning a coil by the "trial-and-error"
> >>method, but I have also herd of tuning it with an o-scope.  Is this
> >>feasible?  How is it done?
> >>
> >> Many thanks,
> >>
> >> Ross Andrews
> >>
> >> sflourine-at-home-dot-com
> >>--
> >>If you want to know what God thinks about money, look at the people he
> >>gives it to.
> >>
> >>
> >
> >

	Don't open up that gap before you install a safety gap across the
transformer!!!!!!!

Ed