[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Iron transformer positioning under the primary experiment

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Garry,

I suspect this is exactly what DC is getting at. However, we should probably keep things in perspective. If we assume 20KV is being discharged into, say a 10 turn primary, each turn will have 2000V. There may be a loop created between the NST terminals and the Terry filter equivilent to a one turn loop antenna that could be coupled into by the primary by some amount. Lets say the coupling is the same as between primary and secondary and is k=0.15. This would result in a 300V signal coupled into this NST/filter loop bypassing the filter benefit to some extent - probably not significant compared to the 20KV RF that the Terry filter is trying to keep off the NST.

Gerry R.

Original poster: "Garry Freemyer" <garryfre@xxxxxxxxxxx>

Hmm, I wonder if he means that parts of the filter might act as antennas
that pick up high frequency.

It would be a rather conclusive experiment to scope the outputs of the NST
and see if moving the filter has any effect.

If it proves the Doctor right, it would be a good case for possibly
enclosing the filter in some sort of grounded, gel or wax filled metal
container and see if that has any fixes. Any coil that I might have that has
more than 3 parts to remember to take along would be a nightmare, of me
forgetting parts at home and at destination.

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Monday, July 10, 2006 12:16 PM
To: tesla@xxxxxxxxxx
Subject: RE: Iron transformer positioning under the primary experiment

Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>

Hi Dr:

I'm curious why you suggest that a Terry filter is of no value if it's
under the primary coil.  If the NST(s) were located remotely from the
coil assembly, then I'd agree that locating the filter under the primary
is bad, but only because it's distant from the NST's.  But if the NST is
also close to the primary, I don't see how the filter's proximity to the
primary compromises its effectiveness.  Or were you just cautioning not
to locate the filter far from the NST's?

Regards, Gary Lau

 > Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>
 > It's not only the metal proximity that should be considered.  Any
 > closed turns in a transformer coil that are under or near the primary
 > coil will pick up spurious spikes and may damage the transformer or
 > induce these nasty very low microsecond spikes into the 60 Hertz
 > power line.  Also, directly under the primary, a Terry filter really
 > is of no value.
 > It is easy and cheap to simply enclose the power transformer and
 > Terry filter in a suitable enclosure 5-6 feet away from the coil.  No
 > need to take chances.  It is simply poor engineering practice.
 > Dr. Resonance