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Re: Pri-Sec Phasing
---------- Forwarded message ----------
Date: Wed, 8 Oct 1997 10:34:02 +1200
From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
To: tesla-at-pupman-dot-com
Subject: Re: Pri-Sec Phasing
Greg, all,
I retuned my work coil this morning (adjusted the
primary cap to compensate for a new terminal). I took the opportunity
to do a phasing measurement on the first 20 turns or so of the
resonator. The primary is a helix. Both coils are wound with the same
sense. I left the primary untuned.
Result: The voltage near the base of the resonator is largely in
phase with the primary. I say largely because even tapping 12pF or so
of scope probe onto a mere 2% of the resonator windings caused a
frequency shift of 1kHz (around 0.7%) in resonance with a *small*
( <<90 degrees ) corresponding phase shift at the tap point.
An aside: I think this peripheral observation fits well with my
artificial model.
V step up at this low tap point corresponded *very* closely with
the turns ratio at this point (about 1:4).
Malcolm