RE: [TCML] Q

["Jim Mora" <jmora@xxxxxxxxxxx>]

Hello,

I seem to remember that high Q, from a technicians view point, is indicated
by a high, steep conductance or peaking at resonance, lower Q would be a
lower peak as seen on an oscilloscope (your government wood bell).

To achieve a higher Q, you speak to increased coupling. Where is the trade
off crossing point as the primary diameter becomes smaller and smaller in
respect to the height of the coil? Simply put, what are the practical ideal
design parameters for a high Q primary? My 15 degree 8" coil had a very
sharp "peak" at resonance and performed very well.

Since I am about to build a 12"d DC coil, I want to design a primary that
would be most ideal using 1/2" Cu tubing or...should I again consider a
conical primary design which is harder to build?

I seem to remember Richard Quick speaking about a primary diameter to
secondary height ratio; but then his sig file was "...throw another megavolt
across it." :-^)

Thanks,
Jim Mora 

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of nnanred1@xxxxxxxxxxx
Sent: Sunday, December 02, 2007 1:42 PM
To: tesla@xxxxxxxxxx
Subject: RE: [TCML] Q

hi,
on the subject of Q, what i wanted to say wont help you, at least directly,
but it helps one to get a physical notion of what Q means.  in mathematical
terms the Q of the system is ( Qp x Qs ) / ( Qp + Qs).  so you see this
additional mess, and you wonder what now does Q of the system mean?
Q physically is how many cycles your coupled system will oscillate when
"struck" with an electrical pulse.  no different that ringing a bell or
hitting a drum. A system with a Q of 100; will oscillate 100 cycles as it
dies out exponentially.
a bell with a high Q will ring a long time before it finally damps out.  a
crummy bell; say like the goverment may build, out of wood; will be very low
in Q, and just be "dead beat," and go "thump" when you ring it.
A high Q (as Antonio suggests) in the primary is where the rubber meets the
road.  you want a high Q so your energy can be used effeciently as many
cycles are required to transfer the primary caps energy into the
self-capacity of the secondary.  lots of cycles are required because the
coupling is low (say 0.12).
on the other hand if one uses the thin spiral strip winding submerged in
oil; a coupling of 0.6 or 0.54 can be used without arcing occuring.  when
you start to use the thin spiral strip winding very interesting things will
begin to happen.  the best way to put it is: take off your shoes, for now
you walk on holy ground.
by now, 
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