[Prev][Next][Index][Thread]
Re: Non-Linear Coil Winding Experiment. (and more tests!)
-
To: tesla@pupman.com
-
Subject: Re: Non-Linear Coil Winding Experiment. (and more tests!)
-
From: Tesla List <mod1@pupman.com>
-
Date: Tue, 14 Oct 1997 13:39:33 -0600 (MDT)
-
Approved: mod1@poodle.pupman.com
---------- Forwarded message ----------
Date: Wed, 15 Oct 1997 08:03:28 +1200
From: Malcolm Watts <MALCOLM@directorate.wnp.ac.nz>
To: tesla@pupman.com
Subject: Re: Non-Linear Coil Winding Experiment. (and more tests!)
Hi Terry,
I have another comment on your results that may interest
you...
> From: terryf@verinet.com
> To: Tesla List <tesla@pupman.com>
> Subject: Re: Non-Linear Coil Winding Experiment. (and more tests!)
<snip>
> One thing that blew one of my pet theories to hell is that the
> quarter wavelength for a 235.6 foot long wire is 1043.7 kHz. All these
> coils exceeded that frequency considerably (so much for worrying about wire
> length vs frequency). I tried very hard to find a lower resonant frequency
> but it simply wasn't there. The fields around the coils were consistent
> with a quarter wave resonance so I am sure I didn't hit an off harmonic. It
> took me awhile to find it up at 1.6 MHz. All the coils were tested one
> after the other with no change to the test setup.
That is par for the course IMHO. I have done much the same as you in
the past and came to the realization that in trading C for L in
coiling the wire up, the drop in C is not compensated for by the
increase in L and there is a very good reason why this happens: in a
single layer coil, there is less than optimum mutual inductance
between turns for the coil as a whole.
Malcolm
<snip>