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K Factors
Subject: K Factors
Date: Sun, 11 May 1997 21:36:18 +0000
From: John H. Couture" <couturejh-at-worldnet.att-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
To All -
Coilers who wish to experiment with the K Factors (coupling) of their
coils may not realize that they do not have to move the secondary coil
in
relation to the primary coil. The K Factor can be changed by adding
turns to
the top of the secondary coil. The secondary can be built with this in
mind.
Of course the primary coil turns or capacitor would also have to be
changed to keep the system in tune. Adding turns to the secondary coil
will
reduce the K Factor and reducing turns will increase the K Factor.
For math oriented coilers the equations are
Lm = K sqrt(LpLs) and K = Lm/(sqrt(LpLs))
where Lm is the mutual inductance, K the K Factor, Lp the primary
inductance, Ls the secondary inductance. The K Factor, Lp, and Ls can be
found by tests so the mutual inductance Lm can be calculated.
All of these parameters can be calculated without tests but the calcs
are
tedious and time consuming. A computer program like the JHCTES can save
you
time and effort.
John Couture