Re: Recycled: Measuring Coupling Coefficients

From: 	Edward V. Phillips[SMTP:ed-at-alumni.caltech.edu]
Sent: 	Wednesday, December 03, 1997 1:27 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Recycled: Measuring Coupling Coefficients

"Refer to Terman's
Radio Engineers' Handbook. For example, in radio circuits the K factor
varies with the frequency because of the variable  tuning capacitor.
Changing this capacitor changes the operating frequency and changes the
coupling. "
	Refer to Terman a bit more carefully.  The coupling factor
for an inductor is simply M/sqrt(Lp*Ls), no matter what the circuit.
If there is  coupling through both mutual capacitance AND mutual
inductance (not at all the case for Tesla coils) then the effective
coupling factor DOES change with the value of the tuning capacitors.