Re: Recycled: Measuring Coupling Coefficients

From: 	Alfred C. Erpel[SMTP:aerpel-at-op-dot-net]
Sent: 	Thursday, December 04, 1997 5:52 PM
To: 	Tesla List
Subject: 	Re: Recycled: Measuring Coupling Coefficients


    What is the factor "M" in the equation quoted below? Thanks.


>>"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.