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You are confusing impedance with resistance. Unfortunately they are both expressed as OHMs. They are not the same thing. Impedance does change with frequency but resistance does not.Respectfully,Carroll

CarrollI have to disagree with that.Resistance can change with frequency,and it is known as the !skin effect!.Im sure you know what that is,and maybe just an over sight on your behalf ?.Brad

Some measurements taken with the core shown a few posts ago@48.3KHz 2.3uH 0.125Ohm (4.7uF(big square red, WIMA 63V))@183.8KHz 2.3uH 0.36ohm (330nF(large green))@331KHz 2.3uH 0.19ohm (.1uF(big blue, verified on WIMA .1uF))@912KHz 3.0uH 1.8ohm (10nF(WIMA red))@5.4MHz 0.4uH 12.5ohm (2.2nF)@11.58MHz 0.4uH 24.2ohm (470pF(burgundy mica))Circuit is the coil in series with a cap and a 0.05 ohm resistor, connected to a signal gen. Voltage is measured across the signal gen and the 0.05 R. The signal gen is adjust to resonance, and the core resistance is calculated asRcore = Vs / (Vr / R) - Rwhere Vs is signal gen voltage, Vr is voltage across R (0.05 ohms), R is 0.05 ohm resistorYou'll most likely need to view the voltages or at least Vr on a spectrum analyzer unless Vr is high enough above noise to an accurate reading.Vr / R is the circuit current.Vs / (Vr / R) is the total resistance.