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## [Amps] resonance

 To: amps@contesting.com (Amps) [Amps] resonance Bill Fuqua Mon, 05 Jun 2006 09:51:26 -0400
 ```Maybe it is time to change the thread. Passive Resonance is a frequency selective means of storing oscillating energy. It occurs when energy oscillates back and forth between two complementary energy storage mechanisms. In the case of the pendulum you have kinetic and potential energy. In a circuit the storage mechanisms are the inductance and capacitance. The inductance is the kinetic energy storage mechanism and the capacitance is the potential storage mechanism. When there is a balance between these Xc=Xl the circuit is at resonance. That is because all the energy from one goes to the other and back except for the bit that is lost in the resistance. A pure resistance alone is not resonant. That is the flaw in defining resonance as when Xc=Xl alone. In a resistor zero does equal zero at all frequencies. Another property of resonance is that besides selectivity the energy stored in the system is greater than that passing to or from it when at equilibrium. And the Q is the amount of energy stored divided by the amount of energy going into the resonant system during each cycle. We usually see the other definitions regarding reactance and resistance and bandwidth and resonant frequency. All three produce the same unit-less value. I use the term passive because some of the properties of passive resonance (not all) can be accomplished by active filters and by digital methods. Even though a "flywheel" may store oscillating energy it is not frequency selective, thus not resonant. We often use the term "Flywheel Effect" but "Pendulum Effect" may be more accurate. 73 Bill wa4lav At 10:45 PM 6/4/2006 -0400, Bill Coleman wrote: >On Jun 4, 2006, at 8:23 AM, R L Measures wrote: > > > My dummy load is non-resonant, so that's a problem? > >Dummy loads are resonant by definition, since they provide a purely >resistive impedance. (ie X = 0 is the definition of resonance) > > > >Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net >Quote: "Not within a thousand years will man ever fly!" > -- Wilbur Wright, 1901 > >_______________________________________________ >Amps mailing list >Amps@contesting.com >http://lists.contesting.com/mailman/listinfo/amps _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ```
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