Well it seems to me that the subject of resonance is about the fact that an
oscillation applied to a resonant system produces the greatest effect in
that system at a particular frequency. That frequency is of interest because
it has uses in the real world. In our case it allows us to select out a
desired radio signal from a spectrum of unwanted signals. It is therefore
useful to be able to calculate that frequency from the values of the system
components.
In a parallel tuned circuit containing resistance the frequency at which Xc
= Xl is not, in general, the frequency at which the greatest signal
magnification occurs so it is not useful as a definition. It can be used as
an approximation in cases where the resistance is low enough to be ignored.
Jim, AF6O
 Original Message 
From: "Bill Turner" <dezrat@copper.net>
To: <amps@contesting.com>
Sent: Monday, June 05, 2006 9:23 AM
Subject: Re: [Amps] resonance
> That depends on how one defines "resonance". As I understand it,
> there are two possible definitions for a parallel tuned circuit:
>
> 1. When Xl = Xc
> or
> 2. When the impedance is maximum.
>
> If there is significant resistance in the circuit, the two
> definitions will occur at slightly different frequencies. The greater
> the resistance, the greater the difference.
>
> I remember reading this years ago. Correct?
>
> 73, Bill W6WRT
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