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Re: [Amps] resonance

To: <>
Subject: Re: [Amps] resonance
From: "Jim Forsyth" <>
Date: Mon, 5 Jun 2006 10:04:15 -0700
List-post: <>
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 

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" <>
To: <>
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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