[AMPS] Practical PI Nets

[measures]

>
>Rich says;
>
>	>The apparent resonant frequency of two L networks in series is not
>the 
>	>operating frequency.  
>
>Previously, Rich has defined resonance as the frequency where XL = XC. In
>low Q networks, this isn't necessarily so, and further, the only definition
>that holds correctly for both series and parallel tuned circuits is that
>applied voltage and current are in phase. Unless the working Q of the
>circuits is low, the approximation involved is reasonably accurate, but for
>Q's of 15 and less, there can be a problem.
>
>It all depends on your definition of resonance. With my definition that the
>applied voltage and current are in phase, then the circuit is resonant at
>the operating frequency.
>
>This doesn't mean that Rich's definition is wrong - just that it gives a
>different answer.
>
€    prove the phenomenon for yourselves if you are curious.  Tune up a 
linear amplifier correctly on say 3900KHz.  Shut the amplifier down and 
pull the plug.  Measure the resonant frequency of the Pi-network tank 
with a dipmeter.    
>
cheers, Peter

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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