>
>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
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|