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.
73
Peter G3RZP
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