Rich said:
> If an L-network was resonant on the operating frequency, infinite
current would flow through it because the reactive components are
equal, opposite, in series, and not in parallel.<
Only because of your non-rigorous definition of resonance. AC theory tells us
that the only definition of resonance that holds for all cases is that the
applied voltage and current are in phase. The 'XL=XC' definition is a very
loose approximation, and falls over badly when Q is low. There are occasions
where it doesn't matter, but for an understanding of what is happening, it is
necessary to appreciate the inherent errors in the approximation. The
difference can be very important where feedback is applied, because a tuning
error can lead to instability.
Ian says that in practice, it doesn't matter. Not to the appliance operator, I
suppose.
73
Peter G3RZP
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