Rich says:
>If the reactance of the inductor is equal to the reactance of the
>capacitor, the L-network presents a short to the generator. What is the
>impedance of a series-resonant circuit?
Firstly, let's say it again. Resonance is where the input impedance of the
network is resistive i.e. volts and amps are in phase. (There's another case
where they are 180 out of phase, but that be neglected here)
There are 4 varieties of L network.
Series L, shunt C across the output.
The effective shunt C is modified by the impedance of the load across it. It
looks like an R and C in series. So it does not go to a short circuit.
Series C, shunt L across the output.
The L is modified by the load to look like L and R in series. never goes
short circuit.
Shunt C on the input, series L. Obviously can't go to a short circuit.
Shunt L on the input, series C. Obviously can't go to a short circuit.
Suggest you look at 'Electronic Applications of the Smith Chart' by Philip
H. Smith. It's actually the best book I've found on Smith Charts, although
the title sort of suggests that there are non electronic applications for
it. Those I would love to see!
Sorry Rich, we seem to have this total disconnect in that your definition of
resonance and Q is different to everyone else's, and to that which
electrical engineering generally accepts. Bit like the little old lady who
went to see her grandson's passing out parade after he finished basic
infantry training. 'He was ever so good' she said, 'he was the only one in
step!'
73
Peter G3RZP
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