In a message dated 20/02/2005 10:34:05 GMT Standard Time, r@somis.org writes:
A Pi-network is not resonant because it is two L-networks in series,
and L-networks never operate at resonance.
This depends upon your definition of resonance. The only definition that is
mathematically applicable to all tuned circuits is that the applied voltage
and current are in phase. Under these circumatances pi and L networks are
resonant.
Any other definition give sproblems with analyis of circuits such as low
level tuned amplifers, even oscillators, and phase discriminators such as the
Foster Seeley. Using XL = XC is a convenient approximation, especially where
the
Q is high, but is not strictly correct, and can easily lead to errors unless
its inherenty simplification is realised.
73
Peter G3RZP
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|