ORIGINAL MESSAGE:
On Thu, 3 Aug 2006 17:31:32 -0400, you wrote:
>I'm not aware of any rule that says a GDO can't measure a
>series-resonant system. Are you? Are you actually trying to
>say a GDO can't measure a series resonant system?
------------ REPLY SEPARATOR ------------
Yes, I am. What you apparently do not understand is how a GDO works.
The dip is created by the parallel resonant circuit absorbing power
from the GDO's oscillator. The GDO couples a surprising amount of
power into a parallel resonant circuit and the "ringing" effect of a
parallel resonant circuit quickly builds up voltages and circulating
currents of a remarkably high magnitude, much like a lightly loaded
amplifier tank circuit. Since no circuit is lossless, the GDO must
continuously furnish power into the circuit, and the most effective
coupling is done at the resonant frequency of the parallel circuit.
That's why the dip indicates resonance.
A series circuit can not do this and thus can not be measured by a
GDO. You can rewire the series resonant circuit in any number of ways
to make it into a parallel equivalent, but then you no longer have a
series resonant circuit.
And now you know the rule.
Bill, W6WRT
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