Actually, the GDO won't measure a parallel resonant circuit!
Just consider what happens. We'll put a coil in parallel with a capacitor, and
couple (magnetically) the GDO to the coil. The magnetic field from the GDO coil
induces a current in each turn of the coil to which it is coupled. The current
induced is in series with the coil, and so the circuit is really a series
resonant circuit, not a parallel one. The same thing happens with link coupling
to a parallel L and C.
For most practical purposes it doesn't matter, because when the Q is greater
than about 5, the difference in resonant frequency between series and parallel
is minimal and may be ignored, although with low Q at VLF it can have
interesting effects.
Again, in reality. a component with inductance and distributed capacity can
show resonance on a GDO, merely because the distributed components resonate
somewhere.
Awaiting the flames!
73
Peter G3RZP
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