Dave Platt wrote:
On the other hand, if the feedline-path reactance is capacitive, and
happens to be close in absolute value to the inductive reactance of
the choke... then you've got a series-resonant circuit.

This is one reason why an ugly choke only works well over
approximately a 2:1 frequency range. Below that range,
the inductive reactance is too small and above that
range, series resonance defeats the purpose.
--
73, Cecil http://www.w5dxp.com