Reg Edwards wrote:
On second thoughts, since L and C are functions of a coil's physical
dimensions it must be something else which is changing with frequency.

Or maybe nothing is changing appreciably over relatively
small frequency excursions. Maybe the measurements are
not measuring what someone thinks they are measuring.

The only experiment so far that has actually measured the
delay through a coil is the self-resonant frequency
measurement.

Tom's and Roy's results are perfectly consistent with
the measurement of standing wave current whose phase
is known to be constant and unchanging. That measurement
yields no new information.
--
73, Cecil http://www.qsl.net/w5dxp