Gene Fuller wrote:

Cecil,

The phase is uniformly zero, so the phase shift is also zero.

Your messages seem to imply that there is some sort of characteristic
"phase shift" in a loading coil. Ain't so.

In the example of a standing wave antenna the phase shift is zero, both
experimentally and theoretically. (Approximate. Real world conditions
might cause small non-zero shifts.)

If you place this same loading coil in a traveling wave antenna you can
undoubtedly measure some sort of phase shift. (Exact amount left as an
exercise for the student.)

Bottom line: Any characteristic, such as phase, that explicitly depends
on the wave nature of a signal needs to be referenced to that condition,
not some arbitrary setup.


It's likely that quite a number of people don't realize that there's no
phase shift of current or voltage along a short or open circuited
lossless transmission line -- except for, like on an antenna, periodic
polarity reversals.

Roy Lewallen, W7EL