Cecil Moore wrote:
Jim Kelley wrote:
So why do you have to go to all that trouble when you want to measure
traveling wave current, but not when you want to measure traveling
wave energy?

When one measures traveling wave energy, one
is measuring an average calculated scalar value
usually forward power minus reflected power or
RMS V*I in a dummy load resistor.

Not necessarily.

When one is measuring delay, one is measuring
instantaneous traveling wave phase in real time.

Why not just measure the delay in the instantaneous arrival of energy?
That's what pulses generators are for. Or, simply subtract the
undesired wave from each measurement. Search on the term 'Thruline' for
some tips on how to measure traveling waves.

Trigger on the zero crossing of the input signal
and measure the delay until the output signal
crosses zero.

That delay measurement doesn't work for standing-
wave current because the zero-crossing on the
input and output occur virtually simultaneously,
i.e. there is no relative phase shift between
input and output or between any two points on a
1/4WL wire monopole.

Flummoxed by a 'wave' which, by all accounts, does not actually exist as
such - and yet according to you it can have (or can't have, depending on
which post one reads) a phase shift or delay, whichever you prefer, and
which (according to you) has actually been quantified (3nS) by others.

It's worthy of a at least a crank.net citation if not a full article in
the Journal of Irreproducible Results. :-)

The problem is that it's difficult to put much faith in the measurements
you report when you so badly misunderstand and mischaracterize the
measurements reported by others. That is the only point of any of this,
Art.

ac6xg