On Jun 9, 9:29*pm, Keith Dysart wrote:
Ahhh, so you are only claiming that 'on average', the energy does not
enter the PA or 'on average' the energy is reflected.

Of course, you already knew that because I have never said otherwise.
I have stated my opinion more than once that instantaneous (virtual)
power is not worth discussing. Here is what I said on my web page:

"Please note that any power referred to in this paper is an AVERAGE
POWER. Instantaneous power is beyond the scope of this article,
irrelevant to the following discussion, and "of limited utility"
according to Eugene Hecht. [4]"

I have an ample library and cannot find any reference to instantaneous
(virtual) power other than it is "of limited utility", as Hecht noted.
Most of the references imply that paying close attention to the
reality of instantaneous (virtual) power can lead one down a primrose
path to false assumptions.

The finer grained time domain analysis, reveals that some energy does
enter the PA, but that it comes back out again to keep the average the
same.

So what? If it is not dissipated or radiated, it doesn't matter to
anyone (except you).

It would
be good if you were to articulate these limitations to the readers
to reduce confusion.

I have always said that I was talking about power dissipation in a
source resistor or load resistor (or radiation), but you already knew
that. I have said that instantaneous virtual power is irrelevant and
not worth discussing.

Here is a question for you. Given that P(t)=V(t)*I(t), we measure 10
watts at each of 10 points within a single cm., five just inside a
source and five just outside the source. Does that mean we have 100
watts in that single cm.? What is the physical meaning of being able
to measure an infinite amount of power given an infinite number of
measurement points?
--
73, Cecil, w5dxp.com