On Apr 10, 4:46 pm, Cecil Moore wrote:
Keith Dysart wrote:
Any example where reflected energy is allowed to
reach the source cannot be analyzed in any valid
real-world way.

A strange assertion. Consider two wire phone lines; transmitter
and receiver at each end. Consider cable modems; ditto. Consider
computer busses; ditto.

We are discussing ham radio sources, Keith, which are
none of the above. How many hams use cable modems for
their RF transmissions? Please get real.

Are you sure there are different rules for ham radio sources
than for all the other ones? Something different about them?
Something that makes them not amenable to the techniques used
for others?

If that is so, I am surprised at your claim that ham radio
sources have something in common with light bulbs and lasers
such that knowledge of those subjects can help analysis, while
any knowledge of the behaviour of other electrical circuits is
for naught.

Seriously though, it does all work. The problems are solvable.
You don't need to throw up your hands and say: "too tough."
And then rationalize this response by calling them "too
different" or saying "insufficient information".
Much can be learned by solving the problems set using more
controlled examples. Try it. Using the regular techniques will
produce the same answer for all the problems you can currently
solve, as well as allowing you to solve ones you currently
declare as unsolvable.

....Keith