"Richard Fry" wrote in message
...
"Roy Lewallen" wrote:
All the power produced by the transmitter arrives at the antenna
less whatever is lost as heat in the transmission line.
_________

Roy,

If a transmitter produces r-f power, and a load connected to that
transmitter via a transmission line dissipates any of that r-f power, then
would you not agree that such an r-f transmission line conducts at least
whatever r-f power is dissipated by that load?

And if such a transmission line can conduct power in one direction
(incident), it can also conduct power equally well in the opposite
direction (reflected), until the net result of incident + reflected causes
line failure.

When the Zo of a transmission line matches the Zo of a load at its far
end, then that far-end Z absorbs nearly 100% of the power delivered there
by that transmission line.

If those impedances are not matched, a reflection is generated that may
lead to the real-world, destructive and periodic effects on the
transmission line that I reported from personal experience, earlier in
this thread.

RF

no transmission line conducts power. it conducts moving electrons which are
measured as a current or voltage. power is a figment of our mathematics
that has created a convenient way to take the current and/or voltage and/or
impedance (only 2 of the 3 are needed) and convert them to a measure of
energy flow, or power, that happens to be a nice conceptual way to view
things. we could just as well give up all readings of power and state taht
a transmitter produces 1 amp into a 50 ohm load instead of that it produces
50 watts... the former is more descriptive, the latter is simpler for the
non-engineer.