"Cecil Moore" wrote in message
...
Peter O. Brackett wrote:
I was just castigated by Roy and Dave Robbins on another thread for
making
postings about
"ports", apparently we are not allowed to discuss "ports" when we are
discussing transmission
lines since ports have only to do with networks and transmission lines
have
no ports!!!

Darn Peter, I was hoping you could help me explain to Roy what is wrong
with
his analysis - that he is using a 2-port analysis and getting four power
terms
as a result, two of which have to be added to get forward power and the
other
two of which have to be added to get reflected power.

i like ports, i use them all the time in network analysis, they are an
important part of the tcp/ip protocol!. for transmission lines all you
really need is voltage OR current waves, everything else falls out from
those. computing power and trying to reflect power can only lead to
confusion, because unless you use the complete formula for complex powers
you are losing important information.... and don't even start on computing
rms or other average powers, then you have totally lost the physical
significance of the waves.