This is a question related to radio transmission, I hope this is the proper forum to ask it. It relates to transmission lines connecting a radio transmitter to its antenna.
In his book "Reflections", at the start of Chapter 8, M. Walter Maxwell says "Energy reflected by a mismatched line termination can be entirely separated from the forward-travelling wave, and then be dissipated in a temperature calibrated resistor, and accurately measured as I^2R heat."
He later says "I have performed these measurements many times"
Now I find this book long-winded and too assertive, so I haven't read it all. Is he right? How can we do this measurement? What does it really measure?
I believe that forward and reflected power are mathematical artifacts used to make the calculations possible, and do not exist as separate physical entities. Am I right?