Jim Kelley wrote:
You should think about it because amateur radios don't usually have
circulators on their output, and the result illuminates a corner of the
discussion that you've been pretty closed minded about.

Here's a brainteaser for you, Jim. Assume the following example
under steady-state conditions:

XMTR--X--tuner--Y--one second long lossless feedline---291.42 ohms
Ps=100W Pfor=200W-- --100W=Pref PL=100W

The lossless tuner is tuned for a Z0-match so there is zero
reflected power at point 'X'. The Z0 of the feedline is 50
ohms. The voltage reflection coefficient at the load is
0.707 making the power reflection coefficient 0.5

We suddenly disconnect the source at point 'Y'. After the
source is disconnected, how many joules of energy are delivered
to the load? _____

How many seconds does it take to dissipate all the energy in
the feedline? _____

On a second by second basis, how much power is delivered to the
load after the disconnect? _____ _____ _____ _____ _____
--
73, Cecil, http://www.qsl.net/w5dxp