Jim Kelley wrote:
You can't get 400 watts to a load using two 100 watt PA's no matter how
much interfering and averaging you do, Cecil. How can you even make
that claim with a straight face?

I didn't make that claim. I challenged Keith to prove it
was possible. Only then could he claim that sources
obey the rules of superposition.

But let's talk about superposing two 100 watt waves
in a 50 ohm transmission line. Never mind exactly
how it is accomplished for now.

Wave1 = 70.7V at 0 deg and is 70.7^2/50 = 100 joules/sec
Wave2 = 70.7V at 0 deg and is 70.7^2/50 = 100 joules/sec

Please superpose those two coherent waves within a 50
ohm transmission line and see what answer is obtained
for total voltage and total power.

Hint: Power = V^2/Z0

You can visualize the superposition by going to the
following web page and setting both phases to zero.

http://micro.magnet.fsu.edu/primer/j...ons/index.html
--
73, Cecil http://www.w5dxp.com