Roger wrote:

I agree that we would have the same problem with a perfect current
source which had an infinite impedance.

How about using a perfect POWER source, that could not absorb power.
Output power would be limited by the external impedance. Mathematically,
the perfect POWER source would be described by

Ps = (Vp^2)/Zvp = Zip * Ip^2 where Ps = maximum power output, Vp =
voltage from perfect voltage source, Zvp = 0, Zip = infinity, and Ip =
current from a perfect current source.

The power output could be infinite, but power could never be absorbed by
the source.

Just as for both perfect voltage and perfect current sources, the actual
power output would be limited by external loads.

The impedance of the perfect POWER source would be Vp/Ip, both
controlled by external loads. To me that means that the output power
from the perfect POWER source would follow the impedance presented by
the load, but power going into the source would be defined as being zero.

Would the "perfect power source" be acceptable to you?

No. As I mentioned on another thread, this is a nonlinear device, which
would not permit using the linear circuit analysis I used. It would
require reverting to fundamental differential equations, which I'm not
willing to do. I'll be willing to use absolutely any linear source
(which doesn't change during the analysis period) you can devise. Any
linear source can be reduced to a Thevenin or Norton equivalent to
produce identical results.

Can't your concept of transmission lines deal with linear sources? If
not, why not?

Roy Lewallen, W7EL