Tarmo Tammaru wrote:
Jim,
It probably can't be proven, unless somebody comes up with an alternative
definition for SWR. If you look at my simulator equations of a few listings
back, I proved that what my model (and the Bird wattmeter) call SWR is
RL/Z0. So, unless I screwed up, running any number of simulations is not
going to disprove that.

It's hard to imagine how Rs (Zs) could have any effect on that ratio.

If you look at textbook examples where they transmit pulses, The source
impedance determines what V+ is, and whether there is a second reflection
from the source, but NOT what the reflection at the load end is.

Unless I = 0, source impedance should certainly have an effect on source
voltage. My car battery this morning comes to mind. Seemed to have
developed a high internal resistance. It's doing some serious current
limiting.

Chipmans explanation re-reflection was eloquent I thought.

Lets delve
on this for a second. It seems fair to say that if the source impedance
determines V+, clearly it has an effect on V-. But, that does not mean it
has anything to do with rho.

I don't know how else to look at it.

The question that comes to mind is whether the argument is about the
effect source impedance has on actual SWR, or the effect it has on
measured SWR - considering the real world limitations of metering
instruments. Perhaps people are talking about different things.

73, Jim AC6XG