Jim Kelley wrote:
Cecil Moore wrote:

Jim Kelley wrote:
As far as I know, V/I ratios don't "cause" anything.

They sometimes cause 'rho' which then becomes an end
result and not the cause of anything.

I disagree. Reflections are caused by real impedances not reflected
ones. Have you changed your mind about this?

Where did I say rho causes reflections? I didn't! Your statement
does NOT disagree with my statement.

At a two-port
network with reflections, rho usually cannot be calculated
from the physical impedances involved.

It can certainly be done using the optical formulas for a pair of
boundaries.

Unfortunately, only the index of refraction of one of the boundaries
is known in my statement above. The index of refraction of the second
boundary is unknown, i.e. only the impedances at the two-port network
are known - the load is unknown.

No question that rho is the end result of a ratio of impedances. It's
been my view that, like the V/I ratios we were speaking about, rho is
not a cause but a result.

But earlier, I thought you said rho caused a result.
--
73, Cecil http://www.qsl.net/w5dxp



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