Jim Kelley wrote:
"Are we then supposed to infer that it (the source) doesn`t re-reflect
the wave if anything other than a short or open circuit appears there?"

The reflection may be incomplete unless either a hard short or complete
open-circuit appears at the source where the generator meets the
transmission line. If the source appears as a complete short or open the
reflection is total.

Best regards, Richard Harrison, KB5WZI.

Richard Harrison wrote:

Jim Kelley wrote:
"Are we then supposed to infer that it (the source) doesn`t re-reflect
the wave if anything other than a short or open circuit appears there?"

The reflection may be incomplete unless either a hard short or complete
open-circuit appears at the source where the generator meets the
transmission line. If the source appears as a complete short or open the
reflection is total.

Best regards, Richard Harrison, KB5WZI.

Hmmm. I wonder if the phase change on re-reflection the same as it does
on reflection. If it does, and the transmission line is a half wave
long, the Bird wattmeter readings would be real hard to explain.

And isn't it true that if there were actually a real hard short or a
complete open circuit at the source, there wouldn't even be a signal on
the transmission line?

73, ac6xg

On Mon, 18 Jul 2005 13:46:02 -0700, Jim Kelley
wrote:

Hmmm. I wonder if the phase change on re-reflection the same as it does
on reflection. If it does, and the transmission line is a half wave
long, the Bird wattmeter readings would be real hard to explain.

Hi Jim,

In fact it is explainable (done it several times here in fact) and is
called mismatch uncertainty which is quantifiable error derived from
attempting to measure power between two mismatches. When the
generator mismatches the line by as little as 2:1 and so does the
load, you are already pushing 20% error.

However, the quantification is resolved through interference math.
No, not like the stuff presented in this "Can you solve this," but
close enough (sans the howling errors of commission).

And isn't it true that if there were actually a real hard short or a
complete open circuit at the source, there wouldn't even be a signal on
the transmission line?

Ah, Reciprocity! The first law ditched over the side when a new
"theory" hits the boards.

73's
Richard Clark, KB7QHC

Jim Kelley wrote:
And isn't it true that if there were actually a real hard short or a
complete open circuit at the source, there wouldn't even be a signal on
the transmission line?

Yep, that's why one cannot use circuit analysis on distributed
network problems.
--
73, Cecil http://www.qsl.net/w5dxp


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