Richard Harrison wrote:
Cecil Moore, W5DXP is alleged to have written:

Actually, it was Jim Kelley who wrote the following.

"Nor will we find a negative scalar quantity accompanied by the claim
that the negative sign indicates a change in direction as you have
done."

Have not read Hecht, but I`ve read Terman and realize that a
transmission line can guide a wave only forward and backward. Sometimes
backward is considered the negative direction.

Yep, that's what I told him. In fact, Ramo & Whinnery illustrate
the Poynting vector for forward power as Pz+ and the Poynting
vector for reflected power as Pz-. The net power is (Pz+)-(Pz-).
--
73, Cecil http://www.qsl.net/w5dxp


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