On Wed, 06 Jul 2005 17:17:17 -0700, Wes Stewart
wrote:



I think "Computation of Impedance and Efficiency of Transmission Line
with High Standing-Wave Ratio", W.W. Macalpine, Transactions of the
AIEE, vol. 72, pp 334-339; July, 1953 might be of interest to you.

The same reference is used as the basis for the section
"Transformation of Impedance on Lines With Highh SWR" in the ITT
handbook.

Yes, I saw (and I think, understand) the formulas under the heading
"Power and Efficiency" in my ed #6 of the ITT H'book.

Not wanting to express the algorithm in pseudo code (AKA ugly ASCII
math) here, 'cos it *will* be unreadable, I have pasted the formula I
have worked up, and a plot of it in a particular scenario at
http://www.vk1od.net/temp/LineLoss.htm .

Given, that to support this, there is are functions for Gamma(load)
and Gamma(x), it is a whole bunch of code, and Michaels approach is
attractively simple, and it produces exactly the same answer on this
scenario.

Owen
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