Theory of portable RF wattmeters

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This article describes the theory behind portable wattmeters such as those manufactured by Bird Electronics Company. Also described is the theory of operation of more conventional SWR meters and reflectometers. Elements, commonly called wattmeter slugs are described mathematically in this paper and the detector paper in the link to the right and here: http://www.k9so.net/?q=node/10
Two independent commonly used methods of frequency compensation are described.

Corrections/additions are solicited

Nov 1, 2009 correction----Typo correction as noted by Thierry, F1HSU: eq(2) should not have the - sign attached. Equation (6)and further conclusions are still correct since (6) did not continue the error and is correct. Thank you Thierry!