Roy Lewallen wrote:

Dr. Slick wrote:
I disagree on this point. You are caught up in the 50 Ohm world,
which i admit is easy to do. The SWR is based on the ratio of the
forward to the reflected power.

That's not correct. The SWR (more correctly VSWR) is, by definition, the
ratio of the highest to lowest voltages which appear on a line long
enough to have both a maximum and minimum. It can be calculated from the
forward and reverse voltage waves. ISWR, the current standing wave
ratio, is numerically equal to the VSWR.

For Dr. Slick: Knowing the forward and reflected powers, one can use the
following equation to obtain SWR. 'Sqrt' means "square root of".

SWR = [Sqrt(Pfwd)+Sqrt(Pref)]/[Sqrt(Pfwd)-Sqrt(Pref)]
--
73, Cecil http://www.qsl.net/w5dxp



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