"Cecil Moore" wrote in message
.. .

The actual SWR on a lossless line doesn't change. Yet, in another
posting, I showed that moving the Bird 1/4WL closer to the load
caused a reported SWR change by the Bird from 1:1 to 2.25:1. How
could both results possibly be right?
--
73, Cecil http://www.qsl.net/w5dxp

The Bird does not know squat about transmission lines, foreward, or
reflected. It only cares about impedance. If you connect a 50 Ohm load to it
through 1/4 wave of 75 Ohm coax, the impedance the Bird sees will be
transformed to 112.5 Ohms; hence the 2.25 SWR. (Actually, a 2.25:1 impedance
ratio)

I have a computer simulation of that type of meter, which lets me do things
you can not do in the real world, for instance having a 50 KW source on each
side of the meter. It can separate out the signals in the two directions of
transmission, but only when it is terminated in 50 Ohms, when there are no
reflections.

Tam/WB2TT