Before I implemented the "quadratic equation correction" for my QRP reflectometer (mentioned in my post above), I simply used the straight voltage levels from the diode rectifiers in the SWR calculation.? What I found disconcerting was that when I switched my QDX between normal and reduced power (i.e. one third of power) the antenna SWR apparently greatly improved!? Of course that is nonsense and is due to the lower output from the reflectometer diode rectifiers being lower down the "knee" of their characteristic.? I found that using the "quadratic equation correction" caused the SWR indication to be essentially the same regardless of whether on normal or reduced power.? Not so disconcerted now!
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Peter Lee
G3SPL
