Richard Clark wrote:
What does your software report for calibrating a software 40 Ohm line
feeding a software 50 Ohm load?

It doesn't report that. It is a data reduction, curve fitting program.

What does your software report for calibrating a software 50 Ohm line
feeding a software 50 Ohm load?

It doesn't report that. It is a data reduction, curve fitting program.
The only input to the program is your data.

Consider that with your 16.67 ohm load, the impedance 1/2WL away from
the load should repeat. But the minimum reflected power point indicates
a load of about 25 ohms. So there's one error already, perhaps caused
by the diode. If you plot your data as SWR points on a 50 ohm Smith
Chart, it is obvious that the SWR circle (spiral) is compressed at the
lowest reflected power readings. It is also obvious that the center
of the SWR circle is not the center of the 50 ohm Smith Chart. That's
a pretty clear indication that everything is not 50 ohms. If full scale
on the Bird is 5 watts, the readings can be off by 0.25 watts. 0.45
watts plus or minus 0.25 watts is not very accurate.
--
73, Cecil http://www.qsl.net/w5dxp



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