Post the graphs or the S21 files from NanoVNA Saver.
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On Tue, 29 Sep 2020 at 12:48, Federico - ik3umt <ik3umt@...> wrote:
Hi, new to this group.
NanoVna ttrftech v. 0.5.4
NanoVnaSaver v. 0.3.7
I'm trying to use a home made fixture for testing chokes via S21
parameters, two short wires exiting VNA ports ending with clips
I've done a S.O.L.I.T. calibration with clips connected each other (thru).
Once calibration is applied and a sweep is done with fixture still in thru
position (as per calibration) , software still shows the variable amount of
reactance and a slight resistance variation across the sweep caused by the
non-50ohm fixture.
Shouldn't I see a flat impedance 50+J0 ohm all along the frequency sweep
instead, due to calibration correction factor ??
Am I perhaps wrong in calibration concept ??
Thank you
Federico
ik3umt
