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For many many years my N2PK/MyVNA combo has been great.
Recently I have gotten it into a state and not found an exit.

With a short cable from RF Out to Detector 1 and the M2PK ion transmission mode, the sweep looks perfect: flat with loss < .01 dB.

With no cable, the trace is very noisy and loss is just a little more than .01 dB.
The trace looks like the trace normally seen with no input, which normally is -85 to -90 dB.

So the trace seems to be correct but the vertical axis labels were not updated. I tried clicking on AutoScale many times, restting the N2PK, and restarting MyVNA.
I find nothing in Display Options nor in the window that appears after left clicking on the plot.

So what have I done?

Chuck

G'day Chuck.

You probably have the Lock boxes ticked.



I've been caught by this on a few occasions.

Kerry VK2TIL.

Right you are and thanks for getting me un-stuck.
My mistake was concentrating on the Display Options tab.

Thanks,

Chuck