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Jim,

Here is what Rune had to say about this in previous posts....

From his github -
"Before using NanoVNA-Saver, please ensure that the device itself is in a reasonable calibration state. A calibration of both ports across the entire frequency span, saved to save slot 0, is sufficient. If the NanoVNA is completely uncalibrated, its readings may be outside the range accepted by the application."

Other comments from this thread... /g/nanovna-users/topic/47415385#6642

"My personal preference is to have Cal 0 be full span, and then
making a calibration within NanoVNA-Saver, using the calibration assistant,
with the "Segments" count set to perhaps 10 or even 20 - which gives you
1010 or 2020 data points for the calibration. This calibration can be full
span, or for the range you are interested in. You can then save this, or
any other calibration you make, as files which you can name more
intuitively than "cal 0", "cal 1" etc. ;-)

It's worth noting, that any calibration in NanoVNA-Saver is in reference to
the particular calibration done on the NanoVNA: So if you re-calibrate your
NanoVNA, your NanoVNA-Saver calibration ceases to be valid, and may give
incorrect readings."


Roger