Mark,
Bob is right, especially if you are doing measurements right at the NanoVNA connector. The interpolation of calibration points taken over a wide span works pretty well if connection lengths are short. Interpolation does not work so well when calibrations are done at the ends of relatively long cables. In those cases you will want to calibrate for the frequency span under use.
--John Gord
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On Sun, May 17, 2020 at 10:26 PM, Bob Albert wrote:
You don't have to keep recalibrating.? Once done, you save the parameters
and recall it each time.
Just do the calibration over the entire frequency range and you are done
calibrating.
Bob
On Sunday, May 17, 2020, 10:02:38 PM PDT, Mark Schoonover
<mark@...> wrote:
Put my new nanovna-H4 to work this afternoon tuning up a new MFJ Cobweb.
Prett amazed at this $50USD device. Every time I changed bands I did a
calibration. When I had an antenna analyzer I never had to do a cal. The
analyzer I had did impedance as well as SWR. Why is this?
73! Mark KA6WKE
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