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I just acquired a NanoVNA-H4. My main use will be as an amateur radio antenna analyzer. S11 measurements for HF through 450 MHz, particularly 2m and 70cm, where I have no tools other than an analog SWR meter. I have seen articles and videos where people calibrate the NanoVNA once from 50 kHz to 900 MHz, and leave it at that. I have also seen articles where people claim that you must re-calibrate every single time you change the frequency range. This seems like overkill for my uses. I see very little difference in the SWR, reflection loss and Smith chart readings between the C0 factory calibration and my own 2 meter band calibration. The HF readings I've done so far agree with my RigExpert HF-only analyzer.

My current thinking is that I should be fine with a calibration for 3-30 MHz and another for about 100-500 MHz, or maybe split the latter into two calibrations for 2m and 70cm. But maybe you folks know better. Please enlighten me. Again, I'm talking about real-world ham radio antenna tweaking, not theoretical physics.

Thanks and 73,
--Peter