On Thu, Aug 4, 2022 at 10:24 AM, 0root wrote:
What do you guys make of these calibration boards?
Accurate enough to give a result with <3% differences?
That is NOT a calibration board. That is a DEMO board. Those are good enough to show a VNA newbie: What would a parallel resonant circuit look like on a VNA? What would a series resonant circuit look like? What would a low pass filter look like? What would a high pass filter look like? What would an attenuator look like? That's all they are good for. They aren't calibration standards by any stretch of the imagination.
The various NanoVNAs are fine for ham/hobbyist use. I will agree with John Gord that your best investment is probably education. W2AEW has a number of good YouTube videos, as does W0QE:
Jim Allyn - N7JA