
I purchased a Nano VNA V2 Plus 4 from the Tindie site but I noticed something strange. Below 142 MHz I seem to have a ton of noise in my measurements after an S11 open, short, and thru cal. Has anyone else seen this? I want to make measurements in the 2-60 MHz band but I can't with all the noise. I should have something close to a cluster of points on 50 ohms or short on the Smith Chart after the cal but the trace is all over the place. Calibrations > 142 MHz seem just fine. So I'm confused.
Thanks,
Mike