I am new to VNA's, so it may be an operator error. I'm trying to use my NanoVNA, but the SWR waveform line varies about three decimal points, say 1.3to1 to 1.6 to 1 and looks like a jagged mess. It seems to change a lot every time it scans. Currently set up to scan from 3.5 mhz to 4.0 mhz and has 100 peaks and valleys that vary 3 to 4 grid divisions. When trying the Smith chart, it just looks like a doughnut with a hole in it made up of lines going across. It looks like it was made with a spirograph. Nothing smooth about it at all, just a mess of lines. Tried it on two working dipole antennas. This is the VNA with two N style connectors instead of the SMA's. Did I get a lousy knockoff? Is it noise? Or do I just not know how to operate it? It is an SAA-2N version git-20201117-9659de4 built Nov 17, 2020. with FPU
