Have been using my nanoVNA-H to tune my antennas for the lower bands in ham radio for over a year. It has been a lifesaver! I started to use it recently and it seemed to complete the calibration procedure successfully. I saved the calibration and then connected the antenna to be tested. There was no sweep just one small dot at the lower lefthand point of the screen. Has my unit died or have I inadvertently changed some setting deep in a menu somewhere? I tried pausing and unpausing the sweep but that made no difference. Has anybody experienced anything like this with their unit? Thanks, Stephen KO4CVU