I think I have one of the original NanoVNA's because I can't do the TDR option with mine and I have tried to do firmware updates to it and that feature still won't appear. Is it just selected few models of the NanoVNA that do the TDR option or can all of them do it? I am just wondering before I go and buy another one so that I have that feature. I have no idea what version I have because everytime I turn it on the screen goes so fast I can't see what the version is.
Richard Dykstra -- N7WFK