For my new NanoVNA-H, marked version 3.5 on the plastic parts case, at one time I found a menu display showing options for a choice of frequencies going down to 30 Hz, which I assumed was "resolution bandwidth". I do not recall whether I found this before upgrading the firmware from the supplied one to the 1.0.64 version. When I selected 30 Hz the sweep was much slower, which would accord with what I have seen with a spectrum analyzer when finer resolution bandwidth is selected. I am now unable to find the menu tab that provides this choice of frequency options. Can anyone tell me how to get to that menu item and what exactly it provides if not "resolution bandwidth"? Thank you.
