Thank you for your kind reply. My apologies for not checking out the "Files" and "Wiki" section. It does indeed have a lot of information and contains my answer regarding the issues with the switch and lots more!
Regarding your points:
1. Answered by WiKi. Thanks.
2. I had a look at the file "nanoVNA User Guide 2019-07-11 (PDF)|" but the settings do not correspond to what I have on the device. There is no RECALL/SAVE item, just RECALL under which there are 4 Recall options 0 - 4. Under CONFIG there is just SAVE which I assumed would save the settings. There is no SAVE 0. Under CAL there are SAVE options with SAVE 0 thru SAVE 4 and which I presumed relate to saving calibration setting profiles. It is possible that I need to update my firmware, but having reviewed that information I am totally confused as to which firmware I actually require? There seem to be various versions by different people and I am not sure which one is the de-facto or "official" version?
My current firmware version is: 0.2.3-1-g145a034
3. Yes, I am aware of the hand effect. I am using a shielded co-ax only 20cm long so the end of the antenna is approximately that distance away from the nanoVNA. The nanoVNA is also shielded well with metal plates front and back so I didn't expect that to be a problem. The guy in the video was plugging antennas directly into the nanoVNA, handling them and moving them about and yet the traces seemed to be rock steady. On mine, the peaks completely shift away from their position when my hand gets anywhere near the unit so was very prone to the hand effect. Looking at the Hardware Versions section on the WiKi, I believe that I do have the genuine article. I avoided the white version and have a black unit like the genuine one in the picture with NanoVNA written in the bold and with the correct font (no rounded V). On the board, everything seems properly shielded. I haven't yet removed the cellophane from the screen.
4. Thanks for confirming that. I will order in the items that I need.
I take your point about the learning curve which is why I was only going through the basics at this stage, i.e. calibration and a quick test following step by step with the help of a video. I just used a couple of my scanner antennas. In time I intend to make a further study. I don't have any other basis for comparison. I was hoping one day to get a spectrum analyser, but can't afford one for now and this nanoVNA should suffice for my present hobbyist needs. Even with the hand effect, I think I have managed to work out the best configuration for my loaded telescopic whip to pick up the frequencies of interest on the scanner, although it would have been much easier and more accurate if the trace remained steady.
Incidentally, I tried the Web client on my PC but without success. Firefox just gives a blank screen. With Chromium I was able to get to the web page at and it showed part of the menu with most of the options greyed out and blank frames. When I clicked Connect for the first time it listed a virtual USB device and paired it, but, I then got: "failed to open: Error: failed to open device". Unfortunately there is no troubleshooting info on the authors website and I couldn't find anything more generic elsewhere, for example on Google Chrome or Chromium. There is helpful information telling you how to pair and connect, but not in relation to this error, so any help here would be appreciated. Since I'm on Linux, I will probably also have a look at NanoVNA Saver.
John.
