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I translated and placed a copy of hugen's August 2nd firmware release notes in the Files section. The latest '20190802' releases are here:

For every upgrade you need to calibrate it. Before any calibration, you need to reset the calibration data. Once saving the calibration to position 0 (zero) it will always load that calibration data.

Got it. Thanks. The 800 MHz ch now shows going to 800 MHz. It has another issue though. Spikes are all over and go all the way to the top of the screen when no load is attached. Looks OK with 50 Ohm

That is expected Peter. Have you got the imaginary parts or phases? Best to plot on a Smith chart too and see how your samples rotate from low to high frequency.? 1.02 swr corresponds to about 40dB

Hi, Please check here: https://drive.google.com/drive/folders/1IRz6E1wlkRyV0u7sbqj0lhWST-GV1szY [image: image.png]

Hi Jim I think we're all struggling to identify and track the different versions of the firmware. I suspect they're all ones written by Hugen who wrote them for the version he sells at

Very interesting results Peter. It prompted me to check out the various dummy loads I have with my multimeter. The decent ones with N type connectors came out at 50 ohms +/- 0.2 ohms, which might

Hi SPACE OPQA, Thanks for the info. Where is the August Version? Thanks, Jim K.

Hi Mike, Thanks very much for that information. The 800 MHz aa version of the firmware corrected the problem. The 800 MHz ch version did not. In fact the 880 MHz ch version still goes out to 900 MHz.

Resending from website as it didn't seem to go through as a message. Also my pasted table from Excel lost formatting so I tried to fix it to be more readable. I just did some very simple resistance

I just did some very simple resistance and SWR measurements using a HP 8753ES and 85046A. I did a very basic one port 3 point cal using a Anritsu OSL which is specified to over 3 GHz. I took

Bob, In case you need to enter the frequency manually, select stimulus as stated, then after you select what you want (start, stop, centre, etc) and the Freq appears across the bottom of the

Hi Jim The 800MHz versions of the firmware are the ones that avoid glitches at 300 and/or 600MHz. The design seems to be based on pushing chips beyind spec and using harmonics of the oscillator signal

The screen is touch sensitive. Tap it to bring up the home display menu. Select “stimulus”. That’s where you enter the frequencies and other information. You can also push down on the jog wheel

OK, so please try the 800Mhz version. Its used for high temp. Will also eliminate some harmonics. Hope it helps... There is a August version already. Cheers!

Yes, I did reload firmware with nanoVNA_900ch_20190722.dfu Forgot to mention that earlier. The above firmware did help on one I got earlier with a lot lower spike but did not help much on this one.

Certainly reasonable questions. I would add entering frequencies and other entries. I am new to the NanoVNA but not network analysis. Stuart K6YAZ

Hello, Have you tried to upgrade (firmware) your unit? That issue was already addressed. Cheers! LL

I just received a NanoVna from Amazon (AURSINC). It is a black one with the shields. The receive side shows a signal at 300 MHz with input connected to dummy load. The signal is so strong that it

The stl files can be downloaded from Thingverse. There are now 2 designs: https://www.thingiverse.com/search?q=nanovna&dwh=645d49dcb550771 Cheers, Larry