Beware of cheap underperforming clones

As of 2022 there are many badly performing clones on the market. V2/3GHz NanoVNA uses parts like ADF4350 and AD8342 which are costly and clones have been cutting costs by using salvaged or reject parts.

See official store and look for V2 Plus4/V2 Plus4 Pro versions only to avoid getting a bad clone. We have stopped selling V2.2 versions since October 2020, so all V2 hardware that are not Plus or Plus4 are not made by us and we can not guarantee performance.

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https://ojisankoubou.web.fc2.com/, revisited

John Gord 2020/09/03 15:33

I have been using this firmware ( https://www.dropbox.com/s/0fgdya5k2qrmsnu/binary20200717.bin?dl=1 ) on my V2, and have been very favorably impressed.

Nice features:
Smaller frequency steps above 140MHz: 6kHz at 4GHz, 3kHz at 2GHz, ......, about 400Hz at 150MHz (Factory firmware had 12kHz steps)
Interpolation of calibration, auto startup with Cal 0
Adjustable bandwidth from 3kHz down to 10Hz
Adjustable averaging
Display color control

The only feature I would really like to see added is true CW generation.

--John Gord

On Fri, Aug 28, 2020 at 04:25 PM, John Gord wrote:

- Show quoted text -
switchabl 2020/09/03 15:50

This is interesting. Here is the source code: https://www.dropbox.com/s/atitdjud9h9d0lb/NanoVNAv2-release20200619_20200717.zip?dl=1
Maybe some of this can be merged into the official firmware. Since it is GPL, that should be fine. But it would still be polite to ask first.

I disagree somewhat with loading cal 0 automatically though. I would much prefer to have a high-resolution "base calibration" that is loaded automatically (and takes a few more button presses to change), but still shows as uncal.

And I still want proper calkit definitions. I will probably tackle this when I find some time.

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