NanoVNA-F
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I bought a “fake” NanoVNA-F in my early days as an amateur radio operator and I therefore bought this model from SYSJOINT.
I had to replace one SMA connector because it had wiggly contacts.
I wouldn’t buy any device from SYSJOINT again. Also software wise.
Update: I’ve changed one SMA connector and most problems are gone but sometimes the curve still flickers and moves a little bit.