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.
I have a 2-2 version. In the previous firmware i have a menu in calibrate section called "correction". How is the diference when activate? is the same as the "apply" button in the latest version? I see that not show the srw correctly (always aprox 1.7) an the reception on port 1 are too irregual. How is the corret mode in each firmware (correction and apply ítems)
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