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How do I configure a NanoVNA v2Plus4 to check a 1:1 Balun?

According to the NanoVNA V2 documentation, isolation calibration is already done when you calibrate your OPEN and LOAD standard: Note: on NanoVNA V2 Plus4 and later hardware, isolation calibration is ...
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Using PVC coated solid-core wire for a small number of turns on toroid

You should be fine with the hookup wire for all the reasons you note. Another item to take into consideration is the additional distance of the wire from the toroid, but for this application it ...
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