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edy555, the original NanoVNA designer, quietly shared a photo of his NanoVNA2 PCB on Twitter without any additional details (see attachment).

- Herb

Hmm... interested to know what's going on with the void in the PCB. Likely to do with the directional bridge, but what?
/ Gerry

Perhaps a ferrite core like the EU1KY analyzer? IDK

That ferrite is before the input though... this seems to be after it.

Probably as balun to provide the bridge with balanced input or to convert the bridge balance to the reflection receiver

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Erik, PD0EK

A reflection bridge like this.

That is what I suspected, hugen.

you will probably use such a return loss bridge

Appears to be just existing nanoVNA with the addition of a balanced to unbalanced balun on the bridge Rx sens output. . Not to be confused with the high freq AD8343 mixers, ADF4350 synth version previously described as V2 model.

Naming is going to create confusion with various models.