As some are very interested in that device, here a thread from the SDRplay groups.io

https://groups.io/g/SDRPlayUsers/topic/97122706

Looking at for instance impedance matching of the Bodnar output to the reference clock input.

Yesterday 12-3 we had a Dutch RF-Seminar on using the nanoVNA-H4 for very accurate phase measurement with the new program tinyPFA.
https://www.tinydevices.org/wiki/pmwiki.php?n=TinyPFA.Homepage

So we can continue to pursue absolute frequency accuracy and stability.