Gentleman,

With Carlos KJ6ST permission , I call your attention to an outstanding, well documented, easy to implement, measurement technique.

 https://groups.io/g/QRPLabs/topic/ocxo_short_term_drift/30321721?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,30321721

There is additional setup information in post 3 of his thread.

73
John
N3AAZ