It's in my opinion the dark side of the project because it's a bit difficult to understand for newbies.

There is several ways to calibrate the radio and not easy to understand.

Finally, as you know Here, there is a WSPR beacon function inside the uBitx. So I red the blog post of KD8CEC and decided to try it with WSPR reports.

Here is the link of the post of KD8CEC : KD8CEC post

So, for making some calibration, there is a formula :

875000000 / Test Frequency * Error Hz ⇒ Calibration value

(Before Calibration Value + Adjust Calibration value = new Calibration value)

(Please read the whole article of KD8CEC, it's well explained).

So, I've tried this this a spreadsheet to make the calculations with the mean frequencies and you will find this in the DropBox folder of the whole project with the filename Master calibration.ods.

It seems to work a bit, but in fact the values are sometimes not repeatable.