JC - EA2KV
Tks. Will try with Park freq.
The heat sink is already installed on the crystal and the U3s is inside his black Al box.
The point is that the drifting seems never ending even outside RX windings.
Tks to you too. The Unit has been running during three days. ,means lots of calibration cycles.
I even tried with Cal Step Time: 10 - 240, or 30 - 240, you know.... faster freq ref change but never findind a point arround where to be +/- stable inside the RX window.
73 - ea2kv