GoForSmoke and Paul__B, you didn't address the issue of the voltage, 5 vs 3.3 V and I don't understand if I can get a reliable Arduino PCB somewhere which would accept the 3.5 x 2.5 TCXO with the proper pinout. Paul__B when you say that removing the original and connecting the pads is difficult what do you mean? too difficult for somebody who has never done it? I was thinking of destroying the original on a milling machine and then soldering the new one with a small 10 W iron. p.-