I haven't watched the video. But it almost sounds as if Dave has=20 discovered another device that can function as an accelerometer. dwayne At 06:57 AM 8/1/2014, Jean-Paul Louis wrote: >Crystal resonance can be affected by many things, and most likely=20 >gravity has a part to play. What he was showing was a deviation of=20 >about 2 or 3 mHz on a 10 MHz frequency. That's about 2.5 x 10 to the=20 >10th power. >Changing the angle of the crystal relative to the gravity vector=20 >might be the reason of the change. --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .