Hello y'all, (maybe I should say Ho Ho Ho...) John was very kind and sent me the latest version of the Crystal Oscillator tutorial. It's at http://www.ko4bb.com/Timing/Vig-tutorial_8.5.3.6_-_Jan <http://www.ko4bb.com/Timing/Vig-tutorial_8.5.3.6_-_Jan 2007_-_compressed_pics.ppt> 2007_-_compressed_pics.ppt Didier KO4BB