> Second, it is almost impossible to actually be > certain that a 20M > crystal is oscillating on frequency. Why is it so? I used a scope frequently across the crystal to view the freq it is running at. John ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist