Hej veronica.merryfield@tesco.net. Tack f=F6r ditt meddelande 11:59= 2002-08-12 enligt nedan: >I would make a small LC tank centered at 12Mhz across a scope input with an >arial close to the xtal I suggest a current pickup held to supply trace would pick up stronger= signal, plus not interfere at all with xtal resonance. Problem is finding a good 12 000 000 Hz reference. good Xtal and caps & osc, helt at controlled constant temperature ...but what to calibrate to? /Morgan -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.