I am trying to eliminate a PLL frequency synthesizer by simply switching 2 or 3 crystals into the circuit. Where is a good source for custom crystals in the 3MHz to 4MHz range? SMT crystals would be preferred. In my early Ham days there were lots of places that made custom crystals for the Ham bands in a week or so. I can't seem to find any now. Doug Butler Sherpa Engineering -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.