Brooks Shera's article on the GPS-Based Frequency Standard appeared in the July 1998 QST. A brief description is on his web page at: http://www.rt66.com/~shera/ and a pdf version of the article is at http://www.rt66.com/~shera/QST_GPS.pdf I did an Alta Vista search for "GPS-based frequency" and came up with a source for PC boards for the project at http://www.a-aengineering.com/gps.htm Lyle, K0LR