Jon, I searched the Nabble site and found a long thread from June 24, 2010 with the title "clock accuracy". Worth reading through. ----- Brian, op K1NW -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Clock-loses-time-tp7567830p7567857.html Sent from the Elecraft mailing list archive at Nabble.com.