Claude, Turn TECH MD on in the CONFIG menu first and then you will see it. 73, Don W3FPR On 11/22/2010 9:57 AM, Claude Du Berger wrote: > Hello Group > I want to calibrate my K3, presently about 10Hz off. > I want to use method 2 in page 50 > I can not find CONFIG:REF CAL in the menu... > >