Hi, The delay circuit consists of toggle switch increments of 1 thru 180 degrees in binary steps (using differing lengths of miniature coax cable) as well as a fine adjustment that consists of a couple transistors with varactors. These are built into the unit inside sealed cases and with the unit in the rack with covers on the drift is minimal. (I don't ever turn the unit off) I have made plots of oscillator 1 against oscillator 2 and get a 1 second stability of around 3.50 X10-13th. Will be making some more measurements between an HP 5065A and HP 5071A high stability. Corby ____________________________________________________________ Come clean with a brand new shower. Click now! http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTGcgxgbFBBrsXnexqhVPII1HqjSxmV3sZXXiyKXmSrqeqvyKhcPgU/

Hi Corby, Are you still fixing sick FTS and HP Rb's? Best, -John ======== > Hi, > > The delay circuit consists of toggle switch increments of 1 thru 180 > degrees in binary steps (using differing lengths of miniature coax cable) > as well as a fine adjustment that consists of a couple transistors with > varactors. These are built into the unit inside sealed cases and with the > unit in the rack with covers on the drift is minimal. (I don't ever turn > the unit off) > > I have made plots of oscillator 1 against oscillator 2 and get a 1 second > stability of around 3.50 X10-13th. > > Will be making some more measurements between an HP 5065A and HP 5071A > high stability. > > Corby