[time-nuts] G3RUH GPS Stabilized Oscillator

[Pete]

Dick,

A newer dual trace 'scope & some patience can tell you a bunch.

A 500Mhz 'scope set to 2nS/div with the 10MHz OXCO outputs on chA & chB, 
triggerred on A (or B) has
a sensitivity of  2E-9/s for the traces drifting apart 1div. If you can get 
both zero crossings on screen (variable delay
line helps) & they appear to be stationary & stay within 1div for 200s, you 
can be pretty sure they're locked.
This should equate to 1E-11/div & the oscillators probably have more 
(uncorrected) drift than that over 200s.

Pete Rawson