On Wed, Oct 5, 2016 at 11:01 AM, Tom Van Baak <t...@leapsecond.com> wrote: > Hello again Estanislao, > > Nice set of questions. The short answer is that for a GPSDO, > - The left side of the ADEV plot will show the difference between the quality > of the local oscillator, in your case TCXO vs. OCXO vs. Rb. > - The middle of the ADEV plot will show the difference in the choice of > time-constant or the environmental conditions during the test. > - The right side of the ADEV will show the quality of the GPS timing receiver. > > Also, > - The left side of the ADEV plot may expose limitations in your measurement > equipment or the local low-noise reference that you're using. > - The right side of the ADEV plot may expose limitations in your local > frequency reference. A cesium or H-maser helps here. If you use one GPSDO to > test another GPSDO the very right side of the ADEV plot is misleading. > > See also the examples here: http://leapsecond.com/pages/gpsdo/
Hi Tom, quick question: I've seen these plots before and they are very useful to know what to aim at for GPSDO performance. Am I right in thinking these were measured against a master - the page says " a very stable 10 MHz reference. " without more details (unless I missed it) > > /tvb > Cheers, Tim _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
