Team Nutters, GPSDO's are often specified for stability as so many parts per x. Using a Symmetricom 8040C as an example, this has a quoted accuracy of typically 5E^-11 at shipment. Ageing (monthly and yearly) and ADEV stability rates for 1, 10 & 100 seconds are also given. This particular device as 1, 5 and 10 MHz outputs.
The question - is this "accuracy" with respect to 1Hz - or 10MHz ? If the latter, then the accuracy figures quoted needs to be modified by 10^6 (Hz to MHz) to get a feel for the actual frequency changes at 10MHz. Glossies of many GPSDO manufacturers seem deathly silent on this point, so clearly, "something is assumed". I have seen an oscillator comparison chart by Meinberg (a German company) that in their comparison chart, the accuracy references need scaling to relate to 1Hz. Appreciate some advice and/or direction on this before madness overtakes me ! Kit Canberra Australia _______________________________________________ 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.