Hi Magnus, Life speed, what does accuracy mean? Average (rms, 1-Sigma) frequency accuracy? If yes, over what time frame is the average? Or is this the peak to peak allowable deviation? Over what temperature range, and after how long of a warmup? To give you an example, a typical Fury desktop unit with DOCXO is capable of better than 2us holdover drift per day after 3 to 5 days of constant operation. That equates to an average frequency accuracy over one day without GPS of <2.3 x 10^-11. With GPS the accuracy on average is better than 2E-012 after about an hour or so averaging. bye, Said In a message dated 4/20/2010 13:07:53 Pacific Daylight Time, mag...@rubidium.dyndns.org writes:
life speed wrote: > Time Nuts; > > I have a customer request for a microwave frequency synthesizer with extreme accuracy requirements; > 4 X 10^-11, or 0.04 PPB. Obviously this is way out of quartz oscillator territory. > Is GPS 1 pulse-per-second useable, or do they need an atomic clock? > Maybe they don't realize what they are spec'ing. I really think you should ask them to motivate themselves on that spec, the intended use etc. They can certainly get a spec like that, but is it what they need? You certainly want something like a GPS clock to feed that thing if they really need that level of accuracy. Or do they only need that level of resolution? Cheers, Magnus _______________________________________________ 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.
