Martyn, What is the type of oscillator used as the frequency reference of the SR620? How is it characterized?
Didier KO4BB > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Martyn Smith > Sent: Thursday, February 14, 2008 11:36 AM > To: [email protected] > Subject: Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35 > > Pete, > > That's my point. > > Tom has plotted Allan Variance. I have plotted frequency accuracy. > > I get similar Allan Variance results to Tom. But if I just > measure the accuracy, e.g peak to peak frequency variations, > rubidium's out- perform OXCO's even when both are disciplined to GPS. > > I hope I'm not being stupid here. > > I measure frequency accuracy using my Stanford SR620 in time > AB mode and calculate the frequency error. My accuracy floor > noise is 2E-11/sec. > > When measuring an OXCO based unit I often get frequency > errors of plus/minus > 5 milli hertz. Rubidium units (mine and Symettricom) never > has errors > 1 milli hertz. > > Best Regards > > Martyn > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, > go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.516 / Virus Database: 269.20.5/1279 - Release > Date: 2/14/2008 6:35 PM > > No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.5/1279 - Release Date: 2/14/2008 6:35 PM _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
