Hi Runs of ten days are not at all uncommon. Since GPS has some 24 / 48 hour "bumps" in it, you will get better data with a month long run. You need at least 10X (and preferably 100X) the data span relative to the "stuff" you are looking for.
Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Chris Howard Sent: Monday, February 04, 2013 6:40 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] measuring my GPSDO : length of TimeLab run? I took my recently acquired cesium clock to the hamfest in Jackson, MS a couple of weeks ago in the hope that I could cash in big and retire in splendor. But no one bought it. So, instead I spent some of my hamfest earnings on a GPIB/USB dongle and I've been using TimeLab and looking at the VE2ZAZ GPSDO that got me into all of this in the first place. The numbers I get are very gratifying. The GPSDO seems to work better than I expected. This is really cool. But I have a question. The GPSDO is set up to do a potential correction every hour. It seems to me that a TimeLab run of less than X hours will only be measuring the fine properties of the oscillator and not the whole system. The question is, how many hours of data collection are needed to capture a characterization of the GPSDO as a whole? What do people to with Thunderbolts and other similar systems? Chris Howard w0ep After I get done playing around with this cesium standard I still think I would like to sell it. I would like to get enough out of it to buy an Elecraft K2 with some of the options. I don't really know if that is realistic. If anyone has comments on that plan, would also love to hear them. _______________________________________________ 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. _______________________________________________ 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.
