Hi Not to pick nits, but 7 decimal places at what input frequency? Seven places is 10 ppb at 10 MHz. If the input was 100 MHz, it would be 1 ppb.
The distinction is significant, since it crosses a boundary. At 10 ppb a free running Rb is fine with no adjustments. At 1 ppb, some adjustment might be needed. You might also want a standard that's 5X better than the expected result. That would get you into the 2 to 0.2 ppb range. Lots of fiddly little details... Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Russ Ramirez Sent: Wednesday, January 23, 2013 11:48 AM To: [email protected] Subject: [time-nuts] Least costly 10 MHz reference solution Greetings, I have been reading what I can find on Rubidium and GPSDO approaches, but there are some fine points that do not make it clear which is the best 'bang for the buck' solution. My requirement/desire is to have a 10 MHz standard for my lab that I can trust to an accuracy of 7 decimal places (10 ppb?), so anything that is good to a few ppb is certainly adequate for what I am looking for. I have a OCXO unit that is voltage adjustable - for example, adjusting this to 10.0000000 MHz per my HP 5334A requires -12.71V. So the simple (maybe) question is, should I go for a Rubidium disciplined unit, or go with a home-brew GPSDO solution using the Vectron OCXO I already have? My main cause of confusion is ignorance concerning all the GPS solutions out there with 1pps outputs, to use in a GPSDO, and which ones jitter too much to be useful (solutions under $50 exist). Thanks in advance. Russ K0WFS _______________________________________________ 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.
