On Tue, 17 Sep 2019 at 04:00, Dana Whitlow <[email protected]> wrote:
> The nice thing about a Rb is that its short term stability (seconds to > minutes and perhaps > even longer) is much better than that of a GPS timing receiver. The bad > news is that Rb > standards exhibit long term frequency drift in the neighborhood of a few > parts in 10^11 > per month. A pretty fair compromise is to use an Rb standard that is > disciplined by GPS > PPS pulses with a loop time constant on the order of a day or so. > > Dana (K8YUM) Is there any advantage in using a GPS Rb disciplined oscillator vs a GPS disciplined high quality OCXO like the HP 10811A? I can’t understand why there should be, as a Rb source would use an OCCO in its output stage Therefore in each case * Short term stability depends upon the quality of the OCXO * Long term stability depends upon GPS. Perhaps there’s is period over which the the overall stability can be improved by adding a rubidium oscillator. I would be interested to know if that is the case or not. Dave > -- Dr. David Kirkby, Kirkby Microwave Ltd, [email protected] https://www.kirkbymicrowave.co.uk/ Telephone 01621-680100./ +44 1621 680100 Registered in England & Wales. Company number 08914892. Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
