If you need that kind of timing accuracy in the absence of GPS then Cs is probably the only answer. Dark fiber would also work but the infrastructure and fiber leasing costs would probably be much more expensive than local Cs Sent from my Verizon Wireless BlackBerry
-----Original Message----- From: "Ralph Smith" <[email protected]> Sender: [email protected] Date: Thu, 9 Sep 2010 12:48:54 To: Discussion of precise time and frequency measurement<[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Timing Distribution in Mountainous Terrain The network is spread over about 250-300 US miles. Ralph On Thu, September 9, 2010 12:01 pm, Didier Juges wrote: > How widely spread is your network? > > ------------------------ > Sent from my BlackBerry Wireless thingy while I do other things... > > -----Original Message----- > From: "Ralph Smith" <[email protected]> > Sender: [email protected] > Date: Thu, 9 Sep 2010 11:37:46 > To: <[email protected]> > Reply-To: Discussion of precise time and frequency measurement > <[email protected]> > Subject: [time-nuts] Timing Distribution in Mountainous Terrain > > We have a requirement for approximately ten radio sites to be synchronized > to within 30 ns of each other. Ordinarily you could throw in an > appropriate GPSDO and be done with it. However, we also have the > reqirement to be able to operate independent of GPS for up to six days. If > we were able to have each site within line of sight of another, and could > form a network including all sites, we could do differential time > measurement between the mutually visible sites and correct in that way. > Unfortunately, that is not the case. Absolute time accuracy is not > critical, but relative time accuracy is. Does anyone out there have any > ideas? > > Thanks, > Ralph > AB4RS > > _______________________________________________ > 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. > _______________________________________________ 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.
