Le 17 mai 2013 à 06:45, Grant Waldram a écrit :
> This is inside a security-fob protected room. I > can't get GPS signals in there, and the Australian radio clock network was > shut down about ten years ago. Our CDMA network was turned off in 2008. > Right now all I can think of is GSM, and while i know it's not terribly > accurate it seems like it might be the easiest. It also might be that I've > got tunnel vision and there's a simpler solution out there. > It may be that you can receive the Japanese time service JJY at 60Hz or even WWVH, for which receivers are available. If not then I guess it means how deep are your pockets. GSM would mean that a call in/out would be possible which s not secure though GSM routers are available with an NTP service. Otherwise you are looking at a homebuild or bought NTP server with a sufficiently stable time source, or rather at least 3 of them. Remember that a man with 1 clock only thinks he knows what the time is, one with two clocks has no idea. > I would be quite happy with some sort of dedicated GSM/NTP-server box, and > there are Arduino/Raspberry Pi/Linux homebuilts for that out there, but I > have been wondering if one of the fairly common GSM USB sticks could somehow > be a time source to set the server clock? > > > > Regards, > > > > Grant > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.