Ryan Malayter wrote: > On 10/3/07, John Pettitt <[EMAIL PROTECTED]> wrote: > >> I'm not sure the whole GPS diversity argument holds water. There >> really is no good alternative that provides the accuracy that GPS offers >> (CDMA is GPS and the clock solution don't offer the same accuracy do to >> propagation delays). I'm open to somebody convincing me that there >> is a good alternative to GPS but I've not yet heard a compelling >> argument. >> > > Defore GPS was cheap, the radio codes broadcast by national standards > laboratories provided time for most stratum-1 servers. That would be > WWV and WWVB in the USA, DCF77 in Germany, etc. > > See: http://www.eecis.udel.edu/~mills/ntp/html/refclock.html > > I know, and the accuracy was ~1ms due to variations in propagation delay and often worse due to poor reception during daylight hours requiring the machine to hold over on its internal clock until the radio clock was available again. I've got three radio clocks in my house and all of them will only sync at night.
John _______________________________________________ timekeepers mailing list [email protected] https://fortytwo.ch/mailman/cgi-bin/listinfo/timekeepers
