[time-nuts] Alternative to GPS?

Henry Hallam henry at pericynthion.org
Wed Oct 6 07:02:51 UTC 2010


On Tue, Oct 5, 2010 at 9:04 PM, Neville Michie <namichie at gmail.com> wrote:
> Hi,
> How far could you get passing time around from amateur station to station
> with a two way handshake system that establishes the instantaneous delay
> on the two way path and assumes a delay of half that value? A time relay.
> The stations would need their own short term clocks so they could keep
> their own time between contacts, and somewhere you would need heros
> with primary standards to synch the whole system.
> You would not be able to find a good position, because you would not know
> the
> propagation mode.

A lot of work has been put into NTP which does a fine job of this and
considers a lot of subtleties.  In practice it has precision limits.



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