Henry Hallam wrote:
On Tue, Oct 5, 2010 at 9:04 PM, Neville Michie <[email protected]> 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.
yes, but the filter in NTP is somewhat optimized for a kind of
propagation paths (e.g. internet) which have properties that aren't very
much like HF.
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