Re: My Computer Drifts!
David J Taylor
On 04/06/2022 08:31, Dirk wrote:
David, talking about GPS:Dirk,
I think may Linux users would be disappointed to get low milliseconds from NTP
- and Windows makes it much more difficult (although better with Windows 8 and
later). The problem with GPS alone is that while you may get a low deviation,
that deviation is referenced to other than UTC - certainly having a single NMEA
sentence and high baud rate can help. I've seen differences in excess of a second!
GPS alone is not good enough for microsecond deviation, you must have PPS as
well. A GPS over USB, for example, does not typically have a PPS signal, and
even if it does it subject to the USB polling rate (125 microseconds).
Getting good results can depend on pot luck, to a degree, as different network
cards and drivers influence the results. Just for interest:
Windows stratum-1 PPS-synced PCs:
Windows (& Linux) synced over the LAN from stratum-1 servers
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