Hi there,
On Mon, 13 Aug 2012, Chuck Swiger wrote:
On Aug 13, 2012, at 11:52 AM, AlbyVA wrote:
My NTP server is running with a Sure GPS as my Stratum-0 device and I'm
able to get microsecond level of accuracy. Averaging an offset of +/- 10?s.
So I'm wondering, what device out there (that is "reasonably priced") will
provide nanosecond level accuracy?
Well-made rubidium oscillators can be on the nanosecond level. Something like
the
Symmetricom SA.35m goes for a grand or so on EBay; probably quite a bit more
when new.
Be aware that the rise/fall time of the pulse is around 10ns, and most
consumer-grade
hardware won't be able to service an interrupt nearly that quickly, so it will
be seriously hard to get better accuracy than in the 10's to 100's of
nanoseconds.
Be aware also that light travels about a foot in a nanosecond. So
is it a nanosecond past ten on this side of the room or that side?
--
73,
Ged.
_______________________________________________
pool mailing list
[email protected]
http://lists.ntp.org/listinfo/pool
