David Taylor <david-tay...@blueyonder.co.uk.invalid> wrote:
> For Rob, I would suggest that each TX have a GPS/PPS reference with sky
> view, and that each PC was identical (e.g. all Raspberry Pi cards), and
> then getting them synced to with 12 microseconds should be easy. I
Of course that is what we have.
E.g. on a prototype here at home:
ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
oPPS(0) .PPS. 0 l 2 16 377 0.000 0.000 0.000
xSHM(0) .GPS. 0 l 1 16 377 0.000 7.682 0.152
*SHM(1) .PPS. 0 l 16 16 377 0.000 0.008 0.001
PPS(0) is a PPS input from a professional GPSDO connected to a COM port,
SHM(1) is another GPS receiver interfaced via gpsd. Just to see how
close they get and remain.
Not Raspberry Pi (yet) but normal PC systems, but I know it is possible
to get the system time within the desired 12 microseconds.
Unfortunately that is not the same as performing some task like outputting
audio at an accuracy of 12us, but that is the next challenge :-)
_______________________________________________
questions mailing list
questions@lists.ntp.org
http://lists.ntp.org/listinfo/questions
