[ntp:questions] site with lots of GPS's and accessories

Alby VA albyva at empire.org
Mon Mar 19 15:24:55 UTC 2012


On Mar 19, 2:45 am, unruh <un... at invalid.ca> wrote:
> On 2012-03-19, David J Taylor <david-tay... at blueyonder.co.uk.invalid> wrote:
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> >> Hi all,
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> >> I was doing some GPS research and found this site with lots of GPS's and
> >> accessories.  Just thought I'd pass it along.
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> >>http://www.gpssensors.com/
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> >> I don't know which ones are timing GPS's.
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> >> Sincerely,
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> >> Ron
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> > Ron,
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> > The one I recognise as being a timing GPS with PPS and suitable for NTP is
> > one which isn't one that page, but here:
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> >  https://www.starlite-intl.com/Detail.asp?pid=2320
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> > Same company.  US $61
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> Certainly the 18xLVC has a PPS pulse, as does the 18x-5 OEM which is a
> 5PPS. It give about 1us accuracy, not 10ns which is what some might call
> timeing GPS. But that 1ns is pretty useless for computer timing, since a
> computer really cannot use better than about 1us accuracy.



 I'm getting 1us accuracy from my Sure GPS once I did the proper Mods
per David Taylor's notes.

URL: http://godzilla.empire.org


assID=0 status=0415 leap_none, sync_uhf_clock, 1 event,
event_clock_reset,
version="ntpd 4.2.6p5 at 1.2349-o Mon Feb 20 22:00:33 UTC 2012 (1)",
processor="amd64", system="FreeBSD/9.0-RELEASE", leap=00, stratum=1,
precision=-19, rootdelay=0.000, rootdisp=0.401, refid=PPS,
reftime=d311cdf2.ee1ec49a  Mon, Mar 19 2012 11:23:30.930,
clock=d311cdfe.0179ea2d  Mon, Mar 19 2012 11:23:42.005, peer=21829,
tc=4, mintc=3, offset=0.000, frequency=-24.622, sys_jitter=0.002,
clk_jitter=0.002, clk_wander=0.001





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