-----Original Message-----
From: [email protected]
[mailto:[email protected]] On
Behalf Of Charles Elliott
Sent: Wednesday, 1 August 2012 8:26 AM
To: 'Will Shackleford'; [email protected]
Subject: Re: NTP on local networks
Unruh had the correct advice: Buy a (cheap) GPS device for a master
clock and propagate the correct time. If something is worth doing, it
is worth doing right. Become a force, develop a reputation, for
progress, one of the foundations of Western Civilization.
The new BU-353, not the old one you can find for about $30, but the one
that costs about $42, at USGlobalSat.com will do the job within a half
second or better, and it is trivial to set up. All you need is a free
USB port and a window, or preferably a thin roof, that faces the
satellites. The Sure (search for Sure Electronics) GPS demo board is
supposed to give much more accurate time, but it is a pain to set up.
There are beaucoup people on this list that know a lot more about GPS
clocks than I and most are willing to help, if you just ask. Meinberg
at www.meinberg.de sells lots of very accurate clocks, and there are
several other places like it. Search for GPS clocks or NTP clocks.
Charles Elliott
This post never made it to the newsgroup, so perhaps the gateway is
stuck or very slow?
I have information on my Web site on the easy-to-use Sure GPS, as well
as the low-cost Garmin GPS 18x LVC.
http://www.satsignal.eu/ntp/Sure-GPS.htm
http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm
Mine are using simple puck antennas, indoors, on the top floor of a
two-storey building. Be aware that USB-connected devices will give far
less accuracy than serial-port connected ones, but may be adequate if
"half-a second" is all you need.
--
Cheers,
David
Web: http://www.satsignal.eu
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