Philip M. White wrote:
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I've been following the conversation about Pakistan and the evolved
discussion about satellites, jitter, etc., and I've seen similar threads
in the past.
However, I've not been able to find a discussion about the best time
source, assuming one is in the U.S. I know that jitter is bad, but many
GPS sources, especially USB-connected, are very bad when it comes to
that... and yet supposing that I am ready and willing to spend money on
purchasing a GPS that my computer, ntpd, and the pool will love, I have
no idea what to get. Also I'd rather avoid having to solder and
whatnot -- I know that there are "bare" GPS devices with just a raw wire
hanging out of them, but I am probably not hardcore enough to deal with
it.
Can anyone recommend some devices that are ideal for our purpose and
reasonably straightforward to set up?
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Philip,
Whilst it does involve a little soldering, the Garmin GPS 18 LVC is well
worth a look. Here's my story:
http://www.david-taylor.myby.co.uk/ntp/FreeBSD-GPS-PPS.htm
and I'm seeing in the order of 10 microseconds jitter - see the top PC at:
http://www.david-taylor.myby.co.uk/mrtg/daily_ntp.html
Bare-wire GPS is the way to go.
Cheers,
David
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