[time-nuts] Advice on NTP server needed
wd6cmu at earthlink.net
Mon Jun 13 23:02:01 UTC 2011
Same here, my Net4501 has been running over 2 years without a reset.
A Soekris-based NTP server uses the counter/timer built-in to its
embedded processor to give you better precision interval measurement
than a serial port, but if you're not interested in anything better
than ms accuracy then it's probably not an issue.
On Mon, Jun 13, 2011 at 3:45 PM, Jason Rabel
<jason at extremeoverclocking.com> wrote:
> I have to disagree with the person that said the Net4501 is not stable. I have two (soon to be 3) that run NTPns and they have never
> needed to be touched. I've powered them down a couple times during really bad storms because I didn't want lightning to zap them (or
> my other GPS equipment).
> If you don't have any time constraints, you can watch eBay and usually get a Net4501 for $50 - $75 shipped. You can buy the latest
> Motorola Oncore timing receiver (M12M+T ?) from Synergy GPS, or on eBay the user fluke.l is selling older M12+T models for $35 + $8
> shipping. Get an appropriate cable to go from the GPS unit to your antenna, solder a few wires, and you are good to go.
> Here's a pic of mine with the M12+T:
> Here's an article I wrote building one with a UT+ receiver.. Took a little more work but results are the same:
> John's article is also a good read:
> I have precompiled images of NanoBSD + NTPns on my server if you want to download them (email me off-list for the URLs). One build
> is FreeBSD 6.3, the other is 7. I haven't built any trying newer versions of FreeBSD, I don't think there is really anything to
> except a bunch of build headaches.
> If you want something more plug & play... Watch eBay for "Tymserve 2100", which seem to be the most common. There was a bunch of
> "Spectracom" GPS Time servers that recently sold for ~$100 each IIRC. I don't know if anymore are available. Every now and then an
> "EndRun" or "Brandywine" unit will show up. Other useful keywords to search eBay would be "Symmetricom", "Datum", and "TrueTime".
> Oh, and of course there's the Trimble Thunderbolt... You can hook that up to a PC / serial port as a GPS input. Since it has its own
> internal OCXO you also get some hold-over ability.
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