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. -- eric
On Mon, Jun 13, 2011 at 3:45 PM, Jason Rabel <ja...@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: > > http://www.rabel.org/pics/Net4501-2.jpg > > > Here's an article I wrote building one with a UT+ receiver.. Took a little > more work but results are the same: > > http://www.extremeoc.com/articles/howto/Building_S1_NTP_Server_1.html > > > John's article is also a good read: > > http://www.febo.com/pages/soekris/index.html > > > 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. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.