My 2012 Mac mini running 10.13.3 keeps within a few tens of milliseconds every time I check. It uses Apple's own time servers, in my case time.euro.apple.com
Works for me, 73 Stephen G4SJP On 20 February 2018 at 18:42, Walter Underwood <[email protected]> wrote: > With a terminal window open, run “ntpq -p” to get a list of current NTP > peers and the offset in milliseconds. > > $ ntpq -p > remote refid st t when poll reach delay offset > jitter > ============================================================ > ================== > +10.74.16.53 129.6.15.28 2 u 522 1024 377 25.148 -0.522 > 3.996 > *10.74.16.54 128.138.141.172 2 u 794 1024 377 23.834 -2.152 > 0.769 > > Almost exactly 25 years ago, I wrote a more complicated NTP info script. > At the time “groper” implied that it was groping around in the dark. Times > have changed. > > https://opensource.apple.com/source/ntp/ntp-92.30.1/ > scripts/ntp-groper.auto.html > > wunder > K6WRU > Walter Underwood > CM87wj > http://observer.wunderwood.org/ (my blog) > > > On Feb 20, 2018, at 10:23 AM, Detrick Merz <[email protected]> wrote: > > > > Unfortunately, with some recently releases of OSX, Apple decided to tweak > > the NTP daemon to "save battery power." This results in the clock > drifting > > significantly from our perspective, but "not enough for the average user > to > > care about." It can definitely be enough for JT modes to care about. I > > tracked my clock accuracy at one point on OSX 10.9 (I think), and as I > > recall I saw it drift up to 20 seconds at some points in time. > > > > I'm unsure if it's been improved in the most recent macOS releases, but > the > > idea of forcing a restart of NTP either daily, or whenever you fire up > > WSJT-X, hasn't necessarily been as much of a faux pas as one might think. > > > > -detrick > > K4IZ > > > > On Tue, Feb 20, 2018 at 12:49 PM, Dale Chayes <[email protected]> > > wrote: > > > >> > >>> On Feb 20, 2018, at 12:06 , Walter Underwood <[email protected]> > >> wrote: > >>> > >>> Should not need to unlock and relock daily. In fact, that could hurt > >> time synchronization. > >> > >> Indeed, restarting runs the risk of loosing (over-writing) the > >> calibration (local clock drift rate) that NTP uses to keep the local > clock > >> accurate. > >> > >> From my experience, I would put the idea of “restart every day” in the > >> same category as old guidance about primitive operating systems that > some > >> folks used to recommend re-booting every day in order to prevent > crashes. > >> > >>> Mac OS runs NTP, which continually adjusts the time. > >> > >> I _think_ every modern OS uses an NTP implementation or at least has one > >> available. > >> > >> Some light: > >> https://en.wikipedia.org/wiki/Network_Time_Protocol < > >> https://en.wikipedia.org/wiki/Network_Time_Protocol> > >> and not so light: > >> http://www.ntp.org/ <http://www.ntp.org/> > >> https://www.eecis.udel.edu/~mills/papers.html < > >> https://www.eecis.udel.edu/~mills/papers.html> > >> reading for those who don’t know about NTP. > >> > >> > >> I’d be interested to hear about ones that: > >> a) don’t have an NTP implementation available and/or > >> b) have one that does not work reliably > >> > >> One issue I’d keep an eye on is whether your OS (and it’s NTP daemon) > will > >> tell you if it’s having trouble syncing. > >> > >> With a good NTP implementation, you could go months (or years) with no > >> significant time of day error and then loose your time sync and slowly > >> drift off to the point that it matters for your application. > >> > >> You can also run into this problem if you are off the ‘net and the NTP > >> daemon can’t get to the NTP source often enough. > >> > >> -Dale > >> > >>> > >>> wunder > >>> K6WRU > >>> Walter Underwood > >>> CM87wj > >>> http://observer.wunderwood.org/ (my blog) > >>> > >>>> On Feb 20, 2018, at 8:55 AM, John Stengrevics < > [email protected]> > >> wrote: > >>>> > >>>> Richard, > >>>> > >>>> I run a Mac here. Go to System Preferences, Unlock, enter “ > >> us.pool.ntp.org <http://us.pool.ntp.org/>”, Lock and you will be good > to > >> go. > >>>> > >>>> You should Unlock, delete, and renter the above daily to make sure you > >> are synched - takes 30 seconds. > >>>> > >>>> John > >>>> WA1EAZ > >>>> > >>>>> On Feb 20, 2018, at 11:49 AM, Richard <[email protected]> wrote: > >>>>> > >>>>> Before I get into the list of problems I’m having using WSJT-X FT8 on > >> my K3S, I’d like to know: > >>>>> > >>>>> 1. Is the automatic clock setting in my Mac mini (running Sierra, > >> 10.12) good enough for modes like JT65 and FT8? > >>>>> > >>>>> 2. If not, what’s a good reliable time sync app I can download and > use? > >>>>> > >>>>> Cheers! > >>>>> > >>>>> Richard Kunc — W4KBX > >>>>> > >>>>> ______________________________________________________________ > >>>>> Elecraft mailing list > >>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft > >>>>> Help: http://mailman.qth.net/mmfaq.htm > >>>>> Post: mailto:[email protected] > >>>>> > >>>>> This list hosted by: http://www.qsl.net > >>>>> Please help support this email list: http://www.qsl.net/donate.html > >>>>> Message delivered to [email protected] > >>>> > >>>> ______________________________________________________________ > >>>> Elecraft mailing list > >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft > >>>> Help: http://mailman.qth.net/mmfaq.htm > >>>> Post: mailto:[email protected] > >>>> > >>>> This list hosted by: http://www.qsl.net > >>>> Please help support this email list: http://www.qsl.net/donate.html > >>>> Message delivered to [email protected] > >>> > >>> ______________________________________________________________ > >>> Elecraft mailing list > >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft > >>> Help: http://mailman.qth.net/mmfaq.htm > >>> Post: mailto:[email protected] > >>> > >>> This list hosted by: http://www.qsl.net > >>> Please help support this email list: http://www.qsl.net/donate.html > >>> Message delivered to [email protected] > >>> > >> > >> ______________________________________________________________ > >> Elecraft mailing list > >> Home: http://mailman.qth.net/mailman/listinfo/elecraft > >> Help: http://mailman.qth.net/mmfaq.htm > >> Post: mailto:[email protected] > >> > >> This list hosted by: http://www.qsl.net > >> Please help support this email list: http://www.qsl.net/donate.html > >> Message delivered to [email protected] > >> > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to [email protected] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
