[time-nuts] Striking change in iPhone time accuracy with 8.2

Has anyone else noticed a dramatic improvement in the accuracy of time of day on iPhones and iPads since the release of iOS 8.2? The accuracy used to be only plus or minus 2 or 3 seconds, now it is about 100 times better, usually a few tens of milliseconds. I figure Apple might have finally paid so

Re: [time-nuts] Win XP and NIST time

Orin writes: > If you use those, you have to lock the thread you are timing to one > CPU/Core as the performance counters are per CPU/Core and can get > out of step. Or you can force your thread onto one CPU for the > QueryPerformanceCounter call. This seems to be a bad idea to me as > it would ad

Re: [time-nuts] Win XP and NIST time

Chris writes: > For most users I think that is reasonable. It's just not what one > expects to read on a "Time Nuts" list. Here we expect to see posting > from true nut-cases who want microsecond just because they can do it. But how can you verify microsecond accuracy on Windows? Even the OS

Re: [time-nuts] Win XP and NIST time

Dan (I think) writes: > Because, up until today, windows time did what I needed it to do. It may > still, if the fault turns out to be network related. > > In reality, it's more software to learn to administer, and setup and run > on bunch of PC's. As a time nut, I know exactly how much time I nee

Re: [time-nuts] Win XP and NIST time

Jay Cox writes: > I am a new member, in St Pete, Florida. I noticed that last week, my XP > laptop had not updated at the arrival of summer time and I had to do it > manually. The DST changeover times are contained in the registry. Each time they change, Microsoft issues an update that corrects t

Re: [time-nuts] Is there anything wrong with DCF77?

>On 1/1/2013 9:42 PM, Tom Harris wrote: > If you can look at the output of a DCF77 demodulator you should see a nice > clean set of 100ms/200ms pulses every second. All you need is a CRO, or you > could just use a LED to indicate the state. >This is how DCF77 looks, when received with an

Re: [time-nuts] Is there anything wrong with DCF77?

> Could be that neighbor with the 1,000,000 light Christmas display …. Hmm ... that sounds like a likely culprit. There are some Christmas lights nearby. We'll see if the problem disappears with the lights. Good ideas, thanks Bob and Poul. -- Anthony

Re: [time-nuts] Is there anything wrong with DCF77?

> For DCF77 a very typical source of trouble is old CRT-based televisions > or monitors, since 15625 Hz * 5 = 78125 Hz I suppose someone nearby could have received a collector's-item Trinitron for Christmas. What about Wi-Fi, cell phones, and such? They are way far away in frequency, but I'm not

Re: [time-nuts] Is there anything wrong with DCF77?

> Hi Anthony, is there any possibility that you have a source of local > interference that started up in your home or area? Maybe, but I'm not sure where it would come from. It's been like this for days, and today there is no reception by any of the clocks at all. If just one clock failed to recei

[time-nuts] Is there anything wrong with DCF77?

For the past several days (now thirty hours straight), none of my radio-synchronized clocks has been able to synchronize with DCF77. Is there a problem with the transmitter, or maybe a geomagnetic storm or something that could explain it? I've been looked at the transmitter Web site and searching f

Re: [time-nuts] Google's Spanner uses GPS and atomic time

John writes: > Seems like a good reason to have LORAN-C or some other backup/sanity check. What LORAN? I thought the U.S. had shut down all LORAN transmissions in order to enhance the vulnerability of navigation systems in the U.S. (?). -- Anthony __

[time-nuts] Google's Spanner uses GPS and atomic time

In case anyone here hasn't seen this article: http://www.wired.com/wiredenterprise/2012/09/google-spanner/all/ Google is using GPS and atomic time synchronization across its data centers to ensure database consistency in innovative ways. Apparently there's a paper out on the system now but I have

Re: [time-nuts] The Patent Brouhaha

> Murky waters!! > m_medium=email&utm_campaign=GNSS-Design_06_29_2012&utm_content=patent-brouha ha-13157>> They are only murky because patent offices place fewer one fewer restrictions on what can be patented. In the o

Re: [time-nuts] NTP for 64 bit windows

> The built-in client does not support NTP fully - for example, reference > clocks and the management functions. Tell me how accurate it is, for > example. It is accurate enough that I can't see or hear a difference between the Windows machine and the BSD server to which it is synchronzed. All I'

Re: [time-nuts] NTP for 64 bit windows

> 1) Does windows really implement NTP? I thought it was SNTP. Apparently, in current versions of Windows, it is a home-cooked version of an NTP client. All I know is that my PC stays accurate within a very small fraction of a second while synchronizing from my NTP server (the UNIX machine sitting

Re: [time-nuts] NTP for 64 bit windows

> Has anyone come across a NTP client that uses native 64 Win 7 code? I've > noticed all the 64 bit versions are running under WOW. I've use Meinberg > now found another source out of Poland. Windows has long had its own built-in NTP client. All you have to do is use that. You can change the param

Re: [time-nuts] What is NIST "official time" ?

For what it's worth, I just checked my NTP-synchronized time on my computers with NIST time in Boulder (via telephone), and they are right on the money, allowing for the slight propagation delay. Certainly nowhere near 20 seconds apart, more like 100 ms apart. -- Anthony

Re: [time-nuts] Clearest article yet on LightSquared's threat to GPS

> http://www.gpsworld.com/machine-control-ag/news/john-deere-massive-lightsquared-interference-with-no-solution-sight-11712 > > Many unanswered questions about how LightSquared got the FCC to > do an end run around established rulemaking procedures on such an > important issue. Woodward and Bernst

Re: [time-nuts] Result of Earth Quake speeds up earth?

> Just a bit of an odd question... > I hear in the Media that the earth quake sped the rotation of the earth > up.. > Can anyone confirm this? Any time any mass shifts inwards or outwards from the Earth's center, there will be a change in the rotational speed of the planet. Angular momentum must b

Re: [time-nuts] Mains as time-reference

>> There's a beautiful screensaver available at >> http://gridwise.pnl.gov/technologies/ >> which shows the US WECC ( or so it seems ). I tried running the monitor program (not the screen saver), and it says that I have no Internet connection available. A sniff of the network indicates that it is

[time-nuts] Test message

Just a test message to make sure I have my filters set right. Sorry. -- Anthony ___ 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.