>From occasional observations of my IPhone 5 using the emerald sequoia emerald >time application the "within 50 milliseconds" claim seems quite reasonable to >me.
Mark Spencer > On Mar 16, 2017, at 12:31 PM, Chris Albertson <[email protected]> > wrote: > > Apple Support claims "within 50 milliseconds of the definitive global > time standard". At least that is what Apple gives in their spec. > > It might use difference source depending on which radios are enabled. > The phone does have GPS and a cell network radio and both can be used > for time. But on a phone these radios are powered up and down as > needed. I think best just to accept Apple's spec. > > Again it would be fun to measure. There is an API call to get the > system time. One could write a simple app to send this out > > Harder to know the specs on Android as there are so many manufactures > and versions and price points > >> On Thu, Mar 16, 2017 at 10:06 AM, Mike Garvey <[email protected]> wrote: >> CDMA mobile telephony needs system synchronization to +/- 10 uS in order to >> smoothly handoff a moving client from one cell to the next. Most systems use >> GPS to maintain this 10 uS. This says nothing about how bad it could get >> after that. >> Mike >> >> -----Original Message----- >> From: time-nuts [mailto:[email protected]] On Behalf Of Mike Baker >> Sent: Wednesday, March 15, 2017 22:33 >> To: [email protected] >> Subject: [time-nuts] Smart Phone time display accuracy...? >> >> Hello, Time-nutters-- >> >> Any thoughts on what the likely accuracy of smart phone time >> displays might be? I am thinking that the stacking of delays >> along the path to its receive antenna plus any internal processing delays >> would accumulate to some unknown degree. Any thoughts on this? >> >> Mike Baker >> ***************** >> _______________________________________________ >> time-nuts mailing list -- [email protected] To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
