There is a NTP app for the iPhone called Gorgy Atomic Timing Clock. You can choose from about 6 different NTP servers and it has an audible tick. It does not (can not) set the iPhone's clock. https://itunes.apple.com/us/app/atomic-clock-gorgy-timing/id295302256?mt=8
It was free, but now is $1.99. John K1AE Bolton, MA -----Original Message----- From: time-nuts [mailto:[email protected]] On Behalf Of Bob Camp Sent: Thursday, March 16, 2017 6:09 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Smart Phone time display accuracy...? Hi Under normal conditions, the Gold Codes on CDMA are synchronized to < 100 ns. It’s only when something goes wrong that they drift out to the 10 us range. Once they get there, the transmitter needs to shut down. Unfortunately, there is no mandatory connection between the transmitter time source for the output coding and the time reported to the phone. Yes, that is really weird. Bob > On Mar 16, 2017, at 1:06 PM, 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. _______________________________________________ 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. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _______________________________________________ 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.
