[time-nuts] Smart Phone time display accuracy...?

[John Allen]

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:time-nuts-bounces at febo.com] 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 <r3m1g4 at verizon.net> 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:time-nuts-bounces at febo.com] On Behalf Of Mike Baker
> Sent: Wednesday, March 15, 2017 22:33
> To: time-nuts at febo.com
> 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
> *****************
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