[MAMS] Computer clock

[Dr. Gerald N. Johnson]

Another test is my Garmin GPS. On the set up screen it shows time to the 
nearest second and the second pulses from a GPS are used to reference 
frequencies to better than WWVB these days, parts in 10^-12 or better. I 
have this computer running XP update the clock every few weeks, but I've 
not compared to GPS lately. So grabbed the GPS and checked. The computer 
was ten seconds fast. I asked it to update and it came back 16 seconds 
fast. I asked it to update again and it came within 2 seconds. I'm sure 
the delays in the internet are always present and not quite the same 
thing ten seconds apart. I believe the GPS the best and it can be 
connected to the computer, though I don't have software on hand for 
setting the computer clock from it. Don't need that fine a precision in 
this laptop.

73, Jerry, K0CQ

On 8/29/2015 4:16 PM, Dave Sublette wrote:
> Sorry if this seems off topic, but it does relate to the timing of sequences ….
>
> I use a Mac Mini Computer.  The system clock is synchronized automatically using
>
> time.apple.com<http://time.apple.com/>.
>
> If I look at the time on my cell phone and compare the two, the computer is almost one minute faster than the cell phone.  I thought cell phones were accurate.  Which is correct?  Or…. how do I fix which ever one is wrong?
>
> Thanks,
>
> Dave, K4TO
> ______________________________________________________________
> MAMS mailing list
> Home: http://mailman.qth.net/mailman/listinfo/mams
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:MAMS at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html