[time-nuts] Leap second glitches on NTP using Z3801A

Eric Garner garnere at gmail.com
Mon Nov 17 04:02:26 UTC 2008


Ascending from Lurk Mode, I have a (possibly stupid) question: according to

http://tycho.usno.navy.mil/leapsec.html

and Tony Jones's book "The Story of Atomic Time" GPS time does not
account for leap seconds, So why does it alert you to them?

-eric

On Sun, Nov 16, 2008 at 7:21 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> Is anybody running ntpd with their Z3801A?
>
> If so, please check your log files and tell me if you see a bogus leap second
> at the end of the past several months.  I've seen them for Aug, Sep, and Oct.
>  I think they are coming from my Z3801A, but it might be something else.
>
> The GPS satellites are now announcing a leap second that will happen at the
> end of the year.   The refclock driver passes that to ntpd and ntpd passes it
> to the kernel and magic happens.
>
> I think the refclock-ntpd interface assumes the leap second will happen at
> the end of the current month.  NIST only announces leap seconds a month ahead
> on WWVB and ACTS.
>
> The Oncore refclock driver has a filter to wait until the current month to
> pass the info to ntpd.  I'm working on something similar for the HP driver.
>
> --
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>



-- 
--Eric
_________________________________________
Eric Garner



More information about the time-nuts mailing list