[time-nuts] Leap second - MSF time signal

[Deirdre O'Byrne]

Your decoded timecode only has 60 data points for the 61-seconds of the
last minute of 2016 UTC, so it's impossible to say what your decoder did
with the leap second. (Also I think you have an error in your parity bit
for the time for midnight (bit 57B)).

The long wave spectrum seems to show the same fourteen 0.1+0.9-second
pulses between 23:59:07 and 23:59:20 (inclusive), which tends to suggest
that the leap second was indeed inserted between the DUT1 code and the Year
code.

Interestingly the long wave spectrum also shows DCF77 - a project for when
I get bored! :)


On 1 January 2017 at 12:02, David Malone <dwmalone at maths.tcd.ie> wrote:

> On Sun, Jan 01, 2017 at 02:28:23AM +0000, Deirdre O'Byrne wrote:
> > https://www.youtube.com/watch?v=FpBxB2Yqh-U
>
> Nice.
>
> > Starting at 23:58:00 -
> > A 100000000000000000001011010010110001110100011101100101111110
> > B 100000000111100000000000000000000000000000000000000000001000
> >
> > Starting at 23:59:00 -
> > A 1000000000000000000001011100001000001000000000000000001111110
> > B 1111111000000000000000000000000000000000000000000000000111100
>
> My decoder seemed to give something like this:
>
>         A: 00000000000000000001011010010110001110100011101100101111110
>         B: 00000000111100000000000000000000000000000000000000000001000
>         Raw: 31/12/2016 23:59 Sat -400 No-DST
>         Ctime: Sat Dec 31 23:59:01 2016
>
>         A: 00000000000000000001011100001000001000000000000000101111110
>         B: 11111100000000000000000000000000000000000000000000000111000
>         Raw: 1/1/2017 0:01 Sun 600 No-DST
>         Ctime: Sun Jan  1 00:01:01 2017
>
> Which shows it switching at the right time. There's a long wave spectrum
> at:
>
>         http://www.maths.tcd.ie/~dwmalone/time/leap2016/leap2017010100.png
>
> or an animated verion at:
>
>         https://www.youtube.com/watch?v=9Y_DQZN88HQ
>
> I think the time codes relate transmitted relates to the minute following
> the one in which they are transmitted according to:
>
>         http://www.npl.co.uk/upload/pdf/MSF_Time_Date_Code.pdf
>
> Could that explain what you saw?
>
>         David.
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