[time-nuts] Leap second - MSF time signal

David Malone dwmalone at maths.tcd.ie
Sun Jan 1 07:02:13 EST 2017


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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