[time-nuts] Leap second - MSF time signal

Peter Vince petervince1952 at gmail.com
Sun Jan 1 11:06:09 EST 2017

Hi Deirdre,

     Well done getting such a clear recording!  Yes, the leap-second is
effectively inserted after the DUT1 code on MSF as you say, even though
that isn't crystal clear from the MSF spec document that David linked to.
The DUT1 codes refer to the "current" minute, whilst all the rest of the
time and date information refers to the next minute epoch!


On 1 January 2017 at 15:01, Deirdre O'Byrne <deirdre.dub at gmail.com> wrote:

> 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! :)

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