[time-nuts] TBolt: UTC PPS

[Don Latham]

or, "the map is not the territory"?
Don

Tom Van Baak
> Hal,
>
> The words "insert a pulse" is what causes the confusion in
> conjunction with leap seconds. There is no extra or missing
> pulse; no double pulse, no early or delayed pulse.
>
> The 1PPS output continues to give a pulse at a 1 Hz rate
> regardless if there is leap second or not. There is never
> any ambiguity with TAI or UTC with respect to the pulses
> themselves.
>
> The confusion with terminology arises from the fact that the
> implicit or explicit time-of-day string associated with a UTC
> time scale does its funny thing around a leap second. If
> there is a negative leap second the "23:59:59" label is
> missing. If there is a positive leap second the "23"59"60"
> is present. You'll also see some GPS receivers or timing
> systems use the unofficial trick of labeling "23:59:59" or
> "00:00:00" twice rather than using "23:59:60". No matter
> how it's done, it's just the label. The pulses still come once
> a second. Does that help clarify the situation?
>
> /tvb
>
>
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-- 
Dr. Don Latham AJ7LL
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