TOm,
There is no provision in the NIST WWV/H/B timecode for a leap deletion
nor is ther provision in the hardware timecode generators for that. The
DUT1 is a signed adjustment to the current UTC to produce UTC1. The
adjustment changes sign after a leap second to reflect the current
offset of UTC1 from UTC. The DUT1 sign has nothing to do with the
insertion/deletion of the leap.
Dave
Tom Van Baak wrote:
The DUT1 does take on negative and positive values as the TAI offset
wanders; however, the broadcast timecodes of WWV/H and WWVB have only
four bits, one of them the sign. There is no provision for a delete
second. So, if the UT1 moves north instead of south, more than 0.7 s
would be lost.
Dave, I think we've been through this before. The NIST
radio timecode can handle either insertion or deletion
of leap seconds. The LS bit tells you if a leap second
is pending; the sign of DUT1 bit(s) tell you if the leap
is positive (inserted) or negative (deleted). So there is
provision; there is no problem.
/tvb
http://www.leapsecond.com/notes/leap-watch.htm
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