WWV rumble

[Nigel Holmes 03 9626 1914 fax 03 9626 1917]

        Jeff,

        The rumble on WWV is a 100 Hz sub-carrier used to carry digital
        data that forms a time code. I think its an IRIG code but not
        IRIG-B. It gives the year, day, minutes & seconds plus the
        difference between UT1 (GMT) and UTC. The US National Institute
        of Standards has two publications that describe this & other
        facets of the Time Signal broadcasts. One used to be called
        Technical Note 668. Hope this helps.

        Nigel Holmes VK3ZNQ

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