During normal operation, the 60 kHz signal from WWVB is transmitted 24 hours per day, 7 days a week. The table includes periods since October 1, 2010 when the signal broadcasted a Phase Error for more than 5 minutes.
The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce.
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Date created: November 5, 2010 | Last updated: September 16, 2015