NoticeNIST Radio Station WWVB will be conducting a test of a phase-modulated broadcast format beginning at 1800 UTC (12:00 noon MDT) Tuesday, May 29 to 1800 UTC on Wednesday, May 30 2012. The normal broadcast format will then be restored for a two-hour period. The test will then resume at 2000 UTC (2:00 PM MDT) and end at 1800 UTC, Thursday, May 31 2012. Radio-controlled clocks and watches will not be affected. Phase-locking 60 kHz timing and frequency standard receivers may lose lock during the test. For more information, call WWVB broadcast manager John Lowe at 303-497-5453, or email john.lowe@nist.gov.
During normal operation, the 60 kHz signal from WWVB is transmitted 24 hours per day, 7 days a week. The table includes periods when the signal was off or intermittent for more than 5 minutes.
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