Attention NIST Radio Station WWVB will be conducting a test of a phase-modulated broadcast format beginning at 1800 UTC (12:00 noon MDT) Tuesday, September 4th and ending at 1800 UTC (12:00 noon MDT) on Thursday, September 6th,2012. During the test period the broadcast will be randomly switching between the normal WWVB broadcast and the new phase-modulated broadcast format. Radio-controlled clocks and watches will not be affected by the test. Phase-locking 60 kHz timing and frequency standard receivers may lose lock during the test, but will restore during the normal broadcast period. For more information, email WWVB broadcast manager John Lowe at [1]john.lowe@nist.gov, or call 303-497-5453. References 1. mailto:john.lowe@nist.gov