nature of the Earth's Ionosphere, reception is very limited during daylight hours.
The Watch will search for a signal every night when reception is best. The WWVB radio station derives its signal from the NIST Atomic clock in Ft. Collins, Colorado. A team of atomic physicists is continually measuring every second, of every day, to an accuracy of ten billionths of a second per day. These physicists have created an international standard, measuring a second as 9,192,631,770 vibrations of a
For more information on WWVB and the NIST Atomic clock please visit their website at http://www.boulder.nist.gov/timefreq/stations/wwvb.htm
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