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ABOUT WWVB
The NIST (National Institute of Standards and
Technology—Time and Frequency Division) radio station,
WWVB, is located in Ft. Collins, Colorado and transmits the exact
time signal continuously throughout the United States at 60 kHz.
The signal can be received up to 2 000 miles away through the
internal antenna in the weather station. However, due to the nature
of the Earth’s Ionosphere, reception is very limited during daylight
hours. The weather station will search for a signal every night
when reception is best. The WWVB radio station derives its signal
from the NIST Atomic clock in Boulder, Colorado. A team of
atomic physicists continually measure every second of every day
to an accuracy of ten billionths of a second a day. These physicists
have created an international standard, measuring a second as
9,192,631,770 vibrations of a Cesium 133 atom in a vacuum. This
weather station regulates the WWVB sensor.