User's Manual

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Fort Collins
2000 miles
1200 miles
The ATOMIC Clock
With the Atomic Clock, you have the most accurate timepiece within the
continent. It can receive the time signal transmitted by the National
Institute of Standards and Technology (NIST), which is regulated by 3
atomic clocks and deviates less than 1 second within 3,000 years. The NIST
broadcasts the time signal (WWVB, 60kHz) continuously from Fort Collins,
Colorado. This signal can be received anywhere in the continental USA that long
wave (AM) radio reception is possible with a portable radio. It is expected
that the signal can cover a distance of over 2,000 miles from the transmitter.
Therefore, your clock will receive the signal within the broadcast range
anywhere an AM signal can be received; generally the signal cannot be
picked up in massive metal and concrete structures unless near a window.
In addition, some environmental effects (see next page) may affect the
transmitting distance.
For more information, please study the WWVB WEB page of NIST at:
http://www.boulder.nist.gov/timefreq/
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