Jumbo Atomic Clock
Model 86931
With Indoor Temperature
Instruction Manual
THE SKYSCAN ATOMIC CLOCK
With the SkyScan 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/
