User's Manual

What is Radio Controlled Clock
With the Radio-Controlled 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 deviate 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 reach a
distance of 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 effect ( see below ) may affect the transmitting distance.
For more information, please study the WWVB WEB page of NIST at :
http://www.boulder.nist.gov/timefreq/
Environmental Reception Effects
The Radio-Controlled Clock obtains the accurate time with wireless technology. Same as
all wireless devices, the receiving ability may be affected by, but not limited to, the following
conditions:
• Long transmitting distance.
• Nearby mountains and valleys.
• Among tall buildings.
• Near railway, high voltage cable, etc.
• Near freeway, airport, etc.
• Near construction site.
• Inside concrete buildings.
• Near electrical appliances.
• Bad weather.
• Inside moving vehicles.
• Nearby metallic structures.
P. 2