recognize DST (Arizona) you must press the DST button (unmarked – just above
and between the Central and Eastern time zone buttons) for one second to
deactivate your clock’s DST program.
For time zones outside of PT, MT, CT or ET you must manually set the time using
the Manual Time set button on the back of the movement. (See instructions
below).
Please Note: WWVB time will over ride a manual setting.
ADDITIONAL DETAILS
For a better understanding of how and why your clock works please continue reading.
NOTHING IS MORE PRECISELY MEASURED THAN TIME!
And nothing keeps track of time more precisely and trouble free than La Crosse
Technology® atomic clocks.
Since the beginning of time, man has been fascinated with the measurement of time
and has devised more accurate machines to measure time. Today, time is precisely
measured in the United States by the most accurate clock in North America, the Atomic
Clock of the US National Institute of Standards and Technology, Time and Frequency
Division in Boulder, Colorado. A team of atomic physicists continually measures 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 Cesium 133 atom in a vacuum. This atomic clock
regulates the WWVB radio transmitter located in Fort Collins, Colorado. From here the
exact time signal is continuously broadcasted throughout the United States at 60 kHz to
take advantage of stable long wave radio paths found in that frequency range. Radio
waves at these low frequencies use the earth and the ionosphere as a wave-guide and
follow the curvature of the earth for long distances.
The built in antenna system in your clock will receive the WWVB signal anywhere in
North America within 2000 miles of Fort Collins where long-wave radio reception is
undisturbed. A microprocessor activates the receiver and processes the time signal from
Fort Collins overnight.
Through the radio signals, La Crosse Technology® atomic clocks always keep precise
time. The changeover from standard time to daylight saving time, and vice versa, takes
place automatically with the same precision.
The La Crosse Technology® atomic clock is designed for indoor use.
For indoor locations, select a location to place your radio controlled clock where it
will be at least six feet away from a TV, computer, air conditioner or other
household electrical appliances.
The optimal location is near a window. Windows facing Colorado provide the best
signal.
Do not submerge clock in water.
Extreme temperatures, vibration, and shock should be avoided to prevent damage
to the clock.
The WWVB time signal will easily penetrate masonry and wood framed buildings.
The WWVB signal will penetrate almost every residential building and most steel
buildings if they have adequate windows. It is not possible, however, for the
WWVB signal to penetrate most indoor shopping malls and rooms in the center of
large office buildings that do not have windows.
In buildings that WWVB cannot penetrate you may set the time using the manual
time set button. When the clock receives the WWVB signal it will automatically set
the hands to the exact time.
La Crosse Technology® atomic clocks do not receive or process radio controlled
time signals from Germany’s DCF 77, Japan’s J Ga AS, or England’s MSFs
atomically regulated transmitters. La Crosse Technology® atomic clocks can be
manually set and used anywhere.
Please Note: WWVB time will over ride a manual setting.
For more information on the NIST and radio controlled time, see
www.boulder.nist.gov/timefreq/.