The La Crosse WT 3143A 14-Inch Atomic Wall Clock is a traditional analog clock thats styled and sized primarily for business and institutional applications. With its large face and numerals, it is well suited to larger rooms and workspaces where a smaller clock would be hard to read from a distance.
- Accurate to 1 second per million years.
- Sets automatically to WWVB radio signal.
- Pushbutton selection of all four U.S. mainland time zones
- Automatically adjusts for Daylight Savings Time.
- Manual time-set capability for use anywhere outside the WWVB signal range.
- Powered by one AA (1.5V) alkaline battery, with normal life of over 1 year (battery must be obtained separately).
With a 14-inch (356 mm) overall diameter, the
WT-3143A is an excellent and economical choice for both businesses and
educational institutions. And who knows? You may actually find a use for this
clock in your garage, shop, or even your house--anywhere you might need a
fairly large, reasonably priced, conservatively styled, and totally accurate
to 1 second per million years.
• Sets automatically to WWVB radio
• Pushbutton selection of all four U.S. mainland time zones.
Automatically adjusts for Daylight Savings Time.
• Manual time-set
capability for use anywhere outside the WWVB signal range.
face, narrow black surround, and big, bold numerals for a simple, classic look
Low battery indication via 2-second steps of second hand.
by one AA (1.5V) alkaline battery, with normal life of over 1 year (battery
Diameter: 14 inches (356 mm) overall
• Depth: 1.625 inches (41.3 mm)
NIST (National Institute of Standards and Technology, Time and Frequency
Division) maintains a radio station, WWVB, in Ft. Collins, Colorado. The WWVB
radio station derives its signal from the NIST atomic clock in Boulder,
Colorado. A team of atomic physicists is continually measuring 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.
WWVB (the station’s identification just like any other radio station)
continuously broadcasts time and frequency signals at 60 kHz. The carrier
frequency provides a stable frequency reference traceable to the national
standard. There are no voice announcements on the station, but a time code is
synchronized with the 60 kHz carrier and is broadcast continuously at a rate of
1 bit per second using pulse width modulation. The time code contains the year,
day of year, hour, minute, second, and flags that indicate the status of
Daylight Saving Time, leap years, and leap
The La Crosse Technology WT-3143A Analog
The La Crosse Technology Radio-Controlled
Clock maintains its incredible accuracy by automatically tuning into the WWVB
radio signal. The built-in antenna ensures reliable signal reception up to 2000
miles (3200km) from the WWVB transmitter. As a result, the La Crosse Technology
clock will calibrate to the atomic clock not only throughout the mainland U.S.
but also in much of Canada. You need only insert the battery, press the
appropriate time zone button, and wait until the signal is received
(overnight). In all other locations worldwide, the La Crosse clock can be
manually set and will provide the high degree of accuracy of any quality quartz
In a nutshell, heres how the La Crosse clock works:
The clocks antenna is specifically tuned for optimal reception of the 60 kHz
time signal. The time signal received on the antenna is demodulated by an
onboard receiver, which sends the information to the clocks CMOS microprocessor
for decoding. Once your clock has automatically set its time for the first
time, it ensures continuing accuracy by automatically tuning into the WWVB
radio signal once per day after midnight. As long as your clock is kept within
transmitter range, it will continue to display the absolutely precise time,
even automatically adjusting for summer time/winter time changeovers. Should
you move your clock out of transmitter range for an extended period of time,
the clock will continue to operate as a highly accurate quartz-controlled
clock. Upon re-entering the transmitter range, your clock will correct itself
again to the precise WWVB time signal.