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La
Crosse WT-3143A 14" Analog Atomic Wall Clock
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The La Crosse WT 3143A is a traditional analog clock that's 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.
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| The La Crosse WT-3143A has
an ivory-colored dial, a narrow black plastic case, and black
hands and numerals. The numerals are large and in a serif font,
which helps to give the clock its classic, businesslike look. |
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With a 14" (356 mm)
overall diameter, the La Crosse 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 wall clock. |
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Features:
- 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.
- Ivory face, narrow
black surround, and big, bold numerals for a simple, classic look
- Low battery
indication via 2-second steps of second hand.
- Powered by one AA
(1.5V) alkaline battery, with normal life of over 1 year (battery
must be obtained separately).
Dimensions:
- Diameter:
14 inches (356 mm) overall
- Depth:
1.625 inches (41.3 mm)
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Radio-Controlled Time:
The 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 seconds.
The La Crosse WT-3143A Analog
Atomic Clock:
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 clock.
In a nutshell, here's how the the La
Crosse clock works: The clock's 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 clock's 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.
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| Note: This
unit has atomic clock functionality. The atomic clock can receive
time broadcasts from the U.S. Atomic clock transmitter in Colorado, and
synchronize itself to the U.S. Atomic clock every night. As long
as the signal is strong where the atomic clock is located, the atomic
clock will maintain accuracy to a fraction of a second, and reset itself
for daylight savings time (unless you choose to disable the DST
function). However, if the atomic clock is located where the
signal is poor, due to metal in the construction of your building
blocking the signal, or due to electrical interference from nearby
electrical appliances or computers, then the atomic clock may not always
receive adequate signal. Under these conditions, the atomic clock
may still synchronize occasionally, when weather conditions are ideal,
or may need to be set manually. |
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If the order
button is there, but the shopping cart page indicates that there
are no units available, then we are temporarily out of stock.
The item should be available in a day or two. Our
inventory control system tries it's best to keep us from
allowing the sale of something we don't have on the shelf.
If there is no
order button, most likely there are bigger problems with
availability. We may be out of stock for more than a few
days.
For shipping time estimates, please see the Fedex web site at www.fedex.com.
Your package will be shipped from zip code 60544. Keep in mind, Fedex travel days do not include
weekends or holidays.
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