WT-3122A Walnut Finish 12.5" Atomic Wall Clock, By La Crosse Technology

The WT-3122A Atomic Clock, By La Crosse Technology, calibrates itself to the world's most accurate clock every night by receiving WWVB radio transmissions. These transmissions contain time information from the U.S. Atomic clock source, operated by the U.S. Commerce Department near Boulder, Colorado. The built-in antenna ensures reliable signal reception up to 2000 miles (3200km) from the WWVB transmitter.

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The WT-3122A has a white dial and a wide, solid wood surround with a beautiful walnut finish. Overall diameter is 12.5 inches (31.8cm). Classically elegant, this clock is perfect both for the executive or professional office and for the home.

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
White face with walnut-finished wood surround for a look of classic elegance
Low battery indication via 2-second steps of second hand
Powered by one AA alkaline battery (not included), with normal life of over 1 year

Dimensions:

Diameter:
12.5 inches (31.8cm) overall
Depth:
1.5 inches (3.8cm)

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 Technology WT-3122A 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.

This unit does not come with batteries. It requires 1 AA battery, which may be purchased below.

Note: This product has "atomic" clock functionality. Atomic, or Radio Controlled clocks receive a radio signal to set themselves. Like any radio receiver however, they may not be able to receive the signal if they are in a building with a lot of steel in the structure, near computers or other electrical equipment that may generate interference, or if the weather is unsuitable. The signal they receive does not propagate well during the day. That's the nature of the signal, not the clock. These clocks are designed to catch the signal when they can, generally in the middle of the night, calibrate themselves, and then run quite accurately for days until they can catch another signal. When you first put in the batteries, they will most likely not set themselves until the middle of the night. That's normal. By morning, weather permitting, it should be correct. Under less than ideal conditions, it could take a few days. Daylight savings time changes may not be made the first night if location and weather are not favorable.

WT-3122A Walnut Finish 12.5" Atomic Wall Clock, By La Crosse Technology

WT-3122A Walnut Finish 12.5" Atomic Clock, By La Crosse Technology

Features:

Dimensions:

Radio-controlled Time:

The La Crosse Technology WT-3122A Atomic Clock:

WT-3122A Walnut Finish 12.5"
Atomic Clock, By La Crosse Technology