WT-966B Atomic Watch by La Crosse Technology

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Home › Atomic Watches › La Crosse Technology Atomic Watch

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Like all La Crosse Technology Atomic Watches, the WT-966B 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 small internal antenna is ultra sensitive to ensure reliable signal reception.

Features:

* Absolute time and date accuracy
* WWVB radio controlled time and date
* Selection of 24 time zones
* US time zones display with three characters (ATL, EST, CST, MST, PST, ALA, HAW)
* Day, month, date display
* Signal reception indicator
* Manual transmission seeking function
* Plastic case
* Water resistant
* Metal/plastic band
* Stainless steel butterfly clasp
* Battery-saving "OFF" function
* Low battery indicator
* Powered by 3V lithium battery (included), expected lifetime of three years

The WT966B comes in Stainless Steel finish.

Dimensions:

* Case:
1-11/16" x 1-9/16" x 1/2"
43 x 40 x13 mm
* LCD:
1/2" x 13/16"
3 x 21 mm
* Time display:
3/16"
5 mm high

* Band length (less clasp):
6-1/4" x 13/16"
159 x 21 mm
* Fits wrists up to 8-3/4" (222 mm)
* Removable links to adjust size down in 3/8" (10 mm) increments (20 total links

The La Crosse Technology WT-966B Radio Controlled Atomic Watch:

Our La Crosse Technology radio-controlled atomic watch maintains its incredible accuracy by automatically tuning into the WWVB radio signal.

The atomic watch contains a small but highly powerful antenna, specifically tuned for optimal reception of the 60 kHz time signal. The signal received on the antenna is demodulated by a tiny onboard receiver, which sends the information to the atomic watch's ultra-low-power CMOS microprocessor for decoding. Once your atomic watch 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 atomic wristwatch is kept within transmitter range, your atomic watch will continue to display the absolutely precise time, even performing automatically the adjustment for summer time/winter time changeovers. Should you move your atomic watch out of transmitter range for an extended period of time, your atomic watch will still continue to operate as a highly accurate quartz controlled watch. Upon re-entering the transmitter range, your atomic watch will correct itself again to the precise WWVB time signal.
Radio-controlled Time:

The NIST (National Institute of Standards and Technology-Time and Frequency Divisions) 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.