Solid Signal > Home and Garden > Atomic Clocks > La Crosse Technology WS-8117U-IT-AL
This elegant atomic clock has a deep cherry finish and displays the most precise and accurate time possible. A radio signal is received daily from Colorado that updates the atomic clock to within one second of official U.S. government time. The atomic clock even automatically resets for Daylight Savings Time! The atomic clock displays indoor and outdoor temperatures, moon phase, and includes day/date in your choice of four languages.
- Available in Cherry, Oak, Or Ivory
- Sets automatically to WWVB radio signal (manual setting is also possible)
- User-selectable 12- or 24-hour time display. Hour and minutes are separated by a flashing colon (:) that indicates seconds
- Daily alarm setting with snooze function
- Calendar display with weekday abbreviations in your choice of four languages: English, French, Spanish, or German
- Time zone setting (13 available)
- Daylight saving time ON/OFF option
- Moon phase (12 phase icons)
automatically to WWVB radio signal (manual setting is also possible).
User-selectable 12- or 24-hour time display. Hour and minutes are separated by
a flashing colon (:)
that indicates seconds.
• Daily alarm
setting with snooze function.
• Calendar display with weekday
abbreviations in your choice of four languages: English, French,
• Time zone setting (13 available).
saving time ON/OFF option.
• Moon phase (12 phase icons).
• Outdoor temperature display via wireless remote
• Temperature displays are user-selectable for either °F
• Clock can be wall mounted, or integral foldout stand can be
extended for placement on a table or shelf.
• Clock is powered by two
AA alkaline batteries (not included), with normal life of about 1 year.
Outdoor temperature transmitter is powered by two AA alkaline batteries (not
included), with normal
life of up to 2 years.
Outdoor Temperature Transmitter
• Remote transmission of
outdoor temperature to clock via 915 MHz signals.
Indoor temperature measuring range:14.1° to 100°F
temperature measuring range: -39.8° to 139.8°F
distance:330 feet (100 meters) maximum
• Clock dimensions: 12.20
inches wide, 8.03 inches high, 1.18 inches deep
(excluding foldout stand for freestanding
• Remote transmitter dimensions: 1.5 inches wide, 5.05
inches high,0.83 inch deep
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
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 WS-8117U-IT-C Digital
The La Crosse Technology Digital Atomic 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 batteries, wait until the signal is
received, and program the desired additional settings. In locations outside of
WWVB range, the La Crosse clock can be manually set and will provide the high
degree of accuracy of any quality quartz clock.
nutshell, here’s 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 at
midnight. (If no signal is detected, the clock performs its WWVB check hourly
until the signal is found.) As long as your clock is kept within transmitter
range, it will continue to display the absolutely precise time, automatically
adjusting for summer time/winter time changeovers if the daylight savings time
option is ON. 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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