Home > Personal Audio/Video > Atomic Clocks > La Crosse Technology WS-8157U-CH-IT
This sleek atomic digital wall clock has an elegant cherry finish, indoor and outdoor temperature display, weather forecasting icons and alarm with snooze function. The atomic clock can be mounted on a wall or used on table and desk tops. Atomic time never needs resetting - a daily radio signal from Colorado resets the atomic clock to within one second of official U.S. government time.
- 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
- Weather forecast (3 forecast icons plus 2 weather tendency arrows) for next 12 to 20 hours based on changes in air pressure.
The three weather forecast icons that
can be displayed by the WS8157UCH are:
• Sunny: Weather is
expected to improve (not that it will be sunny).
• Sun with Clouds:
Weather is expected to be fair (not that it will be partly cloudy).
with Rain: Weather is expected to worsen (not that it will actually rain).
If the barometric pressure is currently changing, an up or down weather
tendency arrow is displayed along
with the forecast icon. The up
arrow indicates increasing pressure and that the weather is expected
improve or remain good. The down arrow indicates decreasing pressure and that
the weather is expected
to worsen or remain poor. No arrow indicates
stable air pressure.
• In addition to weather forecast information,
the WS-8157UCH displays the time, day/date, weekday, indoor
temperature, and outdoor temperature. The
outdoor temperature is transmitted to the clock by an
included TX6U wireless remote thermo
sensor/transmitter. This clock also features a daily alarm setting with
• The WS8157UCH is medium-large in size (about 12 x 8
inches) and has large digital displays for great
readability, even from a distance. Hours and
minutes are displayed in extra- bold digits a full 2
tall. Temperatures are displayed in bold digits almost 3/4 inch tall; day and
date, in digits about
1/2 inch tall.
information in the initial display mode (pictured) includes time (hour and
minutes), month and
date, weekday, indoor temperature, outdoor
temperature, and forecast icon (with up or down
weather tendency arrow if air pressure is
changing). Three other display modes let you display clock seconds
digitally in place of the weekday, the indoor
temperature, or the outdoor temperature.
• Mount this clock on a
wall, or extend the clocks integral foldout stand to use it as a freestanding
unit on a
table or shelf.
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.
alarm setting with snooze function.
• Calendar display with weekday
abbreviations in your choice of four languages: English, French, Spanish,
• Time zone setting (13 available).
saving time ON/OFF option.
• Weather forecast (3 forecast icons plus
2 weather tendency arrows) for next 12 to 20 hours based on changes
• Indoor temperature display.
temperature display via wireless remote transmitter.
displays are user-selectable for either °F or °C.
• Clock can be wall
mounted, or integral foldout stand can be extended for placement on a table or
• Clock is powered by two AA alkaline batteries (not
included), with normal life of
about 1 year.
temperature transmitter is powered by two AA alkaline batteries (not included),
with normal life of
about 1 year.
• TX6U Outdoor
• Remote transmission of outdoor temperature
to clock via 433 MHz signals.
• Wall mounting (remote unit snaps into
its own wall-mounted bracket).
• Indoor temperature measuring range: 32° to 122°F with 0.1°F
resolution (0° to 50°C with 0.1°C resolution)
temperature measuring range: -21.8° to 157.8°F with 0.2°F resolution (-29.9° to
checking intervals :Indoor: every 10 seconds Outdoor: every 5 minutes
Transmission distance: 2 feet (25 meters) maximum in open area with no
• Clock dimensions: 12.20 inches (310 mm) wide, 8.03
inches (204 mm) high, 1.18 inches (30 mm) deep
(excluding foldout stand for freestanding
• Remote transmitter dimensions: 1.57 inches (40 mm)
wide, 5.04 inches (128 mm) high, 0.9 inch,
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 WS8157UCH 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
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