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This clock features multiple
display modes for the second line of its LCD display (below the main
hour-and-minutes display). Initial
(default) display mode for clock setup is day.date.year and outdoor
temperature. The 6 regular display modes are:
- Month.date.year and
outdoor temperature.
- Clock seconds and
outdoor temperature.
- Alarm 1 time and
outdoor temperature.
- Alarm 2 time and
outdoor temperature.
- Indoor temperature
and outdoor temperature.
- Day.month.date and
outdoor temperature.
The WT-5442U's atomic clock also has dual
alarm settings with adjustable snooze from 1 to 59 minutes.
In addition
to displaying indoor and outdoor temperatures, the WT-5442U provides
accurate weather forecasts by means of its three indicator icons and a
barometric pressure trend arrow. The weather-forecasting feature senses
barometric pressure over time and adjusts the indicator icons to provide
accurate forecasts based on pressure trends. The sun icon predicts
improving weather, the sun-and-clouds icon predicts fair weather, and
the clouds-and-rain icon predicts worsening weather. The predictions are
about 75% accurate for 12 to 24 hours.
Designed for table or shelf
placement, the clock can be powered from the included ac adapter (for
continuous projection) or optionally from three AA batteries. The TX6U
remote transmitter is powered from two AA batteries.
Features:
- Sets automatically
to WWVB radio signal (manual setting is also possible).
- 12-hour or 24-hour
time display.
- Calendar display.
- Six regular LCD
display modes, all of which include outdoor temperature. Additional
displayed information can be month.date.year, clock seconds, alarm 1
or 2 time, indoor temperature, or day.month.date.
- Three projection
modes: time only, outdoor temperature only, or alternating between
the two.
- Projection is
continuous with ac powering.
- Projection is
initiated via pushbutton and 3 seconds in duration with battery
powering (pushbutton projection is also available with ac
powering).
- Projection
auto-focusing for display from 3 to 10 feet away on ceiling or wall.
- Projected display
can be rotated 360° in 90° increments for proper viewing.
- Projector case
rotates 180° to further orient the projected display.
- Three different
intensity settings for projected display, plus an "off"
setting. With battery powering, "off" is the only option;
the intensity is not adjustable and the projection is via pushbutton
(not continuous).
- Dual alarm settings
with adjustable 1- to 59-minute snooze function.
- Time zone setting
(13 available) with map display for U.S. time zones.
- Daylight saving
time ON/OFF option.
- Indoor temperature
display in either °F or °C.
- Outdoor temperature
display (via 433 MHz transmission) in either °F or °C.
- Three
weather-forecast icons plus a barometric pressure tendency arrow.
- Electro-luminescent
backlight for LCD display (2-second duration initiated by
pushbutton).
- Integral base for
table/shelf/desktop placement.
- Clock powered by ac
adapter (included) or by three AA 1.5V alkaline batteries (not
included), with normal life of about 1 year.
- Remote TX6U
wall-mount temperature transmitter powered by two AA 1.5V alkaline
batteries (not included), with normal life of about 1 year.
Specifications:
- Indoor
temperature measuring range:
32° to 122°F with 0.2°F resolution
(0° to 60°C with 0.1°C resolution)
- Outdoor
temperature measuring range:
-21.8° to 157.8°F with 0.2°F resolution
(-29.9° to 69.9°C with 0.1°C resolution)
- Temperature
checking intervals:
Indoor: every 10 seconds
Outdoor: 3 time in 10 minutes
- Transmission
distance:
maximum 82 feet (25 meters)
- Clock
dimensions:
5.5 inches (140 mm) wide
4 inches (102 mm) high
1.5 inches (38 mm) deep (including base)
- LCD display
dimensions:
2.5 inches (64 mm) wide
2 inches (51 mm) high
Time number height: 0.75 inch (1.9cm)
- TX6U remote
sensor/transmitter dimensions:
1.57 inches (40 mm) wide
5.04 inches (128 mm) high
0.9 inch (23 mm) deep
- Power source:
AC adapter (included):
120Vac, 60Hz input
6Vdc, 100mA output
Optional: three 1.5V AA alkaline batteries (not included)
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 WT5442 Digital
Atomic Projection Alarm Clock with Temperatures and Forecast Display:
The La Crosse Technology Digital Atomic
Projection Alarm Clock with Temperature and Forecast Display 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
LaCrosse 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 at midnight. 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. |
