La Crosse Technology 450 - Manual

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LONG RANGE WIRELESS COLOR WEATHER STATION Owner’s Manual
Thank you for purchasing the new generation color weather station. Designed and engineered
with the state-of-art technology and components, this instrument will provide accurate and
reliable measurement of barometric pressure, weather forecast, in/ out humidity, temperature,
heat index, dew point as well as atomic clock. Read this manual carefully to fully explore the
features and functions of the new product.
ABOUT WWVB (Radio Controlled Time)
The NIST (National Institute of Standards and Technology—Time and Frequency Division)
WWVB radio station is located in Ft. Collins, Colorado, and transmits the exact time and date
signal continuously throughout the United States at 60 kHz. The signal can be received up
to 2,000 miles away through the internal antenna in the Weather Station. However, due to
the nature of the Earth’s Ionosphere, reception is very limited during daylight hours. The
Weather Station will search for a signal every night when reception is best. 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. For more
information on the atomic clock and WWVB please see the NIST website at
http://www.boulder.nist.gov/timefreq/stations/wwvb.htm.
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