3
INVENTORY OF CONTENTS
1.
WS-7394U—indoor weather station
2.
TX6U—remote temperature
(temperature/humidity) sensor
3.
Instruction manual and warranty card
ADDITIONAL EQUIPMENT (not
included)
1.
Five fresh AA 1.5V alkaline batteries.
2.
One wall-mounting screw (optional)
ABOUT WWVB (radio-controlled time)
The NIST (National Institute of Standards and Technology—Time and
Frequency Division) radio station, WWVB, is located in Ft. Collins, Colorado
and transmits the exact time 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 indoor weather station. However, due to the nature of the Earth’s
Ionosphere, reception is very limited during daylight hours. The indoor 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 continually measure every second of
every day to an accuracy of ten billionths of a second a 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 about
WWVB please see the NIST website at
http://www.boulder.nist.gov/timefreq/stations/wwvb.htm
