La Crosse Technology WS-9037U-IT - Manual (Page 43)

16
Section 3 - OUTDOOR TEMPERATURE
• Display current outdoor temp
• Display daily maximum and minimum outdoor temperature
ATOMIC TIME - 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 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 Temperature Station. However, due to
the nature of the Earth’s Ionosphere, reception is very limited during daylight hours. The
wireless weather station will search for a signal every night when reception is best.
The WWVB radio station receives the time data 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 detail, visit http://www.boulder.nist.gov/timefreq.htm. To listen
to the NIST time, call (303)499-7111. This number will connect you to an automated time,
announced at the top of the minute in “Coordinated Universal Time”, which is also known
as Greenwich Mean Time (GMT). This time does not follow Daylight Saving Time changes.
After the top of the minute, a tone will sound for every second. It is possible that your