La Crosse Technology WT-5600 instruction manual RADIO-CONTROLLED Time and Date

B.RADIO-CONTROLLED TIME AND DATE

1.The projection alarm will automatically search for the time signal upon initial set-up and every night.

2.When the signal is being received, there will be a “tower” icon flashing to the right of the time display.

3.When the time signal has been received successfully, the tower icon will remain steady until midnight.

4.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 Projection Alarm.

5.Due to the nature of the Earth’s Ionosphere, reception is very limited during daylight hours. The Projection alarm will search for a signal every night when reception is best.

6.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.

7.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.

8.It is possible that your Projection Alarm may not be exactly on the second due to the variance in the quartz. However, the clock will adjust the quartz timing over the course of several days to be very accurate; under 0.10 seconds per day.

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