La Crosse Technology WS-7025U Instruction Manual

Also see for WS-7025U: Instruction manual Instruction manual

Contents

La Crosse Technology WS-7025U Instruction Manual Manual pdf 4 page image

4ABOUT WWVB (Radio Controlled Time)The NIST (National Institute of Standards and Technology—Time and FrequencyDivision) WWVB radio station is located in Ft. Collins, Colorado and transmits theexact time signal continuously throughout the United States at 60 kHz. The signalcan be received up to 2, 000 miles away through the internal antenna in the weatherstation. However, due to the nature of the earth’s ionosphere, reception is verylimited during daylight hours. The weather station will search for a signal everynight when reception is best. The WWVB radio station derives its signal from theNIST Atomic clock in Boulder, Colorado. A team of atomic physicists iscontinually measuring every second, of every day, to an accuracy of ten billionths ofa second per day. These physicists have created an international standard measuringa second as 9,192,631,770 vibrations of a Cesium-133 atom in a vacuum.