These bits are generated at WWVB by raising and lowering the power of the signal. The lowest frequency received by any of the other radios in your house is probably 530 kHz, the bottom of the AM broadcast band.Įven that frequency is nearly 10 times higher than the WWVB signal. This is an appropriate name, because the FM radio and TV broadcasts that we are accustomed to listening to use frequencies thousands of times higher. Your radio controlled clock actually has a miniature radio receiver inside, which is permanently tuned to receive the 60 kHz signal. This page provides information about radio controlled clocks, including how they work, where they work, and what to do when they dont work.Īn atomic clock has an atomic oscillator inside (such as a cesium or rubidium oscillator).Ī radio controlled clock has a radio inside, which receives a signal that comes from a place where an atomic clock is located. They have a tremendous advantage over conventional clocks, they are always right When working properly, radio controlled clocks always display the correct time, down to the exact second.ĭuring the transition from standard time to daylight saving time (DST) they spring forward one hour, and when DST is finished they fall back one hour. These clocks are sold in all forms: as wall clocks, desk clocks, travel alarms, and wristwatches. Note that the red area is largest at night, and smallest in the daytime (click on the map to see a larger image).
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