Detailed information about radio-controlled clocks and troubleshooting tips are available on the NIST web page describing WWVB radio-controlled clocks. Some of the more common problems include incorrectly setting your local time zone on the clock, batteries that need to be replaced, and interference from other electrical devices such as refrigerators and computer monitors. What should I do if my radio-controlled clock is not working? The WWVB broadcast covers most of the continental United States during the daytime hours, and the coverage area increases at night.įor more information, see the section on NIST radio broadcasts. These clocks and watches typically synchronize overnight and keep time between synchronizations using an internal quartz crystal oscillator. Collins, Colorado and it continuously broadcasts a time code on a carrier frequency of 60 kHz. The broadcast station is located near Ft. These are sometimes marketed as "atomic clocks", but we recommend that they be referred to as "radio-controlled clocks". There are many commercial manufacturers who make clocks that receive time signals from NIST radio station WWVB. Double-clicking the desktop clock should lead to the options available.Ĭan I buy a clock or watch that automatically sets itself to NIST time? Several computer operating systems have an option to automatically synchronize the computer clock to NIST time servers. How do I synchronize my computer to NIST time?Ī computer can be synchronized to NIST via the Internet using our Internet Time Service (ITS) or via a telephone line (through a modem) using our Automated Computer Time Service (ACTS). However, the idea is still under consideration. NIST has considered streaming the audio from WWV/WWVH via the Internet, but because of audio buffering, the time announcement could be several seconds off and would vary for different users. Why can't I hear WWV/WWVH on the Internet? The site provides a time-of-day service, and it should not be used to measure frequency or time interval, nor should it be used to establish traceability to NIST. This delay is measured using your computer clock as a timer each time synchronization is made. There is an accuracy statement based on a measurement of the round-trip network delay. The current time is shown on the Internet at - it synchronizes with NIST every ten minutes. Where can I see NIST time on the Internet? These services are not affiliated with NIST. There are other local time telephone services in operation. Note: The use of cellular phones can add a small delay to the broadcast. When calling these numbers, you will hear the same audio that is broadcast by WWV and WWVH, respectively. Calls from outside the local area may be subject to long-distance charges. Please note that these are not toll-free numbers. There are two telephone numbers that allow you to listen to NIST time: The announcement of the time occurs at the top of each minute and states Coordinated Universal Time (UTC) so it will be necessary to adjust the hour to your local time zone.įor more information about the stations, see the Time and Frequency Radio Broadcast section. WWVH in Kauai, Hawaii broadcasts on 2.5, 5, 10 and 15 MHz.Collins, Colorado broadcasts on 2.5, 5, 10, 15 and 20 MHz NIST continually broadcasts the time using shortwave radio signals from two radio stations: What should I do if my radio-controlled clock is not working?.Can I buy a clock or watch that automatically sets itself to NIST time?.How do I synchronize my computer to NIST time?.Why can't I hear WWV/WWVH on the Internet?.Where can I see NIST time on the Internet?.How to get the time using a telephone, computer or radio signals.
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