Time signal radio stations

thumb|Low-cost DCF77 receiver

signal used as a reference to determine the time of day

series of six short tones broadcast at one-second intervals by many BBC Radio stations

shortwave radio station broadcasting time signals

Cuban radio station

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thumb|right|300px|WWVH antenna field WWVH is the callsign of the U.S. National Institute of Standards and Technology's shortwave radio time signal station located at the Pacific Missile Range Facility Barking Sands, in Kekaha, on the island of Kauai in the state of Hawaii.

RWM is the callsign of a high frequency (shortwave) standard frequency and time signal radio station in Moscow, Russia. It is controlled by All-Russian Scientific Research Institute for Physical-Engineering and Radiotechnical Metrology, and operated by Russian Television and Radio Broadcasting Network. Transmitting frequencies are 4.996 MHz with 5 kW and on 9.996 and 14.996 MHz with 8 kW.

architectural structure

JJY is the call sign of a low frequency time signal radio station located in Japan.

WWVB is a longwave time signal radio station near Fort Collins, Colorado, and is operated by the National Institute of Standards and Technology (NIST). Most radio-controlled clocks in North America use WWVB's transmissions to set the correct time.