WWVH and WWV

WWV and WWVH TIME SIGNAL.

WWV.

WWV is the callsign of United States National Institute of Standards and Technology shortwave radio time signal station. It is located near Fort Collins, Colorado.

Since 1945, it has broadcast a continuous time signal and has transmitters on 2.5, 5, 10, 15, and 20 MHz.

Above:- The 15MHz antenna of WWV. Image c/o Wikipedia.

WWVH.

WWVH is the callsign of the United States National Institute of Standards and Technology's shortwave radio time signal station. It is located at the Barking Sands Missile Range, in Kekaha, on the island of Kauai in the state of Hawaii.

Above:- The WWVH antenna field. Image c/o Wikipedia.

WWV and WWVH simultaneously transmit on the same frequencies. In order to differentiate itself, WWV uses a male voice, while WWVH uses a female voice. WWV's voice announcement is 7.5 seconds before the minute tone. WWVH's voice announcement is 15 seconds before the minute to ne.

NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY (NIST).

The Mission of the NIST is:

"To promote U.S. innovation and industrial competitiveness by advancing measurement science, standards, and technology in ways that enhance economic security and improve our quality of life."