is the callsign
of a longwave time signal
radio station similar to WWVB
. The station is located in Japan
, operated by a branch of the Japanese government known as the Communications Research Laboratory
. JJY broadcasts a 50 kW signal on 40 kHz from a transmitter site on Mount Otakadoya, near Fukushima
(37°22'N, 140°51'E), and a separate 50 kW signal on 60 kHz from a transmitter site on Mount Hagane (33°28'N, 130°11'E), located on Kyushu Island. Both carrier signals contain an identical pulse-width modulated
time code, and are transmitted 24 hours a day. The format of this time code is not the same as that used by WWVB.
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