WWVB is a 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.

History Launch. WWV is the oldest continuously-operating radio station in the United States, first going on the air from Washington, D.C. in May 1920, approximately six months before the launch of KDKA.

DCF77 is een tijdseinzender die vanuit Mainflingen in Duitsland via de lange golf op een frequentie van 77,5 kHz met een vermogen van 50 kW een signaal uitzendt dat binnen een straal van meer dan 1500 km te ontvangen is.

jjy(ジェイ・ジェイ・ワイ)とは、日本標準時を送信する日本の無線局である 。 総務省所管の独立行政法人 情報通信研究機構(nict)が運用している 。

Sendeanlage in Mainflingen; drei der 200 m hohen Maste halten die Antenne mit Dachkapazität für DCF77.

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