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WGU-20
WGU-20, also known as "the last radio station," was operated by the United States Defense Civil Preparedness Agency (one of the two agencies later merged to become the Federal Emergency Management Agency) in the mid-to-late 1970s.
==Public Emergency Radio==
Operating 24 hours a day on a longwave frequency of 179 kHz from Chase, Maryland, WGU-20's programming consisted of pre-recorded announcements and time checks. The transmitter was situated at 39°21'3.4"N 76°20'44.7"W and used as antenna a single-mast antenna with a height of 219.45 metres ( 720 ft), which was demolished in 2011. The broadcast had the mechanical sound of early speech synthesis systems but the message could be clearly understood, with time ticks in the background and a continuous announcement akin to the speaking clock:
(The recording was changed to "good morning" or "good afternoon" at the appropriate times of day.)
Utilizing the world's first all-solid state, 50,000 watt, radio transmitter built by Westinghouse, the signal covered much of the eastern seaboard. WGU-20 was something of a mystery initially, with thousands of ham radio operators and radio hobbyists speculating about the nature of the station, until a small news article in ''Popular Electronics'' magazine outlined exactly what WGU-20 was. Afterwards, reception reports (some from as far away as Texas) were sent a special QSL card featuring Paul Revere on a horse, raising the alarm.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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