The primary plan for alerting broadcast stations that are currently being considered by the FCC Study Group is known as the Key Station System. According to an FCC document created during the 'Informal Government–Industry Technical Conference' on March 26, 1951: The CONELRAD concept was originally known as the Key Station System. Such bulletins were the forerunner to CONELRAD. However, broadcasters would typically interrupt normal programming to issue emergency bulletins, as happened during the attack on Pearl Harbor on Decemand the first successful tornado warning in 1948. government to communicate with citizens during an emergency. Car radio with CONELRAD frequencies marked with small red marks First commercial transistor radio Regency TR-1 with small red dial markingsīefore 1951, there was no systematic way for the U.S. History 'CD Mark' symbols (usually simple white or red triangles) at CONELRAD's 6 kHz frequencies were on the dials of most radios sold in the US between 19. However, the system's alerting protocol could be used for alerting of a natural disaster by 1957.

Unlike the EBS and EAS, CONELRAD was never intended for use in local civil emergencies such as severe weather.

After the development of intercontinental ballistic missiles reduced the likelihood of a bomber attack, CONELRAD was replaced by the Emergency Broadcast System (EBS) on August 5, 1963, which was later replaced by the Emergency Alert System (EAS) on Januall have been administered by the Federal Communications Commission (FCC). It was intended to allow continuous broadcast of civil defense information to the public using radio stations, while rapidly switching the transmitter stations to make the broadcasts unsuitable for Soviet bombers that might attempt to home in on the signals (as was done during World War II, when German radio stations, based in or near cities, were used as beacons by bomber pilots). Emergency Broadcast System (as Emergency Action Notification System)ĬONELRAD ( Control of Electromagnetic Radiation) was a method of emergency broadcasting to the public of the United States in the event of enemy attack during the Cold War.

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