Emergency Broadcast System

Emergency Broadcast System

:"For the record label, see Emergency Broadcast System Records. For the multimedia group, see Emergency Broadcast Network."

The Emergency Broadcast System (EBS) was an emergency warning system in the United States, used from 1963 to 1997, when it was replaced by the Emergency Alert System.


"The Emergency Broadcast System was . . . established to provide the President of the United States with an expeditious method of communicating with the American public in the event of war, threat of war, or grave national crisis."Citation
title=Emergency Broadcast System: The Lifesaving Public Service Program
date=March, 1978
publisher= United States Defense Civil Preparedness Agency
] It replaced CONELRAD on August 5, 1963. [Citation
title=City's Civil Defense Sirens Will Be Tested Tomorrow
newspaper=The New York Times
publication-place=New York, NY
date=October 5, 1963
] In later years, it was expanded for use during peacetime emergencies at the state and local levels.Although the system was never used for a national emergency, it was activated more than 20,000 times between 1976 and 1996 to broadcast civil emergency messages and warnings of severe weather hazards. Some dramatic works depicting nuclear warfare (most notably the 1983 made-for-TV film "The Day After") included fictionalized scenes of EBS activations.

National Level EBS

An order to activate the EBS at the national level would have originated with the President and been relayed via the White House Communications Agency duty officer to one of two origination points: either the Aerospace Defense Command or the Federal Preparedness Agency--as the system stood in 1978. Participating telecommunications common carriers, radio and television networks, the Associated Press and United Press International would receive and authenticate (by means of code words) an Emergency Action Notification via an EAN teletypewriter network designed specifically for this purpose. These recipients would relay the EAN to their subscribers and affiliates

The release of the EAN by the ADC or FPA would initiate a process by which the common carriers would link otherwise independent networks such as ABC, CBS and NBC into a single national network that even independent stations could receive programming from. "Broadcast stations would have used the two-tone Attention Signal on their assigned broadcast frequency to alert other broadcast stations to stand by for a message from the President." Note that the transmission of programming on a broadcast station's assigned frequency, and the fact that television networks/stations could participate, distinguished EBS from CONELRAD. EBS radio stations would not transmit on 640 or 1240 AM, and television stations would carry the same audio program as AM radio stations.

Activation procedure

Actual activations originated with a primary station, which would transmit the Audio|Emergency broadcast system.ogg|Attention Signal. This Attention Signal most commonly associated with the EBS was a combination of the sine waves of 853 and 960 Hz. Decoders at relay stations would sound an alarm, alerting the station operator to the incoming message. Then each relay station would broadcast the alert tone and rebroadcast the emergency message from the primary station. The sine wave combination for the EBS signal was seen on the EBS slide from WXYZ-TV in Detroit, Michigan from late 70s to 1992.

A nationwide activation of the EBS was called an Emergency Action Notification (EAN). This was the only type of activation which broadcast stations were not allowed to ignore; the FCC made local civil emergencies and weather advisories optional (except for stations that had agreed to be the "primary" source of such messages).

To activate the EAN protocol, the AP and UPI wire services would notify stations with a special message. It began with a full line of X's, and a bell inside the teletype machine would sound ten times. To avoid abuse and mistakes, the message included a confirmation password which changed daily. Stations that subscribed to one of the wire services were not required to activate the EBS if the activation message did not have proper confirmation.

False alarm of 1971

Despite these safeguards, the system was inadvertently activated at 9:33 AM EST on February 20, 1971. Teletype operator W. S. Eberhardt accidentally "played the wrong tape" during a test of the system. [http://stlradio.net/pix/ebsaccident5.jpg, linked from http://stlradio.net/pages/ebsaccident.htm] As a result, an EBS activation message authenticated with the codeword "hatefulness" was sent through the entire system, ordering stations to cease regular programming and broadcast the alert of a national emergency. A cancellation message was sent at 9:59 AM EST; however, it used the same codeword again. A cancellation message with the correct codeword, "impish," was not sent until 10:13 AM EST. [http://stlradio.net/pix/ebsaccident3.jpg]

This false alarm demonstrated major flaws in the EBS system. Many stations had not received the alert, but more importantly, the vast majority of those that did ignored it, or did not know what to do during an emergency [ [http://stlradio.net/pages/ebsaccident.htm St. Louis Media Info & Links ] ] . The only station in the country that shut down as mandated by FCC rules was WSNS-TV (Ch 44) in Chicago. Numerous investigations were launched, and several changes were made to the EBS. Among them, the on-air alert announcement was streamlined, eliminating language that warned the audience of an imminent attack against the country.

"If This Had Been an Actual Emergency..."

Although it was never used, the FCC's EBS plan involved detailed procedures for stations to follow during an EAN. It included precise scripts that announcers were to read at the outset of the emergency and whenever detailed information was scarce. Among other things, citizens were instructed not to use the telephone, but rather continue listening to broadcast stations for information.

As official information began to emerge from various sources, non-primary stations were to broadcast it according to the following priority list:

* Messages from the president
* Statewide emergency information
* Local emergency information (for a station's operational area, i.e. evacuation and sheltering plans)
* National programming and news (other than a presidential message)

A presidential message was always required to be aired live during an EAN. For other information, stations were to follow the priority list to decide what should be disseminated first. Lower priority official programming was to be recorded for the earliest available rebroadcast.

Participation in EAN emergency broadcasting was done with the "voluntary cooperation" of each station (as noted in the classic test announcement). Stations that were not prepared to be part of the national EBS network were classified as "non-participating" by the FCC. During an EAN, a non-participating station was required to advise listeners/viewers to tune elsewhere to find emergency bulletins. The station's transmitter would then be turned off. Non-participating stations had to remain off-the-air until the EAN was terminated. Under no circumstances could any broadcast station continue with normal programming during a national emergency.

Testing the system

Until the system was superseded, radio and television stations were required to perform a "Weekly Transmission Test Of The Attention Signal and Test Script" on random days and times between 8:30 A.M and local sunset. Stations were required to perform the test at least once a week and were only exempt from performing the test if they had activated the EBS for a state or local emergency or participated in a coordinated state or local EBS test during the past week. Additionally, stations were required to log tests they received from each station they monitored for EBS messages. This served as an additional check, as they could expect to hear a weekly test from each source. Failure to receive a signal at least once a week meant that either the monitored station was having a problem transmitting the alert signal, or the monitoring station was having a problem receiving it.

Original plan

Early in the history of the EBS, tests and activations were initiated in a similar way to CONELRAD tests. Primary stations would turn their transmitters off for five seconds, back on for five seconds, off for five seconds more, then would go back on air and transmit a 1000 Hz tone for 15 seconds to alert secondary stations. This quick off-and-on became known to broadcast engineers as the "EBS Stress Test", as older transmitters would sometimes fail after the quick cycling on and off. [ [http://www.oldradio.com/current/bc_conel.htm Broadcast History ] ] This became unnecessary as broadcast technology advanced and the two-tone alarm was developed.

Later test pattern

Later on, the EBS Stress Test was scrapped in favor of the following procedure:

1) Normal programming was suspended. Television stations would transmit a video slide such as the one illustrating this entry (numerous designs were available over the years). One of the following announcements written below was transmitted:

*"This is a test. For the next sixty" (or thirty) "seconds, this station will conduct a test of the Emergency Broadcast System. This is only a test."
*"(name of host station in a particular market) "is conducting a test of the Emergency Broadcast System. This is only a test."
*"This is a test. This station is conducting a test of the Emergency Broadcast System. This is only a test."
*"The following is a test of the Emergency Broadcast System."

2) The Attention Signal was transmitted from the EBS encoder for 20 to 25 seconds. At the special request of the FCC, however, this step was occasionally (though rarely) skipped.

3) The announcement written below (depending on the variation) was transmitted. The first part read:

*"This is a test of the Emergency Broadcast System. The broadcasters of your area in voluntary cooperation with the FCC and other authorities" (or, in later years, "federal, state and local authorities") "have developed this system to keep you informed in the event of an emergency."

There were a number of variations for the second half of the statement. During the early days of the system, stations other than the designated primary station for an operational area were required to shut down in the event of an emergency (reminiscent of the CONELRAD days), and the message was a variation of:

*"If this had been an actual emergency, you would have been instructed to tune to one of the broadcast stations in your area."
*"If this had been an actual emergency, you would have been instructed where to tune in your area for news and official information".

In later years, as it became easier for stations to record and relay messages from a primary station, and the risk of hostile bombers using broadcast signals to navigate lessened due to the development of ICBMs, the requirement to shut down in the event of activation was dropped, and the message became:

*"If this had been an actual emergency, the Attention Signal you just heard would have been followed by official information, news or instructions."

As the EBS was about to be replaced by its successor, the aforementioned Emergency Alert System, some stations used the following variant:

*"This station is testing its Emergency Broadcast System equipment. The EBS will soon be replaced by the Emergency Alert System; the EAS will provide timely emergency warnings."

The test concluded with one of the following phrases:
*"(sponsoring station in a particular market) "serves the" (name of operational area) "area. This concludes this test of the Emergency Broadcast System."

*"This station serves the" (name of operational area) "area. This concludes this test of the Emergency Broadcast System."

These variations were heard in different parts of the country throughout the years depending on FCC regulations at the time, local preferences, and whether the specific station performing the test was a primary EBS station or not. At least one version made explicit reference to an attack on the United States as being a possible scenario for EBS activation. The announcement text was mandated by the FCC.

Stations had the option of either reading the test script live, or using recorded versions. Jingle producer Terry Moss (of "L.A. Air Force" fame) offered a sung version of the most common script on his "Cheap Radio Thrills" (http://www.danoday.com/CheapRadioThrills) and WHEN radio in Syracuse, New York had their own sung version. [http://www.conelrad.com/media/tm/tm_01.ram] In the late 1970s, however, the FCC prohibited singing the test script or reading it as if it were a joke.Fact|date=July 2007

Purpose of the test and cultural impact

The purpose of the test was to allow the FCC and broadcasters to verify that EBS tone transmitters and decoders were functioning properly. In addition to the weekly test, test activations of the entire system were conducted periodically for many years. These tests showed that about 80% of broadcast outlets nationwide would carry emergency programming within a period of five minutes when the system was activated.

The weekly broadcast of the EBS test message made it part of American cultural fabric of the era, and became the subject of all kinds of jokes and skits. Several people have testified about being frightened by the Test Pattern as children, and actual emergencies scared them even more.

ee also

*Four minute warning

Bibliographic Notes

The Defense Civil Preparedness Agency publication "The Emergency Broadcast System: The Lifesaving Public Service Program" is in the collection of the University of Central Florida Libraries, and may be available at other larger academic, public, or depository libraries.


External links

* [http://www.straightdope.com/mailbag/m-ebs.html What happened to the Emergency Broadcast System?] by Cecil Adams, Chicago Reader
* [http://ebstest.stlmedia.net/ Personal remembrance of the 1971 false alarm] with scans of relevant teletype messages and immediately following UPI story
* [http://www.conelrad.com/media/tm/tm_01.ram An atypical EBS Test from WHEN Syracuse c. 1975, arranged in the style of a radio jingle] Real Audio
* [http://www.youtube.com/watch?v=BdXMWpcQNT0 A test of the EBS from WCBS-TV in New York City, c. 1970s]
* [http://www.youtube.com/watch?v=9SmKDWRLEME&feature=related A test of the EBS from WHAS-TV Louisville, KY, c. 1994]
* [http://www.retrojunk.com/details_commercial/5323/ An EBS Test from KGO-TV in San Francisco, c. 1990]
* [http://www.amandfmmorningside.com/wpgc_misc_audio_1981_07_05th_ebs_test_dave_foxx.wma An EBS Test from WPGC in Washington D.C., c. 1981] Windows Media Player is required to hear this file.
* [http://filcro.com/Emergency-Alert-System.html A history of CONELRAD to EBS to EAS from Filcro Media 1951 - 2008, c 2008] The convergent role of each government agency

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