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In page Emergency Broadcast System:

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The purpose of the tests was to allow the FCC and broadcasters to verify that EBS tone transmitters and decoders were functioning properly. In addition to the weekly tests, 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 if it had ever become necessary to activate the EBS at the national level.[citation needed]