The initial scripted announcement was: "We interrupt this program. This is a national emergency. The President of the United States or his designated representative will appear shortly over the Emergency Broadcast System."
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 of the United States
- Statewide emergency information
- Local emergency information (for a station's operational area, i.e. evacuation and sheltering plans, and severe weather)
- National programming and news (other than a presidential message)
https://en.wikipedia.org/wiki/Emergency_Broadcast_System
Until the system was suspended, radio and television stations were required to perform a Weekly Transmission Test of the Attention Signal and Test Script randomly 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 doing so 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 these stations 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.
https://en.wikipedia.org/wiki/Emergency_Broadcast_System
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