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Duck and Cover!
From the Korean War up till 1952, ham radio operators were by law required to monitor a.m. broadcast radio every 10 minutes, or have a device connected to their transmitter that would notify them of a CONELRAD (Containment of Electromagnetic Radiation) alert, and automatically shut down their transmitter.
A CONELRAD activation meant we were under nuclear attack.
Chilling nostalgia.
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