Defense: Sign-off for conelrad

Back in 1951, when the U.S. began to worry about Russian-atom armed bombers, somebody had a notion that the invaders might steer by the crisscrossing waves of U.S. commercial broadcasting stations. Probably Russian navigators were never so helpless as that, but an official system, Conelrad (for Control of Electromagnetic Radiation), was set up to foil them. Under Conelrad regulations, all regular broadcasting would go silent during an attack, while stations going on and off the air on two special frequencies, 640 and 1240 kc., would stand ready to give instructions and comfort to the quaking population.

Conelrad continued for nearly twelve...

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