Today in History: June 11
The inventor Edwin Howard Armstrong gave a demonstration of FM radio to an audience of engineers and everyday listeners 80 years ago today.
Anyone who has listened to an AM broadcast for more than a few hours has encountered its drawbacks: crackles, hisses, static-y noises, pops. Armstrong, building on 15 years of research into high frequency signals, had devices that could send and receive high frequency signals. Armstrong played a jazz record through AM equipment and then through FM. A reporter who was there wrote, “If the audience of 500 engineers had shut their eyes they would have believed the jazz band was in the same room. There were no extraneous sounds.” It worked, yet the FM radio era lay decades off in the future.
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