Edwin Howard Armstrong: The Forgotten Father of FM

A Revolution in Sound

On November 6, 1935, engineer Edwin Howard Armstrong stood before the Institute of Radio Engineers in New York. The title of his presentation sounded dry:
“A Method of Reducing Radio Disturbance Through a Frequency Modulation System.”

But the idea he unveiled was nothing short of revolutionary. Armstrong had invented FM radio—a way to transmit sound without the static and distortion of AM. For the first time, listeners could hear music and voices with astonishing clarity.

It should have been his moment of glory. Instead, it was the start of a battle that would consume him.

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The Innovator Who Changed Radio

Armstrong was no stranger to breakthroughs. His earlier inventions—the regenerative circuit and the superheterodyne receiver—laid the foundation for practical, reliable radio.

But each success also created enemies. Giant corporations like AT&T, Westinghouse, and RCA had fortunes tied up in existing technologies. Armstrong’s brilliance threatened their bottom line.

And FM radio was the greatest threat of all.

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Corporate Resistance and FCC Reversal

In the late 1930s, Armstrong built an experimental FM network, operating between 42 and 49 MHz. Engineers marveled at its performance. For a brief moment, the future of radio seemed his to shape.

But RCA wasn’t about to let FM eclipse their AM empire. After years of lobbying, they scored a decisive blow. In 1945, the FCC shifted FM broadcasting to a new band—88 to 108 MHz—instantly making Armstrong’s network obsolete.

Decades of work, millions in investment, and a nationwide head start vanished with the stroke of a pen.

To make matters worse, new FCC rules capped FM broadcast power, cutting station reach and crippling adoption. RCA turned its attention to the rising world of television, leaving Armstrong isolated and embattled.

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