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31/01/1954 American electrical engineer and inventor Edwin Howard Armstrong dies

1:41

How FM Radio Began

23:24

Edwin Howard Armstrong

He is best known for developing FM (frequency modulation) system. FM is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. This contrasts with amplitude modulation, in which the amplitude of the carrier wave varies, while the frequency remains constant.
    • Essentials 

    • Personal 

    • Early work 

    • Wide-band FM radio 

    • FM Doppler radar 

    • Death 

    • Legacy