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

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Edwin Howard Armstrong

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How FM Radio Began

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.
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    • Essentials 

    • Personal 

    • Regenerative circuit 

    • Superheterodyne circuit 

    • Wide-band FM radio 

    • FM radar 

    • Death 

    • Legacy