In 1935, Edwin Armstrong presented his groundbreaking paper on Frequency Modulation (FM) transmission to the Institute of Radio Engineers. Armstrong’s FM transmission concept introduced a method of encoding information on a carrier wave by varying its frequency, rather than its amplitude. This innovation significantly reduced the static and interference commonly experienced with Amplitude Modulation (AM) transmissions, offering clearer and more reliable audio signals. Armstrong’s work on FM transmission revolutionized radio broadcasting and communication technologies. For amateur radio operators, FM became a preferred mode for local and mobile communications, enhancing the quality and reliability of their transmissions and further advancing the capabilities of amateur radio.
