The short-wave era in commercial long-distance radio
communication began with the revolutionary discovery of
the “daylight” wave by Guglielmo Marconi in October
1924, when a series of experiments which had begun in the
spring of 1923, systematically culminated in successful daytime
transatlantic communication at 32 m of wavelength.
Soon after Marconi’s epoch-making discovery, short
waves, which in those days were defined as wireless
waves below 200 m, began replacing long waves (in
the 60 kHz–150 kHz range, or 5 km–2 km waves) for
transoceanic communications. Short-wave communication
with 15 m was soon found to be better than that with
32 m. Short waves became the workhorse of worldwide
communications until the late 1960’s, when satellite
communications began replacing its functions. Short-wave
communication was the main medium with which World
War II was conducted.
In this reprinted paper (the record of the address Marconi
delivered on October 17, 1927, in New York City), Marconi
describes the details of this discovery in the context of the
contemporary technological state of wireless communications.
A short time after Marconi’s 1927 address, Appleton explained
the long-distance propagation of the daylight wave
through a new mechanism of ionospheric reflection through
the “F ” layer that often goes by his name (as opposed to
the ionospheric “E” layer, the Heavyside–Kennelly layer
that explained propagation of Marconi’s original transatlantic
propagation of “long” waves). Appleton received the
Nobel prize in physics in 1947 for the discovery of the
ionospheric “F” layer, explaining Marconi’s achievements.
The reader is urged to read this reprint of Marconi’s
address thoroughly to get a first-hand glimpse of the excitement
generated by his pioneering work.
The short-wave era in commercial long-distance radiocommunication began with the revolutionary discovery ofthe “daylight” wave by Guglielmo Marconi in October1924, when a series of experiments which had begun in thespring of 1923, systematically culminated in successful daytimetransatlantic communication at 32 m of wavelength.Soon after Marconi’s epoch-making discovery, shortwaves, which in those days were defined as wirelesswaves below 200 m, began replacing long waves (inthe 60 kHz–150 kHz range, or 5 km–2 km waves) fortransoceanic communications. Short-wave communicationwith 15 m was soon found to be better than that with32 m. Short waves became the workhorse of worldwidecommunications until the late 1960’s, when satellitecommunications began replacing its functions. Short-wavecommunication was the main medium with which WorldWar II was conducted.In this reprinted paper (the record of the address Marconidelivered on October 17, 1927, in New York City), Marconidescribes the details of this discovery in the context of thecontemporary technological state of wireless communications.A short time after Marconi’s 1927 address, Appleton explainedthe long-distance propagation of the daylight wavethrough a new mechanism of ionospheric reflection throughthe “F ” layer that often goes by his name (as opposed tothe ionospheric “E” layer, the Heavyside–Kennelly layerthat explained propagation of Marconi’s original transatlanticpropagation of “long” waves). Appleton received theNobel prize in physics in 1947 for the discovery of theionospheric “F” layer, explaining Marconi’s achievements.The reader is urged to read this reprint of Marconi’saddress thoroughly to get a first-hand glimpse of the excitementgenerated by his pioneering work.
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