Abstract
In Germany in 1904, Christian Hülsmeyer used a copy of Hertz’s apparatus to demonstrate the reception of radiation reflected from a ship, thereby introducing a first primitive version of radar, albeit without range information. In the early years of the twentieth century, the ingenious inventor Guglielmo Marconi (1874–1937) was instrumental in the development of radio communication and broadcasting at long wavelengths of deca- and hectometres. The antennas were wire dipoles. In the early 1930s, Marconi used parabolic dishes of 3 m diameter in a demonstration of telephony across the English Channel at a frequency near 1.7 GHz. Radar was developed in several countries in the late 1930s and was put to use intensely in World War II, using paraboloidal reflectors at decimetre wavelengths. Great secrecy surrounded these latter activities.
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Baars, J.W.M., Kärcher, H.J. (2018). Birth of Radio Astronomy. In: Radio Telescope Reflectors. Astrophysics and Space Science Library, vol 447. Springer, Cham. https://doi.org/10.1007/978-3-319-65148-4_3
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