Title :
Some aspects of the genesis of radio engineering
Author :
Harrison, Charles W., Jr.
Abstract :
In the early days of wireless communication, radio-frequency power was generated by spark, Poulsen-arc, and Alexanderson alternator transmitters. Multituned antennas used for transmission in the low-kHz portion of the electromagnetic spectrum are reviewed. These antennas were used in transatlantic-radio communication during the following World War I. Wavelengths in use were between 10 and 20 thousand meters (30 and 15 kHz). For AM broadcasting (beginning in 1920), T-configured antennas and vertical radiators were used. Antennas for radio reception were normally outdoor, inverted-L and -T structures, which worked well with crystal, regenerative, and neutrodyne receivers. Indoor-loop antennas proved efficacious with superheterodyne sets because of the great sensitivity of these receivers.<>
Keywords :
broadcast antennas; history; radio receivers; radio transmitters; radiocommunication; receiving antennas; 10 to 20 km; 15 to 30 kHz; AM broadcasting; Alexanderson alternator; Poulsen-arc; T-configured antennas; VLF; history; inverted-L antennas; inverted-T antennas; loop antennas; multituned antennas; radio engineering; radio reception; spark telegraphy; vertical radiators; wireless communication; Alternators; Power engineering and energy; Power generation; Radio frequency; Radio transmitters; Receivers; Receiving antennas; Sparks; Transmitting antennas; Wireless communication;
Journal_Title :
Antennas and Propagation Magazine, IEEE
