Alexanderson Day, named after the Swedish radio engineer Ernst Fredrik Werner Alexanderson[1] and held either on the last Sunday in June, or on the first Sunday in July, whichever comes closer to 2 July, is the day of the open house at the Swedish government VLF transmitter Grimeton, call sign SAQ, located near Varberg. On Alexanderson Day, Christmas Eve, and at other times during the year, the only workable Alexanderson alternator transmitter in the world is used to transmit short Morse messages on 17.2 kHz, which should be easily receivable in all of Europe. The transmitter is preserved as a historical remnant of early radio technology and as an example of VLF (Very Low Frequency) equipment.[2]
These transmissions cannot be received by ordinary radios because of their low frequency. Modern enthusiasts often monitor the transmissions using a PC with a coil connected to the soundcard input and FFT analysis software, or a short-wave receiver with an upconverter, or any of several receivers designed to receive VLF transmissions directly. In recent years, Software-defined radio receivers have proven to be very useful and effective in receiving transmissions from SAQ around the world.[3]
^"Grimeton VLF Transmitter". Atlas Obscura.
^"Grimeton Radio Station - Unesco World Heritage Site | For World Heritage Travellers". www.worldheritagesite.org.
^"Sweden's SAQ Alexanderson Alternator Station Receives Nearly 300 Reports". www.arrl.org.
AlexandersonDay, named after the Swedish radio engineer Ernst Fredrik Werner Alexanderson and held either on the last Sunday in June, or on the first...
An Alexanderson alternator is a rotating machine invented by Ernst Alexanderson in 1904 for the generation of high-frequency alternating current for use...
Alexanderson is a surname meaning "Son of Alexander". Notable people with the surname include: Ernst Alexanderson (1878–1975), Swedish-American electrical...
transmitter is still in operational condition, and each year on a day called AlexandersonDay is started up and transmits brief Morse code test transmissions...
International Co-operative Day International Free Hugs Day Navy Days (Netherlands) Navy Day (Ukraine) Youth Day (Singapore) AlexandersonDay (Sweden) NAIDOC Week...
monument, can be visited by the public at certain times, such as on AlexandersonDay. Due to its long propagation distances and stable phase characteristics...
Ralph P. (1995). "What Augustine Didn't Say About Mathematicians". In Alexanderson, Gerald L.; Mugler, Dale H. (eds.). Lion Hunting and Other Mathematical...
United States and South America. The Navy had installed a high-powered Alexanderson alternator, built by General Electric (GE), at the American Marconi transmitter...
Radio Station facility in Grimeton, is the last remaining operational Alexanderson alternator long-wave transmitter. Although the station ended regular...
antitrust violations and was ordered to divest itself of RCA. In 1927, Ernst Alexanderson of GE made the first demonstration of television broadcast reception...
Geography" webpage (accessed 30 November 2006) Mangerud, J.; Jakobsson, M.; Alexanderson, H.; Astakhov, V.; Clarke, G. K. C.; Henriksen, M.; Hjort, C.; Krinner...
Bachelor (1965), V14 #1 More Mathematical People (D.J. Albers, J.L. Alexanderson and C. Reid), p. 105 (1990). Harcourt, Brace, Jovanovich. "Johnson honors...
University of Waterloo. 27 November 2006. Retrieved 14 April 2008. Alexanderson, Gerald L. (January 1988). "Award for Distinguished Service to Professor...
Victorian age. Johns Hopkins University Press. p. 160. ISBN 0-8018-8011-4. Alexanderson, Gerald L. (2000). The random walks of George Pólya. Cambridge: Cambridge...
8. Albers, Donald J. (2008). "Donald Knuth". In Albers, Donald J.; Alexanderson, Gerald L. (eds.). Mathematical People: Profiles and Interviews (2 ed...
Encyclopædia Britannica 2016. Dinesen 1984, p. 419. Updike 1986, p. 2. Alexanderson 2008, p. 234. Jensen, #3 2010. Brantly 2013, p. 30. Brantly 2013, p. 44...
radio transmitter technology invented by Georg von Arco similar to the Alexanderson alternator. It generated radio frequency current at 8 kHz using a rotating...
Springer-Verlag. p. 426. ISBN 978-3-642-80866-1. D. Albers and G.L. Alexanderson, Mathematical People, Birkhauser, Boston, 1995. ISBN 0-8176-3191-7 "Professor...
control was made by Ernst F. W. Alexanderson, a Swedish immigrant to the U.S. working at General Electric (GE). Alexanderson had worked on the problem of...
machine is due to Charles Proteus Steinmetz, Caryl D. Haskins, Ernst Alexanderson, John T. H. Dempster, Henry Geisenhoner, Adam Stein, Jr., and F. P. Mansbendel...
Larson, co-founder of Volvo Niklas Zennström, co-founder of Skype Ernst Alexanderson, inventor Joe Armstrong, creator of the programming language Erlang Kurt...
transmitters were significantly inferior to the then state-of-the-art Alexanderson alternator and one of the arc transmitters was replaced by a more modern...
IIHF. Archived from the original on 4 June 2011. Retrieved 4 May 2011. Alexanderson, Thomas (23 September 2008). "Jacob gjorde drömmålet" [Jacob scored the...
(b. 1887) May 9 – Philip Dorn, Dutch actor (b. 1901) May 14 – Ernst Alexanderson, Swedish-born American television pioneer (b. 1878) May 18 Leroy Anderson...
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