[{WikipediaArticle oldid='255554671'}]

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| The Wikimedia Commons logo, SVG version.| Original created by Reidab ( PNG version ) SVG version was created by Grunt and cleaned up by 3247 . Re-creation with SVG geometry features by Pumbaa , using a proper partial circle and SVG geometry features. (Former versions used to be slightly warped.)| Reidab , Grunt , 3247 , Pumbaa| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Commons-logo.svg
| Begriffsklärungs-Icon (Autor: Stephan Baum)| Eigenes Werk ( Originaltext: Own drawing by Stephan Baum ) Original Commons upload as File:Logo Begriffsklärung.png by Baumst on 2005-02-15| Stephan Baum| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Disambig-dark.svg
| Gedenktafel an Guglielmo Marconi in der Basilika Santa Croce in Florenz| Eigenes Werk| Jotge| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:GMSantaCroce.jpg
| Guglielmo Marconi , portrait, head and shoulders, facing left.| Dieses Bild  ist unter der digitalen ID cph.3a40043 in der Abteilung für Drucke und Fotografien der US-amerikanischen Library of Congress abrufbar. Diese Markierung zeigt nicht den Urheberrechtsstatus des zugehörigen Werks an. Es ist in jedem Falle zusätzlich eine normale Lizenzvorlage erforderlich. Siehe Commons:Lizenzen für weitere Informationen.| Pach Brothers| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Guglielmo Marconi.jpg
| Electrical engineer/inventor Guglielmo Marconi with the spark-gap transmitter (right) and coherer receiver (left) he used in some of his first long distance radiotelegraphy transmissions during the 1890s.| This image comes from the Google -hosted LIFE Photo Archive where it is available under the filename 4a204d82f07524bd . This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See the copyright section in the template documentation for more information.| Published on LIFE| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Guglielmo Marconi 1901 wireless signal.jpg
| Signature of Guglielmo Marconi.| Eigenes Werk von Connormah| Guglielmo Marconi| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Guglielmo Marconi Signature.svg
| A publicity photo of Italian radio pioneer Guglielmo Marconi posing in front of his early radio apparatus.  The device at left is the transmitter, consisting of a Righi spark gap dipole antenna (balls) which is powered by high voltage from an induction coil (not visible) .  When sparks jump between the central metal balls, radio frequency oscillating currents are excited in the metal rod antenna, radiating radio waves.  The device on the right is the receiver .  It uses a primitive radio wave detector called a coherer (in box) .  When a radio wave from the transmitter strikes the coherer it becomes conductive.  The coherer applies a pulse of DC current from a battery through a second circuit attached to the coherer to the mechanism at top, a telegraph sounder , creating a "click" sound.  Information can be transmitted by turning the transmitter on and off rapidly with a switch called a telegraph key , spelling out messages in Morse code .  The message can be translated from the series of clicks produced by the receiver.   This early transmitter radiated radio waves at UHF frequencies, and its range was limited to a few hundred feet. Creator/Photographer : Unidentified.| Portrait of Guglielmo Marconi (1874-1937), Engineer and Physicist| Unidentified photographer. Smithsonian Institution from United States| | Datei:Guglielmo Marconi posing.jpg
| £ 2.000 (Guglielmo Marconi)| Eigenes Werk| OneArmedMan| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Lire 2000 (Guglielmo Marconi).JPG
| Recreation of the first radio transmitter with a monopole antenna , built by Guglielmo Marconi in August 1895 during his development of radio communication.   It was a spark-gap transmitter which generated radio waves by an electric spark between two electrodes of a Righi spark gap (left, on table) .  The high voltage to produce the spark was generated by an induction coil (center) powered by a battery (on floor) .  A telegraph key (right, on table) in the primary circuit allowed the operator to switch the transmitter on and off rapidly, producing pulses of radio waves which spelled out text messages in Morse code .  The unique feature of this transmitter is that it includes Marconi's invention of a monopole antenna .  Marconi found that by connecting one side of the transmitter to an elevated copper sheet "capacity area" (top) and the other side to ground (earth), he could transmit longer distances than when using the previous dipole antennas invented by Hertz.    This crucial innovation reduced the frequency of the radio waves, and radiated vertically polarized waves which had a greater range.  With it Marconi achieved the first radio transmissions of practical distance, about 3 1/2 miles.| Retrieved January 28, 2016  from Guglielmo Marconi, "Looking back over thirty years of radio", Radio Broadcast magazine, Doubleday, Page, and Co., New York, Vol. 10, No. 1, November 1926,  p. 31 on http://www.americanradiohistory.com| Guglielmo Marconi| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Marconi's first radio transmitter.jpg
| Aktie der Marconi Wireless Telegraph Company of America vom 20. August 1913| Sammlung eines Mitglieds des Ersten Deutschen Historic-Actien-Clubs e.V. (EDHAC e.V.); (le)| Unbekannte Autoren und Grafiker; Scan vom EDHAC e.V.| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Marconi Wireless Telegraph 1913 x.jpg
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