File:Marconi's early transmitter 1894.png
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Marconis radio transmitter
Summary edit
| Description |
English: The first spark gap radio transmitter used by radio pioneer Guglielmo Marconi during his development of the first radiotelegraphy communication systems. Invented by Marconi's mentor Augusto Righi of Bologna, it was a form of Heinrich Hertz's transmitter using a spark gap made of four metal balls (the 'Righi oscillator') as a dipole resonator-antenna. It generated radio waves in the microwave band, around 1 GHz. These were unable to travel beyond the visual horizon and were limited to a transmission range of about a half mile, so it was unsuitable for long distance communication. In 1895 Marconi invented the vertical monopole antenna which reduced the frequency, increasing the range of his transmitters to hundreds of miles. |
| Date | |
| Source | Retrieved 15 September 2023 from Charles Grinnell Ashley, Charles Brian Hayward (1912) Wireless Telegraphy and Wireless Telephony: An understandable presentation of the science of wireless transmission of intelligence, American School of Correspondence, Chicago, IL, p. 28, fig. 12 on Google Books |
| Author | Charles Grinnell Ashley |
Licensing edit
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 12:04, 15 September 2023 | | 1,257 × 1,269 (13 KB) | Chetvorno (talk | contribs) | Uploaded a work by Charles Grinnell Ashley from Retrieved 15 September 2023 from [https://books.google.com/books?id=pK-EAAAAIAAJ&pg=PA28 Charles Grinnell Ashley, Charles Brian Hayward (1912) ''Wireless Telegraphy and Wireless Telephony: An understandable presentation of the science of wireless transmission of intelligence'', American School of Correspondence, Chicago, IL, p. 28, fig. 12] on Google Books with UploadWizard |
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