File:Marconi UHF radio communication system at the Vatican 1933.jpg

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Marconi_UHF_radio_communication_system_at_the_Vatican_1933.jpg ‎(413 × 559 pixels, file size: 58 KB, MIME type: image/jpeg)

Captions

Captions

Antenna of Guglielmo Marconi's 600MHz radiotelephone link between the Vatican and Castel Gandolfo 1933

Summary

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Description
English: Antenna of Guglielmo Marconi's 600 MHz experimental 30 mile radiotelephone link between the Vatican and the Pope's summer home at Castel Gandolfo. This parabolic antenna composed of resonant dipoles was on the roof of the Vatican annex, and transmitted a narrow beam of radio waves 30 miles (48 kilometres) to a similar antenna connected to a receiver at Castel Gandolfo. This was one of the first long distance UHF radio communication systems.
Date
Source Retrieved 13 July 2016 from Guglielmo Marconi, "Radio on ultra short waves" in Short Wave Craft magazine, Popular Book Corp., New York, Vol.3, No.12, April 1933, p.711, fig.8 on https://www.worldradiohistory.com
Author Guglielmo Marconi
Permission
(Reusing this file)		 This magazine published in the US in 1933 would have the copyright renewed in 1961. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here [1]. Search of the Renewals for Periodicals for 1960, 1961 and 1962 show no renewal entries for Short Wave Craft. Therefore the work's copyright was not renewed and it is in the public domain.

Licensing

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Public domain
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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current17:42, 6 September 2024Thumbnail for version as of 17:42, 6 September 2024413 × 559 (58 KB)Chetvorno (talk | contribs)Uploaded a work by Guglielmo Marconi from Retrieved 13 July 2016 from [https://www.worldradiohistory.com/Archive-Short-Wave-Television/30s/SW-TV-1933-04.pdf Guglielmo Marconi, "Radio on ultra short waves" in ''Short Wave Craft'' magazine, Popular Book Corp., New York, Vol.3, No.12, April 1933, p.711, fig.8] on https://www.worldradiohistory.com with UploadWizard

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