File:Antenne 160m om original.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file (1,880 × 738 pixels, file size: 430 KB, MIME type: image/jpeg)

Captions

Captions

A multiwire flattop antenna on a building in France

Summary

[edit]
Description
Français : Antenne radioamateur au-dessus d'un immeuble en France, en 1912. Ce type est appelé antenne L inversée , et est largement utilisé dans la bande radio ondes longues (basse fréquence) des 160 mètres (1,5 MHz à 2 MHz), l'antenne était le type le plus utilisé de la télégraphie sans fil au début du 20ème siècle. Il se compose d'un certain nombre de fils horizontaux parallèles comme des cordes à linges, suspendus par des supports isolés à chaque extrémité, avec des fils verticaux reliés à une extrémité (droite) tombant vers l'émetteur. Les fils verticaux sont l'élément rayonnant; tandis que les fils horizontaux servent de charge pour ajouter de la capacité à l'antenne, pour augmenter le courant dans l'élément vertical, et donc la puissance rayonnée.
English: A wire radiotelegraphy antenna suspended above an apartment house in France, in 1912. This type is called a flattop or inverted L antenna, and is widely used in the longwave (low frequency) radio band, which was the most widely used band during the wireless telegraphy era at the beginning of the 20th century. It consists of a number of parallel horizontal wires like a clothesline, suspended by insulated supports at each end, with vertical wires connected at one end (right) dropping down to the transmitter. The vertical wires are the radiating element; while the horizontal wires serve as a capacitive top-load, to add capacitance to the antenna, to increase the current in the vertical element, and thus the radiated power.
Date
Source

Original uncolorized version of Antenne 160m om.jpg

From Société de TSF française à Juvisy-sur-Orge.
Author

Original author unknown

Scanned by F1jmm
Other versions Colorized version: Antenne 160m om.jpg

Licensing

[edit]
Public domain
This image (or other media file) is in the public domain because its copyright has expired and its author is anonymous.
This applies to the European Union and those countries with a copyright term of 70 years after the work was made available to the public and the author never disclosed their identity.
Important: Always mention where the image comes from, as far as possible, and make sure the author never claimed authorship.
Note: In Germany and possibly other countries, certain anonymous works published before July 1, 1995 are copyrighted until 70 years after the death of the author. See Übergangsrecht. Please use this template only if the author never claimed authorship or their authorship never became public in any other way. If the work is anonymous or pseudonymous (e.g., published only under a corporate or organization's name), use this template for images published more than 70 years ago. For a work made available to the public in the United Kingdom, please use Template:PD-UK-unknown instead.
 		Flag of Europe
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: brightness and contrast adjusted. Modifications made by F1jmm.

This file is an original and may be obsolete for general use, but is kept for historical or archival use. As such, it should not be modified or deleted except to correct upload or technical errors. Any modified versions or replacements of this image should be uploaded with a different file name.
العربيَّة ∙ čeština ∙ Deutsch ∙ English ∙ español ∙ فارسی ∙ français ∙ magyar ∙ italiano ∙ 日本語 ∙ Lëtzebuergesch ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ português ∙ русский ∙ slovenščina ∙ svenska ∙ 简体中文 ∙ 繁體中文 ∙ 正體中文（臺灣） ∙ +/−

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current19:38, 11 October 2023Thumbnail for version as of 19:38, 11 October 20231,880 × 738 (430 KB)Chetvorno (talk | contribs)Uploaded a work by Original author unknown Scanned by F1jmm from Original uncolorized version of File:Antenne 160m om.jpg From Société de TSF française à Juvisy-sur-Orge. with UploadWizard

You cannot overwrite this file.

There are no pages that use this file.

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Antenne_160m_om_original.jpg&oldid=811069852"