Size of this preview: 800 × 455 pixels. Other resolutions: 320 × 182 pixels | 640 × 364 pixels | 1,024 × 583 pixels | 1,676 × 954 pixels.
Original file (1,676 × 954 pixels, file size: 129 KB, MIME type: image/png)
This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help.
Commons is a freely licensed media file repository. You can help.
Any autoconfirmed user can overwrite this file from the same source. Please ensure that overwrites comply with the guideline.
Summary
| Description |
English: Diagram of a homemade Inverted-L wire antenna, from a US Commerce Dept. pamphlet showing how to build a crystal radio. The inverted L is used as a transmitting and receiving antenna on the longwave, medium wave and shortwave bands by short wave listeners and radio amateurs. It consists of a wire strung between two supports with insulators at the ends to insulate it from the supports, with a vertical wire attached at one end which drops down and connects to the transmitter or receiver. This example from 1922 also has a lightning grounding switch used to disconnect it from the receiver and attach it to a ground connection during lightning storms for safety.
Caption: AN INVERTED L ANTENNA ADJUSTED BETWEEN TWO BUILDINGS It will be seen that there is a pulley adjustment that permits lowering of the antenna; or the tightening of it if it sways in the wind. Labelled parts in drawing:
Français : Schéma d'une antenne à ondes courtes à fil en L inversé montrant des pièces. Le L inversé est utilisé comme une antenne émettrice et réceptrice sur les bandes ondes longues , ondes moyennes et ondes courtes par les auditeurs à ondes courtes et les radioamateurs. Il se compose d'un fil tendu entre deux supports avec des isolateurs aux extrémités pour l'isoler des supports, avec un fil vertical attaché à une extrémité qui tombe et se connecte à l'émetteur ou au récepteur. Cet exemple de 1922 a également un interrupteur de mise à la terre pour l'attacher à une connexion à la terre pendant les orages pour des raisons de sécurité. Légende: ANTENNE L INVERSÉE AJUSTÉE ENTRE DEUX BÂTIMENTS On verra qu'il y a un réglage de la poulie qui permet l'abaissement de l'antenne; ou le resserrement s'il se balance dans le vent.
|
| Date | |
| Source | From Bureau of Standards (24 April 1922), Circular no. 120: Construction and operation of a simple homemade radio receiving outfit, US Commerce Dept., Washington D.C., p.5, fig.1 on archive.org. Alterations to image: Erased parts list from white area and cropped bottom slightly using Gimp image editor. |
| Author | S. W. Stratton, director, Bureau of Standards |
Licensing
|
This image or file is a work of a United States Department of Commerce employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.
|
 |
|
|
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, 1931.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:02, 13 June 2025 | | 1,676 × 954 (129 KB) | JayCubby | posterize/sharpen to clean up background |
| 18:04, 29 September 2014 |  | 1,676 × 954 (180 KB) | Chetvorno | User created page with UploadWizard |
File usage
The following 3 pages use this file:
Global file usage
The following other wikis use this file:
- Usage on it.wikipedia.org
- Usage on ko.wikipedia.org
