File:Wire inverted L antenna construction.png
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Summary
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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.
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| 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
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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.
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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, 1930.
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 07:02, 13 June 2025 | 1,676 × 954 (129 KB) | JayCubby | posterize/sharpen to clean up background |
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