File:Amateur cage antenna 5HK 1922 colorized.png
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Amateur radio wire antenna 1922
Summary
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| Description |
English: A wire antenna at a amateur radio station in 1922 in Oklahoma City, Oklahoma, USA, built by Leroy Moffat, Jr, 5HK. It is a type called an "inverted-L" cage aerial, 105 ft long and 93 ft high. The conductor is made of a "cage" of six wires, 12 ft. in diameter, held apart with wooden spacers. The vertical part at the far end functions as the radiator, while the horizontal part functions as a capacitive "top-load", increasing the current in the antenna. The "cage" construction increases it's capacitance to ground, and decreases the resistance. There is a counterpoise under the antenna consisting of a fan-shaped network of wires suspended a foot above the ground in the back yard. It is driven by a 1 kW rotary spark-gap transmitter. Moffat has worked stations all over the US with this equipment.
This is a historical black and white (greyscale) photo colorized by a recent editor. Since the colors shown are only a guess by the editor at the original colors, this image should be regarded as ORIGINAL RESEARCH and should not be used in encyclopedia articles. The original greyscale photo is at Amateur cage antenna 5HK 1922.jpg. Français : Une antenne filaire dans une station de radioamateur en 1922 à Oklahoma City, Oklahoma, USA, construite par Leroy Moffat, Jr, 5HK. C'est une antenne cage "en L inversé", 105 pieds de long et 93 pieds de haut. Le conducteur est constitué d'une «cage» de six fils de 12 pieds de diamètre, maintenus à l'écart par des entretoises en bois. La partie verticale à l'extrémité distante fonctionne comme le radiateur, tandis que la partie horizontale fonctionne comme une "charge supérieure" capacitive, augmentant le courant dans l'antenne. La construction «cage» augmente sa capacité à la terre et diminue la résistance. Il y a un contrepoids sous l'antenne consistant en un réseau en éventail de fils suspendus à un pied au-dessus du sol dans la cour arrière. Il est entraîné par un émetteur rotatif à éclateur de 1 kW. Moffat a travaillé des stations partout aux États-Unis avec cet équipement. |
| Date | |
| Source | Retrieved January 28, 2014 from QST, American Radio Relay League, Inc., Hartford, Connecticut, Vol. 5, No. 10, May, 1922, p. 61 on Google Books |
| Author |
Original greyscale version: Leroy Moffat, Jr. Colorized version: F1jmm |
| Other versions | Amateur cage antenna 5HK 1922.jpg Original greyscale photo this image is based on |
Licensing
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:04, 10 October 2020 | | 491 × 599 (379 KB) | F1jmm (talk | contribs) | Uploaded own work with UploadWizard |
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