File:Clam Lake ELF.jpg
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![File:Clam Lake ELF.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Clam_Lake_ELF.jpg/750px-Clam_Lake_ELF.jpg?20060708033600)
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原始文件 (3,000 × 2,400像素,文件大小:2.65 MB,MIME类型:image/jpeg)
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描述Clam Lake ELF.jpg |
English: An aerial view of the U.S. Navy's Clam Lake Extremely Low Frequency (ELF) radio transmitter facility. This transmitted ELF radio signals at a frequency of 76 Hz to communicate with submerged nuclear submarines around the world. The transmitter powered two perpendicular "ground dipole" antennas each consisting of a 14 mile transmission line grounded at each end. Sections of the transmission lines can be seen passing through the forest at lower left. The transmission lines were driven with a current of about 300 amps, which flowed deep in the ground between the ends of the lines, in a huge loop. The input power to the antennas was about 1 megawatt, and they radiated about 2 watts of ELF radiation. The Clam Lake facility became operational in 1985 and was shut down in 2004. This photo was taken in 1982 before it became operational, when it was known as the Wisconsin Test Facility. Location: Clam Lake, Wisconsin (WI) UNITED STATES OF AMERICA (USA) |
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日期 | 摄于1982年2月1日 | |||||||
来源 | ID:DNSC8203911 | |||||||
作者 | Service Depicted: Navy | |||||||
授权 (二次使用本文件) |
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摘要
[编辑]An aerial view of the Navy Extremely Low Frequency (ELF) Test Facility surrounded by trees
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Creator InfoField | Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994 | |||||||||||||||||||
标题 |
An aerial view of the Navy Extremely Low Frequency (ELF) Test Facility surrounded by trees |
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描述 |
The original finding aid described this photograph as: Base: Clam Lake State: Wisconsin (WI) Country: United States Of America (USA) Scene Camera Operator: Unknown Release Status: Released to Public |
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日期 |
1982年2月1日 date QS:P571,+1982-02-01T00:00:00Z/11 |
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藏于 |
institution QS:P195,Q59661040 |
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来源/摄影师 |
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授权 (二次使用本文件) |
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Standardized rights statement InfoField |
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当前 | 2006年7月8日 (六) 03:36 | ![]() | 3,000 × 2,400(2.65 MB) | Dual Freq(留言 | 贡献) | {{Information |Source=[http://www.dodmedia.osd.mil/Assets/1982/Navy/DN-SC-82-03911.JPEG ID:DNSC8203911] |Author=Service Depicted: Navy |Description=An aerial view of the Navy Extremely Low Frequency (ELF) Test Facility surrounded by trees.</br>Locatio |
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图像标题 | An aerial view of the Navy Extremely Low Frequency (ELF) Test Facility surrounded by trees. |
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作者 | Unknown |
来源 | Film |
简短标题 | DN-SC-82-03911 |
数据生成日期时间 | 1982年2月1日 (星期一) |
展示的城市 | CLAM LAKE |
JPEG文件备注 | File written by Adobe Photoshop¨ 5.2 |
IIM版本 | 2 |
说明作者 | M. Seaman |
特殊使用说明 | RELEASED |
展示的省或州 | WI |
展示的国家 | USA |
类别 | N |
补充类别 | UNCLASS |
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版权状态 简体中文(已转写)
1 2 1982
根据来源网站,权限声明的状态 中文(已转写)
无版权-美国 中文(已转写)
An aerial view of the Navy Extremely Low Frequency (ELF) Test Facility surrounded by trees (英语)
登记号码 简体中文(已转写)
6349353
媒体类型 简体中文(已转写)
image/jpeg
数据大小 简体中文(已转写)
2,776,185 字节
2,400 像素
3,000 像素
分类:
隐藏分类:
- Photographs taken on 1982-02-01
- CC-PD-Mark
- PD US Navy
- Media contributed by the Digital Public Library of America
- Media contributed by the National Archives and Records Administration
- Media contributed by National Archives at College Park - Still Pictures
- PD US Military
- Artworks without Wikidata item
- US National Archives series: Combined Military Service Digital Photographic Files, 1982 - 2007