File:Clam Lake ELF.jpg

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Description
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)
Date Taken on 1 February 1982
Source ID:DNSC8203911
Author Service Depicted: Navy
Permission
(Reusing this file)
Public domain
This file is a work of a sailor or employee of the U.S. Navy, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain in the United States.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

Summary

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An aerial view of the Navy Extremely Low Frequency (ELF) Test Facility surrounded by trees   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Creator
InfoField
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994
Title
An aerial view of the Navy Extremely Low Frequency (ELF) Test Facility surrounded by trees
Description
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
Date 1 February 1982
date QS:P571,+1982-02-01T00:00:00Z/11
institution QS:P195,Q59661040
Source/Photographer
Permission
(Reusing this file)
Public domain
This image is a work of a U.S. military or Department of Defense 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 in the United States.

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current03:36, 8 July 2006Thumbnail for version as of 03:36, 8 July 20063,000 × 2,400 (2.65 MB)Dual Freq (talk | contribs){{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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