File:White Alice Site, Tropospheric Antennas HAER AK-21-A-2.jpg

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Summary

Description
English: Parabolic antenna used in the White Alice Communication System built around 1958 in Alaska by Western Electric and the US Air Force, which provided telephone communication between isolated communities. It was a tropospheric scatter system; large antennas like this beamed 50 kW signals at about 900 MHz at a low angle into the horizon, where they scattered off the tropopause, with a tiny fraction returning to Earth beyond the horizon. Looking East. The tower at right supports the feed horn for the antenna. The system became obsolete with the advent of communications satellites in the 1960s.
Date
Source

Historic American Engineering Record, Library of Congress, Call Number: HAER AK,20-CORD.V,2-A-2

This image is available from the United States Library of Congress's Prints and Photographs division
under the digital ID hhh.ak0215.
This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

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Author Rob Stapleton
Other versions File:White Alice Site, Tropospheric Antennas HAER AK-21-A-2.tif (TIFF file)

Licensing

Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

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inception

June 1987

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Date/TimeThumbnailDimensionsUserComment
current17:48, 3 March 2011Thumbnail for version as of 17:48, 3 March 20114,687 × 3,726 (1.47 MB)Martin H.full size, cropped
16:38, 21 February 2011Thumbnail for version as of 16:38, 21 February 20111,024 × 823 (105 KB)Centovalli{{Information |Description={{en|1=billboard antenna showing feeder horn on right, looking East}} |Source=*File:000933pu.tif |Date=2011-02-21 16:38 (UTC) |Author=*File:000933pu.tif: Rob Stapleton *derivative work: ~~~ |Permission= |other_versio
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