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File:Project Diana antenna.jpg

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Project_Diana_antenna.jpg (299 × 440 pixels, file size: 118 KB, MIME type: image/jpeg)

Summary

Description
English: 111.5 MHz Reflective array antenna at Fort Monmouth, New Jersey, USA, used by the US Army Signal Corps, 1946, in Project Diana to bounce a radar signal off the Moon. It consists of 64 half-wave dipoles in an 8x8 array in front of a flat reflective screen, and had a gain of 24 dB and a main lobe beamwidth of about 15°. It was driven by a 50 kW modified SCR-271 radar set that produced quarter-second pulses. The echoes took about 2.5 seconds to return. The antenna could be rotated in azimuth only so the experiment could only be done at moonrise and moonset as the moon passed through the antenna's horizontal beam. It was the first demonstration that artificial radio signals could penetrate the ionosphere. From [1]
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Public domain
This file is a work of a U.S. Army soldier or employee, 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.

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  • 2006-09-02 11:58 Mwhite66 299×440×8 (120535 bytes) Project Diana antenna US Army Signal Corps, 1946 http://www.army.mil/cmh/books/30-17/S_9.htm {{PD-USGov-Military-Army}}

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Date/TimeThumbnailDimensionsUserComment
current22:43, 24 June 2008Thumbnail for version as of 22:43, 24 June 2008299 × 440 (118 KB)File Upload Bot (Magnus Manske) {{BotMoveToCommons|en.wikipedia}} {{Information |Description={{en|en:Project Diana antenna, US Army Signal Corps, 1946 http://www.army.mil/cmh/books/30-17/S_9.htm}} |Source=Transferred from [http://en.wikipedia.org en.wikipedia]; transfered to Commo

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