One of the first <a href="https://en.wikipedia.org/wiki/microwave_radio_relay" class="extiw" title="en:microwave radio relay">microwave relay</a> systems in the US, a 5 GHz link built by AT&amp;T's manufacturing arm Western Electric in 1946 using military technology that provided telephone service 22 miles between Los Angeles and <a href="https://en.wikipedia.org/wiki/Santa_Catalina_Island_(California)" class="extiw" title="en:Santa Catalina Island (California)">Catalina island</a> off the coast of California. This is the Los Angeles end, two parabolic dishes one for transmitting and one for receiving. From "Bell Laboratories' Role in Victory" in <i>Bell Telephone magazine</i>, summer 1946, p. 123 <br><p><b>Identifier</b>: bellvol25telephonemag00amerrich (<a class="external text" href="https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&amp;profile=default&amp;fulltext=Search&amp;search=insource%3A%2Fbellvol25telephonemag00amerrich%2F">find matches</a>)<br><b>Title</b>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/internetarchivebookimages/tags/bookidbellvol25telephonemag00amerrich">Bell telephone magazine</a><br><b>Year</b>: 1946<br><b>Authors</b>:  <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/internetarchivebookimages/tags/bookauthorAmerican_Telephone_and_Telegraph_Company">American Telephone and Telegraph Company</a> <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/internetarchivebookimages/tags/bookauthorAmerican_Telephone_and_Telegraph_Company__Information_Dept">American Telephone and Telegraph Company. Information Dept</a><br><b>Subjects</b>:  <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/internetarchivebookimages/tags/booksubjectTelephone">Telephone</a><br><b>Publisher</b>:  <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/internetarchivebookimages/tags/bookpublisher_New_York__American_Telephone_and_Telegraph_Co___etc__">(New York, American Telephone and Telegraph Co., etc.)</a><br><b>Contributing Library</b>:  <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/internetarchivebookimages/tags/bookcontributorPrelinger_Library">Prelinger Library</a><br><b>Digitizing Sponsor</b>:  <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/internetarchivebookimages/tags/booksponsorInternet_Archive">Internet Archive</a><br><br><b>View Book Page</b>: <a rel="nofollow" class="external text" href="https://archive.org/stream/bellvol25telephonemag00amerrich/bellvol25telephonemag00amerrich#page/n150/mode/1up">Book Viewer</a><br><b>About This Book</b>: <a rel="nofollow" class="external text" href="https://archive.org/details/bellvol25telephonemag00amerrich">Catalog Entry</a><br><b>View All Images</b>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/internetarchivebookimages/tags/bookidbellvol25telephonemag00amerrich">All Images From Book</a><br>
Click here to <a rel="nofollow" class="external text" href="https://archive.org/stream/bellvol25telephonemag00amerrich/bellvol25telephonemag00amerrich#page/n150/mode/1up"><b>view book online</b></a> to see this illustration in context in a browseable online version of this book.<br><br><b>Text Appearing Before Image:</b><br><i>As a supplement to wire circuits in the communications zone, the Laboratories developed a micro-wave radio system operating at about 5000 megacycles.  At that frequency the waves behave like those of light, and a clear straight line path is required. A number of these systems were built by the Western Electric Co. and installed near the end of the war in South Germany and functioned well; one link was over 100 miles long, from Heidelberg to Zugspitze.  Usually however, links are about thirty miles long. Systems of this type are now in Bell System service, linking Nantucket and Catalina islands to the mainland</i>
<i>.SiAtS JH ijcruumy: a relay point o&gt;i a nncro-ivavc radio system. Several of these systemswere used by American forces .^ and proved very satisfactory 1946 Bell Laboratories Role in Victory 123 mf^r^ mx^K: __^ ^■SS^S</i><br><b>Text Appearing After Image:</b><br><i>On the Pacific coast: Mainland antennas of the new peacetime radio telephone installation to Catalina Island with an engineer from the Laboratories on hand to service them.</i><br><br><b>Note About Images</b><br></p>
<i>Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.</i>
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<ul><li>Source book page: <a rel="nofollow" class="external free" href="https://archive.org/stream/bellvol25telephonemag00amerrich/bellvol25telephonemag00amerrich#page/n150/mode/1up">https://archive.org/stream/bellvol25telephonemag00amerrich/bellvol25telephonemag00amerrich#page/n150/mode/1up</a></li></ul>