{"id":1826,"date":"2025-04-30T16:34:08","date_gmt":"2025-04-30T20:34:08","guid":{"rendered":"https:\/\/umarc.eecs.umich.edu\/?page_id=1826"},"modified":"2025-12-09T16:21:06","modified_gmt":"2025-12-09T21:21:06","slug":"paul-kenton-collection","status":"publish","type":"page","link":"https:\/\/umarc.eecs.umich.edu\/index.php\/paul-kenton-collection\/","title":{"rendered":"Paul Kenyon Collection"},"content":{"rendered":"\n<p>The R-390A\/URR is considered the finest HF Receiver ever built.&nbsp; This receiver was designed in the early 1950\u2019s and released in February, 1954.&nbsp; The R-390A can receive signals down to its -143db noise floor.<\/p>\n\n\n\n<p>Originally built by Collins Radio Company, the R-390A was designed by two teams.&nbsp; The mechanical team led by Fred Johnson and the electronics team led by Ernie Pappenfus.&nbsp; Besides Collins Radio, there were 13 other sub-contractors who built the R-390 until 1984.&nbsp;<\/p>\n\n\n\n<p>These receivers were used in all branches of the military, CIA and NSA for monitoring communications from behind the Iron Curtain during the Cold War years.&nbsp; This receiver was classified as \u201cTop Secret\u201d until the mid-1960\u2019s and remains in use today by the NSA.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/umarc.eecs.umich.edu\/wp-content\/uploads\/2025\/04\/r-390a.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"652\" height=\"489\" data-id=\"1831\" src=\"https:\/\/umarc.eecs.umich.edu\/wp-content\/uploads\/2025\/04\/r-390a.jpg\" alt=\"\" class=\"wp-image-1831\" srcset=\"https:\/\/umarc.eecs.umich.edu\/wp-content\/uploads\/2025\/04\/r-390a.jpg 652w, https:\/\/umarc.eecs.umich.edu\/wp-content\/uploads\/2025\/04\/r-390a-300x225.jpg 300w\" sizes=\"auto, (max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/umarc.eecs.umich.edu\/wp-content\/uploads\/2025\/04\/r390asn.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"340\" height=\"328\" data-id=\"1830\" src=\"https:\/\/umarc.eecs.umich.edu\/wp-content\/uploads\/2025\/04\/r390asn.jpg\" alt=\"\" class=\"wp-image-1830\" srcset=\"https:\/\/umarc.eecs.umich.edu\/wp-content\/uploads\/2025\/04\/r390asn.jpg 340w, https:\/\/umarc.eecs.umich.edu\/wp-content\/uploads\/2025\/04\/r390asn-300x289.jpg 300w\" sizes=\"auto, (max-width: 340px) 100vw, 340px\" \/><\/a><\/figure>\n<\/figure>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The R-390A\/URR is considered the finest HF Receiver ever built.&nbsp; This receiver was designed in the early 1950\u2019s and released in February, 1954.&nbsp; The R-390A can receive signals down to its -143db noise floor. Originally built by Collins Radio Company, the R-390A was designed by two teams.&nbsp; The mechanical team led by Fred Johnson and [&hellip;]<\/p>\n","protected":false},"author":9192203,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1826","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/pages\/1826","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/users\/9192203"}],"replies":[{"embeddable":true,"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/comments?post=1826"}],"version-history":[{"count":3,"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/pages\/1826\/revisions"}],"predecessor-version":[{"id":1915,"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/pages\/1826\/revisions\/1915"}],"wp:attachment":[{"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/media?parent=1826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}