{"id":2642,"date":"2012-01-25T17:35:31","date_gmt":"2012-01-25T21:35:31","guid":{"rendered":"http:\/\/swling.com\/blog\/?p=2642"},"modified":"2012-01-27T07:23:24","modified_gmt":"2012-01-27T11:23:24","slug":"nsa-declassifies-receiver-dynamics-primer","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2012\/01\/nsa-declassifies-receiver-dynamics-primer\/","title":{"rendered":"NSA declassifies &#8220;Receiver Dynamics&#8221; primer"},"content":{"rendered":"<div id=\"attachment_2644\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"http:\/\/swling.com\/blog\/wp-content\/uploads\/2012\/01\/WJhf1000.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2644\" class=\"size-medium wp-image-2644\" title=\"WJhf1000\" src=\"http:\/\/swling.com\/blog\/wp-content\/uploads\/2012\/01\/WJhf1000-300x127.jpg\" alt=\"\" width=\"300\" height=\"127\" srcset=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2012\/01\/WJhf1000-300x127.jpg 300w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2012\/01\/WJhf1000-100x42.jpg 100w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2012\/01\/WJhf1000.jpg 474w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2644\" class=\"wp-caption-text\">The Watkins-Johnson HF-1000 (and NSA version, WJ-8711) are mentioned in this article<\/p><\/div>\n<p>On January 11, 2012 the <a title=\"The NSA\" href=\"http:\/\/www.nsa.gov\/\" target=\"_blank\">National Security Agency (NSA)<\/a> released a pre-1995 article entitled &#8220;Receiver Dynamics&#8221; from\u00a0its classified internal magazine, <em><a title=\"Cryptologic Quarterly\" href=\"http:\/\/www.nsa.gov\/public_info\/declass\/cryptologic_quarterly.shtml\" target=\"_blank\">Cryptologic Quarterly<\/a><\/em>. It contains an excellent, well-written explanation of the specifications of shortwave receivers used\u00a0by some of NSA&#8217;s K4 divisions.<\/p>\n<p><a title=\"Receiver Dynamics\" href=\"http:\/\/www.nsa.gov\/public_info\/_files\/cryptologic_quarterly\/Receiver_Dynamics.pdf\" target=\"_blank\">Download the article here (PDF)<\/a>.<\/p>\n<p><em>Thanks to Ed in the SWLfest list for the tip!<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>On January 11, 2012 the National Security Agency (NSA) released a pre-1995 article entitled &#8220;Receiver Dynamics&#8221; from\u00a0its classified internal magazine, Cryptologic Quarterly. It contains an excellent, well-written explanation of the specifications of shortwave receivers used\u00a0by some of NSA&#8217;s K4 divisions. Download the article here (PDF). Thanks to Ed in the SWLfest list for the tip!<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[8],"tags":[815,813,812,34,814,816],"class_list":["post-2642","post","type-post","status-publish","format-standard","hentry","category-articles","tag-hf-1000","tag-national-security-agency","tag-nsa","tag-shortwave","tag-watkins-johnson","tag-wj-8711"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-GC","jetpack-related-posts":[{"id":56251,"url":"https:\/\/swling.com\/blog\/2023\/04\/comparing-the-watkins-johnson-wj-8711-wj-8712-with-ten-tec-rx-340-rx-331-receivers\/","url_meta":{"origin":2642,"position":0},"title":"Comparing the Watkins-Johnson WJ-8711 &#038; WJ-8712 with TEN-TEC RX-340 &#038; RX-331 receivers","author":"Thomas","date":"April 8, 2023","format":false,"excerpt":"Many thanks to SWLing Post contributor, Paolo Viappiani, who shares the following guest post: The WJ-8711 & WJ-8712 vs. Ten-Tec RX-340 & RX-331 Receivers by Paolo Viappiani, Carrara, Italy In recent years, a renewed interest has grown in regards to the best HF receivers using \"first generation\" DSPs, typically the\u2026","rel":"","context":"In &quot;Guest Posts&quot;","block_context":{"text":"Guest Posts","link":"https:\/\/swling.com\/blog\/category\/guest-posts\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/04\/image6.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/04\/image6.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/04\/image6.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/04\/image6.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":54672,"url":"https:\/\/swling.com\/blog\/2022\/11\/video-dan-unboxes-a-new-in-box-watkins-johnson-wj-8711a\/","url_meta":{"origin":2642,"position":1},"title":"Video: Dan Unboxes a New-In-Box Watkins Johnson WJ 8711A","author":"Thomas","date":"November 16, 2022","format":false,"excerpt":"Many thanks to SWLing Post contributor, Dan Robinson, who shares the following video: https:\/\/youtu.be\/0qRYxi6qmEM Click here to view on YouTube. Dan, I'm not sure how you find these things, but wow! I know you had a lot of fun unboxing this NIB WJ 8711A! How amazing it is to turn\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/11\/Watkins-Johnson-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/11\/Watkins-Johnson-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/11\/Watkins-Johnson-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/11\/Watkins-Johnson-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/11\/Watkins-Johnson-1.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":59573,"url":"https:\/\/swling.com\/blog\/2024\/04\/replacement-power-supplies-for-wj-8711a-hf-1000a-series-receivers\/","url_meta":{"origin":2642,"position":2},"title":"Replacement power supplies for WJ-8711A\/HF-1000A series receivers","author":"Thomas","date":"April 30, 2024","format":false,"excerpt":"Many thanks to SWLing Post contributor, Dean Bianco, who writes: Inspired by Chuck Yarbrough 's YouTube video, I ordered one of the newly-manufactured replacement power supplies for the WJ-8711A\/HF-1000A series from WJ Systems, a new company run by noted WJ master technician Stephen Pappin. For those of us who own\u2026","rel":"","context":"In &quot;Accessories&quot;","block_context":{"text":"Accessories","link":"https:\/\/swling.com\/blog\/category\/accessories\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/04\/image6.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/04\/image6.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/04\/image6.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/04\/image6.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":54192,"url":"https:\/\/swling.com\/blog\/2022\/10\/nick-explores-the-skanti-r8001-and-compares-with-yaesu-ft-dx101mp-wj-8711\/","url_meta":{"origin":2642,"position":3},"title":"Nick explores the Skanti R8001 and compares with Yaesu FT-DX101MP &#038; WJ-8711","author":"Thomas","date":"October 3, 2022","format":false,"excerpt":"Many thanks to SWLing Post contributor,\u00a0Nick Booras, who writes: Hi Thomas I just picked up a new to me radio that [is] very rare in the US. I loved it so much I did a comparison to an 8711 and a FTDX101MP. The Skanti presented very well. Video https:\/\/youtu.be\/64Uyz3BtGBk Click\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/10\/Skanti2-1.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/10\/Skanti2-1.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/10\/Skanti2-1.png?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":44954,"url":"https:\/\/swling.com\/blog\/2020\/08\/nick-compares-the-icom-r9000-harris-590-wj-8711-and-racal-6790\/","url_meta":{"origin":2642,"position":4},"title":"Nick compares the Icom R9000, Harris 590, WJ 8711, and Racal 6790","author":"Thomas","date":"August 21, 2020","format":false,"excerpt":"Many thanks to SWLing Post contributor, Nick Booras, who shares the following video and notes: As a SW listener and radio collector I have enjoyed many hours perusing your blog and reviews. I recently started posting YouTube videos of some of my collection and thought you and your viewers might\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/08\/lab599-TX-500-Discovery-1-11.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/08\/lab599-TX-500-Discovery-1-11.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/08\/lab599-TX-500-Discovery-1-11.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/08\/lab599-TX-500-Discovery-1-11.jpeg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":26088,"url":"https:\/\/swling.com\/blog\/2017\/05\/buyer-beware-dan-shows-us-how-to-spot-a-scam-on-ebay\/","url_meta":{"origin":2642,"position":5},"title":"Buyer Beware: Dan shows us how to spot a scam on eBay","author":"Thomas","date":"May 28, 2017","format":false,"excerpt":"Many thanks to SWLing Post contributor, Dan Robinson, who writes: This is an example of a classic scam -- and these are usually seen involving Watkins-Johnson 8711\/A receivers. The seller puts a photo of what appears to be a good condition WJ up, with additional photos. But often these photos\u2026","rel":"","context":"In &quot;Guest Posts&quot;","block_context":{"text":"Guest Posts","link":"https:\/\/swling.com\/blog\/category\/guest-posts\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/05\/WatkinsJohnson-1024x312.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/05\/WatkinsJohnson-1024x312.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/05\/WatkinsJohnson-1024x312.jpg?resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/2642","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/comments?post=2642"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/2642\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=2642"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=2642"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=2642"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}