{"id":33127,"date":"2018-07-08T06:55:42","date_gmt":"2018-07-08T10:55:42","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=33127"},"modified":"2018-07-08T06:55:42","modified_gmt":"2018-07-08T10:55:42","slug":"us-army-training-film-circuit-testing-and-signal-generators-1951","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2018\/07\/us-army-training-film-circuit-testing-and-signal-generators-1951\/","title":{"rendered":"US Army Training Film: Circuit Testing and Signal Generators (1951)"},"content":{"rendered":"<p><a href=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2018\/07\/Signal-Generator.jpeg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-33128\" src=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2018\/07\/Signal-Generator.jpeg\" alt=\"\" width=\"593\" height=\"435\" srcset=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2018\/07\/Signal-Generator.jpeg 593w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2018\/07\/Signal-Generator-300x220.jpeg 300w\" sizes=\"auto, (max-width: 593px) 100vw, 593px\" \/><\/a><\/p>\n<p>Many thanks to <em>SWLing Post<\/em> contributor,\u00a0Jarno de Haan, who shares this\u00a0US Army Training Film about circuit testing via\u00a0<a href=\"https:\/\/youtu.be\/bHtsSqRg7SU\" target=\"_blank\" rel=\"noopener\">YouTube.<\/a>\u00a0If you own vintage radio gear, you should check this out:<\/p>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"625\" height=\"352\" src=\"https:\/\/www.youtube.com\/embed\/bHtsSqRg7SU?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en-US&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/youtu.be\/bHtsSqRg7SU\" target=\"_blank\" rel=\"noopener\">Click here to view on YouTube.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Many thanks to SWLing Post contributor,\u00a0Jarno de Haan, who shares this\u00a0US Army Training Film about circuit testing via\u00a0YouTube.\u00a0If you own vintage radio gear, you should check this out: Click here to view on YouTube.<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[545,3,43],"tags":[7145,4105,2950,7144],"class_list":["post-33127","post","type-post","status-publish","format-standard","hentry","category-ham-radio","category-news","category-shortwave-radio","tag-circuit-testing","tag-how-to","tag-signal-corps-bc-221-al-signal-generator","tag-signal-generators"],"jetpack_publicize_connections":[],"jetpack_shortlink":"https:\/\/wp.me\/pn3uc-8Cj","jetpack-related-posts":[{"id":4532,"url":"https:\/\/swling.com\/blog\/2012\/09\/the-mighty-kbc-testing-transatlantic-signal-on-9-4-mhz-october-7-2012\/","url_meta":{"origin":33127,"position":0},"title":"The Mighty KBC testing transatlantic signal on 9.4 MHz, October 7, 2012","author":"Thomas","date":"September 28, 2012","format":false,"excerpt":"See if you can catch this test transmission on Sunday, October 7 (oo:00-02:00UTC) from The Mighty KBC in the Netherlands: (Source: The Mighty KBC) The Mighty KBC is testing on 9400 kHz on Sunday, October 7th, 2012 between 00.00 - 02.00 UTC with 100kW beamed to the USA, South America\u2026","rel":"","context":"In &quot;Broadcasters&quot;","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2011\/09\/KBCradio-300x212.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":22236,"url":"https:\/\/swling.com\/blog\/2016\/11\/which-is-the-best-sony-icf-2001d2010-or-icf-sw77-part-two\/","url_meta":{"origin":33127,"position":1},"title":"Which is the best? Sony ICF-2001D\/2010 or ICF-SW77? Part two","author":"Clint Gouveia","date":"November 16, 2016","format":false,"excerpt":"Hi there, after the first set of recordings were analysed, the score was 4-3 to the ICF-2001D, demonstrating how similar these two great receivers are in overall performance. There were a copule of notable differences however. The synchronous detection circuit on the ICF-2001D allows the user to effectively tune through\u2026","rel":"","context":"In &quot;AM&quot;","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"sony-test","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/11\/sony-test.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/11\/sony-test.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/11\/sony-test.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/11\/sony-test.jpg?resize=700%2C400 2x"},"classes":[]},{"id":18134,"url":"https:\/\/swling.com\/blog\/2016\/04\/a-38-99-rtl-sdr-with-100-khz-1-7-ghz-coverage\/","url_meta":{"origin":33127,"position":2},"title":"A $38.99 RTL-SDR with 100 Khz &#8211; 1.7 GHz coverage","author":"Thomas","date":"April 7, 2016","format":false,"excerpt":"Many thanks to SWLing Post contributor, Bill, who recently shared a link to this very affordable RTL-SDR with wideband coverage. I am not at all familiar with this model, but I do like the enclosure and the fact it has both an HF and UV antenna jack. This must be\u2026","rel":"","context":"In &quot;New Products&quot;","block_context":{"text":"New Products","link":"https:\/\/swling.com\/blog\/category\/new-products\/"},"img":{"alt_text":"RTL-SDR","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/04\/RTL-SDR-e1460028209998.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/04\/RTL-SDR-e1460028209998.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/04\/RTL-SDR-e1460028209998.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":4593,"url":"https:\/\/swling.com\/blog\/2012\/10\/reminder-the-mighty-kbc-testing-transatlantic-signal-on-9-4-mhz-october-7-2012\/","url_meta":{"origin":33127,"position":3},"title":"Reminder: The Mighty KBC testing transatlantic signal on 9.4 MHz, October 7, 2012","author":"Thomas","date":"October 6, 2012","format":false,"excerpt":"See if you can catch this test transmission on Sunday, October 7 (oo:00-02:00UTC) from The Mighty KBC in the Netherlands: (Source: The Mighty KBC) The Mighty KBC is testing on 9400 kHz on Sunday, October 7th, 2012 between 00.00 - 02.00 UTC with 100kW beamed to the USA, South America\u2026","rel":"","context":"In &quot;Broadcasters&quot;","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2011\/09\/KBCradio-300x212.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":67464,"url":"https:\/\/swling.com\/blog\/2026\/10\/tinysa-spectrum-analyzer-and-signal-generator\/","url_meta":{"origin":33127,"position":4},"title":"tinySA Spectrum Analyzer and Signal Generator","author":"Robert Gulley","date":"October 25, 2026","format":false,"excerpt":"Reprinted with the kind permission of Ken Reitz, Editor The Spectrum Monitor\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 (Originally published in Volume 13, Number 8, August 2026). by Robert Gulley K4PKM The tinySA Ultra is an upgraded version of the tinySA which came out a number of years\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"tinySA Ultra Spectrum Analyzer","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2026\/10\/TinySA.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2026\/10\/TinySA.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2026\/10\/TinySA.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2026\/10\/TinySA.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2026\/10\/TinySA.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2026\/10\/TinySA.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":29102,"url":"https:\/\/swling.com\/blog\/2017\/11\/radio-caroline-testing-648-khz\/","url_meta":{"origin":33127,"position":5},"title":"Radio Caroline testing on 648 kHz","author":"Thomas","date":"November 12, 2017","format":false,"excerpt":"(Source: Southgate ARC via Mike Terry) Caroline 648 testing A test signal with continuous music and announcements reported today. Reception reports on Facebook from the UK, Holland, Belgium, France and Austria. Some reports from mainland Europe refer to a co-channel Romanian or Slovenian station. I think this is at a\u2026","rel":"","context":"In &quot;Broadcasters&quot;","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/11\/Radio-Dial-2-1024x576.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/11\/Radio-Dial-2-1024x576.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/11\/Radio-Dial-2-1024x576.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/33127","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=33127"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/33127\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=33127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=33127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=33127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}