{"id":50171,"date":"2021-09-08T06:26:09","date_gmt":"2021-09-08T10:26:09","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=50171"},"modified":"2021-09-08T06:26:41","modified_gmt":"2021-09-08T10:26:41","slug":"help-carlos-id-this-mystery-digital-signal","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2021\/09\/help-carlos-id-this-mystery-digital-signal\/","title":{"rendered":"Help Carlos ID this mystery digital signal"},"content":{"rendered":"

\"\"<\/a>Many thanks to SWLing Post<\/em> contributor, Carlos Latuff<\/a>, who shares the following:<\/p>\n

I bought a small analog radio and I’ve been listening with it.<\/strong><\/p>\n

\"\"<\/a><\/p>\n

On September 4, around 17h48 UTC, I heard a strange signal on the band of 13 kHz, since it’s not a digital dial, I don’t know precisely the frequency but maybe if your readers may listen to the signal they may tell what it is about.<\/strong><\/p>\nhttps:\/\/archive.org\/download\/recording_202109\/Recording.mp3<\/a><\/audio>\n

It almost sounds like the preamble to an SSTV message, but I’m not sure about that noise that’s in between. Readers, if you can help Carlos ID this signal, please comment<\/a>!<\/p>\n","protected":false},"excerpt":{"rendered":"

Many thanks to SWLing Post contributor, Carlos Latuff, who shares the following: I bought a small analog radio and I’ve been listening with it. On September 4, around 17h48 UTC, I heard a strange signal on the band of 13 kHz, since it’s not a digital dial, I don’t know precisely the frequency but maybe […]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"closed","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":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3,43],"tags":[8043,5448,34],"class_list":["post-50171","post","type-post","status-publish","format-standard","hentry","category-news","category-shortwave-radio","tag-carlos-latuff","tag-mystery-signals","tag-shortwave"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-d3d","jetpack-related-posts":[{"id":49701,"url":"https:\/\/swling.com\/blog\/2021\/07\/five-beeps-can-you-identify-carlos-mystery-signal\/","url_meta":{"origin":50171,"position":0},"title":"Five Beeps: Can you identify Carlos’ mystery signal?","author":"Thomas","date":"July 25, 2021","format":false,"excerpt":"Many thanks to SWLing Post contributor, Carlos Latuff, who writes from Brazil: [Please check out this] audio sample of a signal I heard today (July 20, 2021) around 07h17 UTC on (at least) 4 different frequencies, simultaneously: - 16166 kHz - 16716 kHz - 16747 kHz - 16839 kHz Always\u2026","rel":"","context":"In "News"","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\/2018\/01\/XHDATA-d-808-keypad-closeup-radio-dial-e1515698257533.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/01\/XHDATA-d-808-keypad-closeup-radio-dial-e1515698257533.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/01\/XHDATA-d-808-keypad-closeup-radio-dial-e1515698257533.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/01\/XHDATA-d-808-keypad-closeup-radio-dial-e1515698257533.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":45074,"url":"https:\/\/swling.com\/blog\/2020\/08\/carlos-seeks-help-identifying-a-signal\/","url_meta":{"origin":50171,"position":1},"title":"Carlos seeks help identifying a signal","author":"Thomas","date":"August 31, 2020","format":false,"excerpt":"Many thanks to SWLing Post contributor, Carlos Latuff, who writes: Hope this message will find you well. I just monitored in Porto Alegre, Brazil, this signal on 9460 kHz. Searching on Internet I found that it's the same frequency where the Russian MR-102 Baklan radar is operating. But it could\u2026","rel":"","context":"In "News"","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\/2016\/11\/Radio-Dial-2-e1480988790507.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-e1480988790507.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/11\/Radio-Dial-2-e1480988790507.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":57876,"url":"https:\/\/swling.com\/blog\/2023\/10\/carlos-logs-a-noaa-high-seas-report\/","url_meta":{"origin":50171,"position":2},"title":"Carlos logs a NOAA High Seas Report","author":"Thomas","date":"October 5, 2023","format":false,"excerpt":"Many thanks to\u00a0SWLing Post\u00a0contributor and noted political cartoonist,\u00a0Carlos Latuff, who shares\u00a0his radio log art of a recent NOAA forecast. Carlos writes: Recently I have been receiving NOAA's Pacific high seas forecast via 12579 kHz USB. According to the NOAA schedule these SITOR-B transmissions come from the USCG base in Guam\u2026","rel":"","context":"In "Art"","block_context":{"text":"Art","link":"https:\/\/swling.com\/blog\/category\/art-2\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/10\/Carlos-NAVTEX.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/10\/Carlos-NAVTEX.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/10\/Carlos-NAVTEX.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/10\/Carlos-NAVTEX.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/10\/Carlos-NAVTEX.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":64231,"url":"https:\/\/swling.com\/blog\/2025\/10\/carlos-uncovers-the-mystery-behind-a-strange-radiofax-from-the-japan-meteorological-agency\/","url_meta":{"origin":50171,"position":3},"title":"Carlos Uncovers the Mystery Behind a Strange Radiofax from the Japan Meteorological Agency","author":"Thomas","date":"October 12, 2025","format":false,"excerpt":"Many thanks to SWLing Post contributor Carlos Latuff, who writes: This is the image I received today, October 12th, at 7:10 UTC, in Rio de Janeiro, Brazil, from the Japan Meteorological Agency, via radiofax (13988 kHz). It was supposed to be a satellite image, showing Tropical Storm Nakri (which will\u2026","rel":"","context":"In "Digital Modes"","block_context":{"text":"Digital Modes","link":"https:\/\/swling.com\/blog\/category\/digital-modes\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/10\/Carlos-Unusual-Radiofax-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/10\/Carlos-Unusual-Radiofax-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/10\/Carlos-Unusual-Radiofax-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/10\/Carlos-Unusual-Radiofax-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/10\/Carlos-Unusual-Radiofax-1.jpeg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/10\/Carlos-Unusual-Radiofax-1.jpeg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":51081,"url":"https:\/\/swling.com\/blog\/2021\/12\/carlos-shortwave-art-and-recording-of-radio-oromiya\/","url_meta":{"origin":50171,"position":4},"title":"Carlos\u2019 Shortwave Art and Recording of Radio Oromiya","author":"Thomas","date":"December 7, 2021","format":false,"excerpt":"Many thanks to\u00a0SWLing Post contributor and noted political cartoonist, Carlos Latuff, who shares another example\u00a0of his radio log art, this time for Radio Oromiya. Carlos notes: Radio Oromiya, 6030 kHz, broadcasting in Oromo language from Adis Abeba, Ethiopia. Presenter accuses Western media of spreading fake news about the war in\u2026","rel":"","context":"In "Art"","block_context":{"text":"Art","link":"https:\/\/swling.com\/blog\/category\/art-2\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/12\/Carlos-Latuff-1-e1638876397789.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/12\/Carlos-Latuff-1-e1638876397789.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/12\/Carlos-Latuff-1-e1638876397789.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/12\/Carlos-Latuff-1-e1638876397789.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/12\/Carlos-Latuff-1-e1638876397789.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":55615,"url":"https:\/\/swling.com\/blog\/2023\/02\/carlos-shortwave-art-and-recording-of-vatican-radio-february-6-2023-turkey-syria-earthquake\/","url_meta":{"origin":50171,"position":5},"title":"Carlos\u2019 Shortwave Art and recording of Vatican Radio (February 6, 2023–Turkey\/Syria Earthquake)","author":"Thomas","date":"February 6, 2023","format":false,"excerpt":"Many thanks to\u00a0SWLing Post\u00a0contributor and noted political cartoonist,\u00a0Carlos Latuff, who shares\u00a0his radio log art of Radio Vatican. Carlos notes: Excerpt from today's Vatican Radio program, broadcast in Portuguese on shortwave, bringing a message from Pope Francis in solidarity with the thousands of victims of the earthquake that hit Turkey and\u2026","rel":"","context":"In "Art"","block_context":{"text":"Art","link":"https:\/\/swling.com\/blog\/category\/art-2\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/02\/Carlos-Latuff-EarthQuake-Turkey-Syria-Radio-Vatican-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/02\/Carlos-Latuff-EarthQuake-Turkey-Syria-Radio-Vatican-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/02\/Carlos-Latuff-EarthQuake-Turkey-Syria-Radio-Vatican-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/02\/Carlos-Latuff-EarthQuake-Turkey-Syria-Radio-Vatican-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/02\/Carlos-Latuff-EarthQuake-Turkey-Syria-Radio-Vatican-1.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/50171","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=50171"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/50171\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=50171"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=50171"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=50171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}