{"id":57583,"date":"2023-08-23T18:53:26","date_gmt":"2023-08-23T22:53:26","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=57583"},"modified":"2023-08-21T18:54:51","modified_gmt":"2023-08-21T22:54:51","slug":"can-you-help-bob-identify-this-mystery-signal","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2023\/08\/can-you-help-bob-identify-this-mystery-signal\/","title":{"rendered":"Can you help Bob identify this mystery signal?"},"content":{"rendered":"<p><strong><a href=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-2.jpeg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-57585\" src=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-2.jpeg\" alt=\"\" width=\"1200\" height=\"456\" srcset=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-2.jpeg 1200w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-2-300x114.jpeg 300w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-2-1024x389.jpeg 1024w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-2-768x292.jpeg 768w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-2-624x237.jpeg 624w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a>Many thanks to <em>SWLing Post<\/em> contributor, Bob (K7ZB), who shares the following note and recording:\u00a0<\/strong><\/p>\n<p style=\"padding-left: 40px;\">Hi Thomas,<\/p>\n<p style=\"padding-left: 40px;\">I recently started using an SDRplay RSP1A with their new software release SDRconnect.<\/p>\n<p style=\"padding-left: 40px;\">Quite a nice piece of work and my first foray into SDR after 60 years of analog radio (K7ZB).<\/p>\n<p style=\"padding-left: 40px;\">Today I was listening to WWV on 10MHz and it was being interfered with a strange type of digital signal that pretty much covered the band.<\/p>\n<p><a href=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-1.jpeg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-57586\" src=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-1.jpeg\" alt=\"\" width=\"1200\" height=\"454\" srcset=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-1.jpeg 1200w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-1-300x114.jpeg 300w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-1-1024x387.jpeg 1024w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-1-768x291.jpeg 768w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Screenshot-of-Myster-Signal-1-624x236.jpeg 624w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><\/p>\n<p style=\"padding-left: 40px;\">I finally tracked it down to 9.979MHz, recorded it and sent it to a friend who did a bit of audio analysis on it by expanding out the signal to look at individual bursts.<\/p>\n<div style=\"padding: 43.75% 0 0 0; position: relative;\"><iframe style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%;\" title=\"Mystery Signal on 10 MHz\" src=\"https:\/\/player.vimeo.com\/video\/856579481?h=594bc890a8&amp;badge=0&amp;autopause=0&amp;player_id=0&amp;app_id=58479\" frameborder=\"0\"><\/iframe><\/div>\n<p><script src=\"https:\/\/player.vimeo.com\/api\/player.js\"><\/script><\/p>\n<p style=\"padding-left: 40px;\">I certainly don&#8217;t recognize the modulation although it sounded like a form of CW in burst mode.<\/p>\n<p style=\"padding-left: 40px;\">I am just curious if you have any insight on this signal or where I might go to find out more about it.<\/p>\n<p style=\"padding-left: 40px;\">Thanks,<\/p>\n<p style=\"padding-left: 40px;\">Bob<br \/>\nK7ZB<br \/>\nGilbert, AZ<\/p>\n<p><strong><em>Post<\/em> readers: Can you identify this signal? If so, please comment and thank you in advance!<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Many thanks to SWLing Post contributor, Bob (K7ZB), who shares the following note and recording:\u00a0 Hi Thomas, I recently started using an SDRplay RSP1A with their new software release SDRconnect. Quite a nice piece of work and my first foray into SDR after 60 years of analog radio (K7ZB). Today I was listening to WWV [&hellip;]<\/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":[5448,34],"class_list":["post-57583","post","type-post","status-publish","format-standard","hentry","category-news","category-shortwave-radio","tag-mystery-signals","tag-shortwave"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-eYL","jetpack-related-posts":[{"id":64879,"url":"https:\/\/swling.com\/blog\/2025\/12\/cold-war-vlf-and-a-bobs-homemade-lwl-qsl-card\/","url_meta":{"origin":57583,"position":0},"title":"Cold War VLF and a Bob&#8217;s Homemade \u201cLWL\u201d QSL Card","author":"Thomas","date":"December 12, 2025","format":false,"excerpt":"Many thanks to SWLing Post contributor Bob (K7ZB), who writes: Hi Tom, Bob, K7ZB here, and I was just looking at a post on your SWL site for NSS, the US Navy station which was activated back in 1918. It brought to mind a very unique QSL card I made\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\/2025\/12\/Houf-MT1SSDV-USN-dress-jumper-copy.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Houf-MT1SSDV-USN-dress-jumper-copy.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Houf-MT1SSDV-USN-dress-jumper-copy.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Houf-MT1SSDV-USN-dress-jumper-copy.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":43808,"url":"https:\/\/swling.com\/blog\/2020\/06\/help-jim-identify-this-mystery-shortwave-time-signal-station\/","url_meta":{"origin":57583,"position":1},"title":"Help Jim identify this mystery shortwave &#8220;time signal&#8221; station","author":"Thomas","date":"June 10, 2020","format":false,"excerpt":"Many thanks to SWLing Post contributor, Jim Meirose, who recently logged a mystery signal and is asking for our help to identify it. Jim notes that it sounds much like a time signal and can be found on 4,806 kHz. Jim lives in the north east US and is receiving\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\/06\/blurry-dial.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/06\/blurry-dial.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/06\/blurry-dial.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/06\/blurry-dial.jpeg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":64980,"url":"https:\/\/swling.com\/blog\/2025\/12\/bobs-radio-corner-industrial-scientific-and-medical-ism-bands\/","url_meta":{"origin":57583,"position":2},"title":"Bob&#8217;s Radio Corner: Industrial, Scientific, and Medical (ISM) Bands","author":"Thomas","date":"December 21, 2025","format":false,"excerpt":"Industrial, Scientific, and Medical (ISM) Bands Noted by Bob Colegrove This is not the sort of thing you might consider typical DX.\u00a0 One reporter traced a signal like the one I describe here to the innocuous utility box at the corner of his lot.\u00a0 No, it is not noise.\u00a0 It\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\/2025\/12\/Fig-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Fig-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Fig-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Fig-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Fig-1.jpeg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Fig-1.jpeg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":50171,"url":"https:\/\/swling.com\/blog\/2021\/09\/help-carlos-id-this-mystery-digital-signal\/","url_meta":{"origin":57583,"position":3},"title":"Help Carlos ID this mystery digital signal","author":"Thomas","date":"September 8, 2021","format":false,"excerpt":"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\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\/2021\/09\/Carlos-Latuff-Mystery-Signal-Analog-Radio-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/09\/Carlos-Latuff-Mystery-Signal-Analog-Radio-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/09\/Carlos-Latuff-Mystery-Signal-Analog-Radio-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/09\/Carlos-Latuff-Mystery-Signal-Analog-Radio-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/09\/Carlos-Latuff-Mystery-Signal-Analog-Radio-1.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":49701,"url":"https:\/\/swling.com\/blog\/2021\/07\/five-beeps-can-you-identify-carlos-mystery-signal\/","url_meta":{"origin":57583,"position":4},"title":"Five Beeps: Can you identify Carlos&#8217; 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 &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\/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":42243,"url":"https:\/\/swling.com\/blog\/2020\/03\/dean-solves-second-interval-signal-mystery\/","url_meta":{"origin":57583,"position":5},"title":"Dean solves second interval signal mystery","author":"Thomas","date":"March 9, 2020","format":false,"excerpt":"In response to our second mystery interval signal challenge, SWLing Post contributor, Dean Bianco replies: Mystery solved! This is the \u201cinterval signal\u201d (more accurately, a placeholder with a musical station identifier) for the Compa\u00f1\u00eda Telef\u00f3nica Nacional de Espa\u00f1a (CTNW) from Madrid, Spain. They were a point-to-point HF radiotelephone terminal that\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\/03\/Compania-Telefonica-Nacional-de-Espana-642x1024.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/03\/Compania-Telefonica-Nacional-de-Espana-642x1024.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/03\/Compania-Telefonica-Nacional-de-Espana-642x1024.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/57583","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=57583"}],"version-history":[{"count":2,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/57583\/revisions"}],"predecessor-version":[{"id":57587,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/57583\/revisions\/57587"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=57583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=57583"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=57583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}