{"id":42461,"date":"2020-03-23T06:42:09","date_gmt":"2020-03-23T10:42:09","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=42461"},"modified":"2020-03-23T06:54:46","modified_gmt":"2020-03-23T10:54:46","slug":"yet-another-mystery-utility-signal-to-solve","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2020\/03\/yet-another-mystery-utility-signal-to-solve\/","title":{"rendered":"Yet another mystery utility signal to solve–!"},"content":{"rendered":"

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

Back by popular demand!<\/h2>\n

On our quest to solve UNID utility signals, SWLing Post<\/em> contributor David Crawford, is asking for help again to ID yet another<\/a> interval signal. David writes:<\/p>\n

Here’s yet another memorable utili-tune from the deep archives here, again not my recording, origin uncertain.<\/p>\n

This one has a date, time and frequency on the filename [19670811-2347-15910-VM unID] and therefore would have been 1967. I heard this one myself occasionally also, which would have been sometime during the mid-to-late 1970s. It would have overlapped with the same time period during which CTNE was using the 14985 kHz tune previously provided<\/a>, so despite the broad similarity I would assume it wasn’t them. Unless of course they used different tunes for different circuits:<\/p><\/blockquote>\nhttps:\/\/swling.com\/blog\/wp-content\/uploads\/2020\/03\/19670811-2347-15910-VM-unID-1.mp3<\/a><\/audio>\n

Readers: Can you positively ID this interval signal? If so,\u00a0please comment<\/a>!<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Back by popular demand! On our quest to solve UNID utility signals, SWLing Post contributor David Crawford, is asking for help again to ID yet another interval signal. David writes: Here’s yet another memorable utili-tune from the deep archives here, again not my recording, origin uncertain. This one has a date, time and frequency on […]<\/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":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3,43],"tags":[8348,94,5448,1064,4082],"class_list":["post-42461","post","type-post","status-publish","format-standard","hentry","category-news","category-shortwave-radio","tag-david-crawford","tag-interval-signals","tag-mystery-signals","tag-radio-recordings","tag-shortwave-radio"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-b2R","jetpack-related-posts":[{"id":42227,"url":"https:\/\/swling.com\/blog\/2020\/03\/lets-solve-another-interval-signal-mystery\/","url_meta":{"origin":42461,"position":0},"title":"Let’s solve another interval signal mystery!","author":"Thomas","date":"March 8, 2020","format":false,"excerpt":"Last month, we published\u00a0a post\u00a0asking\u00a0SWLing Readers to help Brian (W9IND) identify an elusive interval signal. Turns out, the interval signal belonged to the Voice Mirror of the PTT Habana, Cuba station. This month, SWLing Post contributor, David Crawford is asking for help to ID another interval signal which likely belongs\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\/2020\/03\/Push-button-phone-cropped-e1583684071445.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/03\/Push-button-phone-cropped-e1583684071445.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/03\/Push-button-phone-cropped-e1583684071445.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/03\/Push-button-phone-cropped-e1583684071445.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":42154,"url":"https:\/\/swling.com\/blog\/2020\/02\/mystery-solved-readers-identify-curious-interval-signal\/","url_meta":{"origin":42461,"position":1},"title":"Mystery Solved: Readers identify curious interval signal","author":"Thomas","date":"February 24, 2020","format":false,"excerpt":"Yesterday, we published a post asking SWLing Readers to help Brian (W9IND) identify an elusive interval signal (click here to read that post). We received dozens of replies--thank you so much! Many readers immediately identified the tune as some sort of utility station placeholder for Point To Point communications. Turns\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\/2020\/02\/PTT-Habana-Cuba-VErification.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/02\/PTT-Habana-Cuba-VErification.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/02\/PTT-Habana-Cuba-VErification.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/02\/PTT-Habana-Cuba-VErification.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":42461,"position":2},"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 "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\/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":[]},{"id":42146,"url":"https:\/\/swling.com\/blog\/2020\/02\/help-brian-identify-this-1970s-era-interval-signal\/","url_meta":{"origin":42461,"position":3},"title":"Help Brian identify this 1970s era interval signal","author":"Thomas","date":"February 23, 2020","format":false,"excerpt":"[Mystery solved! Click here to read the update.] Many thanks to SWLing Post contributor, Brian (W9IND), who writes: I want to thank you for stirring a memory that I never thought I\u2019d relive \u2013 even though it still doesn\u2019t solve the mystery of what the heck I was listening to\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\/2015\/09\/SX-99-Dial-Nar.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/09\/SX-99-Dial-Nar.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/09\/SX-99-Dial-Nar.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/09\/SX-99-Dial-Nar.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":60019,"url":"https:\/\/swling.com\/blog\/2024\/06\/can-you-help-dan-identify-this-mystery-interval-signal\/","url_meta":{"origin":42461,"position":4},"title":"Can you help Dan identify this mystery interval signal?","author":"Thomas","date":"June 17, 2024","format":false,"excerpt":"Many thanks to Dan Greenall, one of our dedicated Shortwave Radio Audio Archive contributors, who writes: Hi Thomas I was going over a few of my old cassettes today and discovered what seems to be an interval signal, but I cannot seem to place it. Recording: Unfortunately, all I can\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"Photo by Sai Harish on Unsplash","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/06\/Casette-Tape-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/06\/Casette-Tape-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/06\/Casette-Tape-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/06\/Casette-Tape-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/06\/Casette-Tape-1.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":42467,"url":"https:\/\/swling.com\/blog\/2020\/03\/cprm-lisboa-another-mystery-signal-solved\/","url_meta":{"origin":42461,"position":5},"title":"CPRM Lisboa: Another mystery signal solved","author":"Thomas","date":"March 24, 2020","format":false,"excerpt":"In response to our latest mystery utility signal challenge, SWLing Post contributor, Dean Bianco replies: This is the musical marker for CPRM Lisboa, a radiotelephone terminal that provided overseas telephone and telegraph communications in the days prior to satellites. I remembered the non-broadcast HF frequencies being loaded to bursting with\u2026","rel":"","context":"In "DX"","block_context":{"text":"DX","link":"https:\/\/swling.com\/blog\/category\/dx\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/07\/Boat-Anchor-Dial-2-1024x678.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/07\/Boat-Anchor-Dial-2-1024x678.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/07\/Boat-Anchor-Dial-2-1024x678.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\/42461","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=42461"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/42461\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=42461"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=42461"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=42461"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}