{"id":42243,"date":"2020-03-09T08:54:00","date_gmt":"2020-03-09T12:54:00","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=42243"},"modified":"2020-03-09T08:54:00","modified_gmt":"2020-03-09T12:54:00","slug":"dean-solves-second-interval-signal-mystery","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2020\/03\/dean-solves-second-interval-signal-mystery\/","title":{"rendered":"Dean solves second interval signal mystery"},"content":{"rendered":"
\"\"<\/a>

(Image source: Madrid.org)<\/p><\/div>\n

In response to our second mystery interval signal challenge<\/a>, SWLing Post<\/em> contributor, Dean Bianco replies:<\/p>\n

Mystery solved!<\/p>\n

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<\/strong>.<\/p>\n

They were a point-to-point HF radiotelephone terminal that provided overseas telephone and telegraph services in the days before satellites became common.<\/p>\n

As a young SWL, I would receive all manner of strange musical identifiers for these utility stations. Most of these HF telecommunication services had gone to satellite by the early 1980\u2019s. The HF bands were chock-a-block with signals, whether they be broadcast or utility services.<\/p>\n

Glad to help!<\/p><\/blockquote>\n

To verify his claim, Dean shares the following embedded audio file made by Willi Passmann in the mid 1970s (via the excellent UtilityRadio.com<\/a> website):<\/p>\nhttps:\/\/swling.com\/blog\/wp-content\/uploads\/2020\/03\/e-539-pozuelo-del-rey-radio-wp.mp3<\/a><\/audio>\n

Well done, Dean! Thank you once again for coming to the rescue!<\/p>\n

In case you didn’t know, dear readers, Dean Bianco is a force to be reckoned with in the shortwave radio world. \ud83d\ude42 This year, he won the 3rd Annual Fest Trivia Quiz at the 2020 Winter SWL Fest! An impressive accomplishment, indeed. Not only that, but Dean’s an incredibly nice guy, great friend, and always willing to help out those new to the hobby!<\/p>\n

Thank you, Dean!<\/p>\n","protected":false},"excerpt":{"rendered":"

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 provided overseas telephone and telegraph […]<\/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":[3,288,43],"tags":[8348,8351,94,5448,1064,4082],"class_list":["post-42243","post","type-post","status-publish","format-standard","hentry","category-news","category-radio-history","category-shortwave-radio","tag-david-crawford","tag-dean-bianco","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-aZl","jetpack-related-posts":[{"id":42154,"url":"https:\/\/swling.com\/blog\/2020\/02\/mystery-solved-readers-identify-curious-interval-signal\/","url_meta":{"origin":42243,"position":0},"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":42467,"url":"https:\/\/swling.com\/blog\/2020\/03\/cprm-lisboa-another-mystery-signal-solved\/","url_meta":{"origin":42243,"position":1},"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":[]},{"id":42227,"url":"https:\/\/swling.com\/blog\/2020\/03\/lets-solve-another-interval-signal-mystery\/","url_meta":{"origin":42243,"position":2},"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":42146,"url":"https:\/\/swling.com\/blog\/2020\/02\/help-brian-identify-this-1970s-era-interval-signal\/","url_meta":{"origin":42243,"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":42243,"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":221,"url":"https:\/\/swling.com\/blog\/2011\/07\/between-broadcasts-exploring-interval-signals\/","url_meta":{"origin":42243,"position":5},"title":"Between Broadcasts-Exploring Interval Signals","author":"Thomas","date":"July 7, 2011","format":false,"excerpt":"Lately, I've been listening to a plethora of shortwave broadcasts as I'm about to review several new radios. 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