{"id":5764,"date":"2013-02-27T07:05:11","date_gmt":"2013-02-27T11:05:11","guid":{"rendered":"http:\/\/swling.com\/blog\/?p=5764"},"modified":"2013-02-27T07:05:11","modified_gmt":"2013-02-27T11:05:11","slug":"how-to-decode-that-rdft-in-numbers-station-hm01-roland-explains","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2013\/02\/how-to-decode-that-rdft-in-numbers-station-hm01-roland-explains\/","title":{"rendered":"How to decode that RDFT in numbers station HM01? Roland explains"},"content":{"rendered":"

\"DIGTRX\"<\/a>A few weeks ago, I published a post with a recording of the Cuban numbers station HM01<\/a>, a “Hybrid Mode” numbers station which interchangeably broadcasts both voice and a digital mode called\u00a0RDFT<\/em> with each transmission. I had suggested using an application called “DIGTRX” to decode the data bursts.<\/p>\n

I then received \u00a0a comment on that post from the author of the DIGTRX program himself, Roland. He has actually created a page in English which describes in detail how to decode the RDFT in HM01. \u00a0Note that this page was originally in Roland’s native Portugese, and he kindly translates it into English for us:\u00a0http:\/\/www.qsl.net\/py4zbz\/eni.htm<\/a><\/p>\n

[While this means that we can decode the transmissions, it doesn’t mean we can necessarily decipher them, however.\u00a0 At least, not yet.]<\/p>\n

Imagine that a spy numbers station is using an application you, yourself, authored<\/em> to send coded messages. What are the odds?\u00a0 This apparently happened to Roland, when he discovered that HM01 was, in fact, using his application DIGTRX. What?!?<\/em><\/p>\n

Actually, it makes sense to me that numbers stations would use DIGTRX. After all, it’s open source. Operatives in the field can download the application without raising awareness. If it were a proprietary application, either commercially or of their own design, it would add to the complication of\u00a0downloading\u00a0and using it (on both ends). As you’ll read in Roland’s tutorial<\/a>, HM01 has built in robust redundancies by using RDFT and DIGTRX. Very interesting.<\/p>\n

Thanks, Roland, for sharing!<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

A few weeks ago, I published a post with a recording of the Cuban numbers station HM01, a “Hybrid Mode” numbers station which interchangeably broadcasts both voice and a digital mode called\u00a0RDFT with each transmission. I had suggested using an application called “DIGTRX” to decode the data bursts. I then received \u00a0a comment on that […]<\/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":[8,627,172,43],"tags":[1679,1734,1733,1736,1682,1683,1735],"class_list":["post-5764","post","type-post","status-publish","format-standard","hentry","category-articles","category-how-to","category-numbers-stations","category-shortwave-radio","tag-cuban-spy-numbers-station","tag-decoding-cuban-spy-numbers-station","tag-decoding-hm01","tag-decoding-rdft","tag-digtrx","tag-rdft","tag-roland"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-1uY","jetpack-related-posts":[{"id":5575,"url":"https:\/\/swling.com\/blog\/2013\/02\/shortwave-radio-recordings-listen-to-cuban-spy-numbers-station-hm01\/","url_meta":{"origin":5764,"position":0},"title":"Shortwave Radio Recordings: Listen to Cuban Spy Numbers Station HM01","author":"Thomas","date":"February 14, 2013","format":false,"excerpt":"Numbers stations have always been a dark oddity that pop up from time-to-time in the course of shortwave radio listening. There is unquestionably an air of mystery and intrigue which surrounds them.\u00a0With the release of the movie The Numbers Station, many non-SWLers may be enticed to explore the HF bands.\u2026","rel":"","context":"In "Broadcasters"","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"WFL_015","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/02\/CubanFlag-300x202.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":7413,"url":"https:\/\/swling.com\/blog\/2013\/09\/cuban-numbers-station-hm01-serving-up-a-little-confusion\/","url_meta":{"origin":5764,"position":1},"title":"Cuban Numbers Station HM01: serving up a little confusion","author":"Thomas","date":"September 27, 2013","format":false,"excerpt":"On occasion, I hear the Cuban numbers station HM01 on 5,855 kHz on weekday mornings. It seems that many of the mornings as I listen, I hear HM01 making mistakes or at least experiencing \"technical difficulties\" (click here for a recent case in point). Though I don't often record HM01,\u2026","rel":"","context":"In "Broadcasters"","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"WFL_015","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/02\/CubanFlag-300x202.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":8844,"url":"https:\/\/swling.com\/blog\/2014\/02\/miami-herald-cuban-spies-and-shortwave-numbers\/","url_meta":{"origin":5764,"position":2},"title":"Miami Herald: Cuban spies and shortwave numbers","author":"Thomas","date":"February 26, 2014","format":false,"excerpt":"I should note that we have several\u00a0recordings and frequencies for the numbers station HM01, which is mentioned in this article. Very happy to see that they interviewed Chris Smolinski: (Source: Miami Herald) Even if you\u2019re not a Cuban spy, you too can receive secret messages sent by Havana to its\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"towers","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2009\/11\/grimetonbandw-225x300.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":6342,"url":"https:\/\/swling.com\/blog\/2013\/04\/numbers-station-hm01-and-ana-montes\/","url_meta":{"origin":5764,"position":3},"title":"Numbers station HM01…and Ana Montes","author":"Thomas","date":"April 26, 2013","format":false,"excerpt":"Wednesday morning, I suppose I had number stations on the brain.\u00a0 It was no surprise, as I had just watched The Numbers Station the previous night.\u00a0 Nonetheless, I experienced a rather strange coincidence:\u00a0 I was reading an intriguing article about Ana Montes,\u00a0\u201cone of the most damaging spies in U.S. history,\u201d\u2026","rel":"","context":"In "Articles"","block_context":{"text":"Articles","link":"https:\/\/swling.com\/blog\/category\/articles\/"},"img":{"alt_text":"Downloads-001","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/04\/Downloads-001-300x175.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":6210,"url":"https:\/\/swling.com\/blog\/2013\/04\/north-korean-numbers-station-detected-possible-submarine-instructions\/","url_meta":{"origin":5764,"position":4},"title":"North Korean numbers station detected; possible submarine instructions?","author":"Thomas","date":"April 13, 2013","format":false,"excerpt":"The website Intellihub.com\u00a0features an Op Ed piece regarding a recently detected numbers station supposedly originating from North Korea. The station, reported by a ham radio operator, is in single-side band and\u00a0adjacent\u00a0to the Voice of Korea. Below is an excerpt from this Op Ed piece; note my comments following: (Source: Intellihub.com)\u2026","rel":"","context":"In "Broadcasters"","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"NorthKoreaMap","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2011\/12\/NorthKoreaMap.gif?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":57559,"url":"https:\/\/swling.com\/blog\/2023\/08\/cuban-numbers-station-hm01-goes-cuckoo-and-other-cuban-broadcast-shenanigans\/","url_meta":{"origin":5764,"position":5},"title":"Cuban Numbers Station HM01 Goes Cuckoo! And Other Cuban Broadcast “Shenanigans”…","author":"Thomas","date":"August 28, 2023","format":false,"excerpt":"Many thanks to SWLing Post contributor, Pete Madtone, who shares the following recording of Cuban Numbers Station HM01 and notes: Hi Thomas, I was reading HF Underground earlier and a post on it mentioned that HM01 had gone a bit mad \"10345 kHz is HM01 Cuban Lady with what sounds\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\/2023\/08\/Cuckoo-Clock-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Cuckoo-Clock-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Cuckoo-Clock-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Cuckoo-Clock-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/Cuckoo-Clock-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\/5764","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=5764"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/5764\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=5764"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=5764"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=5764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}