{"id":33189,"date":"2018-07-15T07:21:28","date_gmt":"2018-07-15T11:21:28","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=33189"},"modified":"2018-07-15T07:21:28","modified_gmt":"2018-07-15T11:21:28","slug":"thai-cave-rescue-employed-ham-designed-87-khz-transceiver","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2018\/07\/thai-cave-rescue-employed-ham-designed-87-khz-transceiver\/","title":{"rendered":"Thai cave rescue employed ham-designed 87 kHz transceiver"},"content":{"rendered":"

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

(Source: Hackaday<\/a> via bernieS)<\/p>\n

Unless you live in a cave, you\u2019ve probably heard a little about the thirteen people \u2014 mostly children \u2014 trapped in the\u00a0Tham Luang Nang Non<\/em>\u00a0cave in Thailand. What you may have missed, though, is the hacker\/ham radio connection. The British Cave Rescue Council (BCRC) was asked for their expert help. [Rick Stanton], [John Volanthen] and [Rob Harper] answered the call. They were equipped with\u00a0HeyPhones<\/a>. The HeyPhone is a 17-year-old design from [John Hey, G3TDZ]. Sadly, [G3TDZ] is now a silent key (ham radio parlance for deceased) so he didn\u2019t get to see his design play a role in this high-profile rescue, although it has apparently been a part of many others in the past.<\/p>\n

The HeyPhone is actually considered obsolete but is still in service with some teams. The radio uses USB (upper sideband, not universal serial bus) at 87 kHz. The low frequency can penetrate deep into the ground using either induction loop antennas like the older Molephone, or \u2014 more commonly \u2014 with electrodes injecting RF energy directly into the ground.<\/p>\n

You can find a very detailed\u00a0article about the radio<\/a>\u00a0from 2001 if you want more details. The system is somewhat dated, but apparently works well and that\u2019s what counts.[…]<\/p><\/blockquote>\n

Click here to read the full article at Hackaday.<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

(Source: Hackaday via bernieS) Unless you live in a cave, you\u2019ve probably heard a little about the thirteen people \u2014 mostly children \u2014 trapped in the\u00a0Tham Luang Nang Non\u00a0cave in Thailand. What you may have missed, though, is the hacker\/ham radio connection. The British Cave Rescue Council (BCRC) was asked for their expert help. [Rick […]<\/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":[545,3],"tags":[7155,3354,4102,7156,3486],"class_list":["post-33189","post","type-post","status-publish","format-standard","hentry","category-ham-radio","category-news","tag-bernies","tag-hackaday","tag-ham-radio","tag-heyphone","tag-vlf"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-8Dj","jetpack-related-posts":[{"id":40023,"url":"https:\/\/swling.com\/blog\/2019\/10\/al-williams-hackaday-article-about-moon-bounce\/","url_meta":{"origin":33189,"position":0},"title":"Al Williams’ Hackaday article about Moon Bounce","author":"Thomas","date":"October 4, 2019","format":false,"excerpt":"(Source: Southgate ARC) Al Williams WD5GNR\u00a0writes on Hackaday about bouncing amateur radio signals off the moon One of the great things about ham radio is that isn\u2019t just one hobby. Some people like to chit chat, some like to work foreign countries, some prepare for emergencies, and there are several\u2026","rel":"","context":"In "Ham Radio"","block_context":{"text":"Ham Radio","link":"https:\/\/swling.com\/blog\/category\/ham-radio\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/10\/77_lro_full-moon-NASA.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/10\/77_lro_full-moon-NASA.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/10\/77_lro_full-moon-NASA.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2019\/10\/77_lro_full-moon-NASA.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":11217,"url":"https:\/\/swling.com\/blog\/2014\/10\/portablesdr-the-holy-grail-of-portable-sdr-transceivers\/","url_meta":{"origin":33189,"position":1},"title":"PortableSDR: The Holy Grail of portable SDR transceivers?","author":"Thomas","date":"October 28, 2014","format":false,"excerpt":"Many thanks to my buddy, Bennett Kobb (AK4AV), who shares information about the\u00a0PortableSDR, one of five finalists in The Hackaday Prize. PortableSDR creator,\u00a0Michael R Colton, describes his project on Hackaday: \"The PSDR is a completely stand-alone (no computer needed), compact, Portable Software Defined Transceiver (hence the name, sorta). Originally designed\u2026","rel":"","context":"In "New Products"","block_context":{"text":"New Products","link":"https:\/\/swling.com\/blog\/category\/new-products\/"},"img":{"alt_text":"PortableSDR","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/10\/PortableSDR-1024x465.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/10\/PortableSDR-1024x465.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/10\/PortableSDR-1024x465.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":62933,"url":"https:\/\/swling.com\/blog\/2025\/05\/meteor-burst-communications\/","url_meta":{"origin":33189,"position":2},"title":"Meteor Burst Communications","author":"Thomas","date":"May 13, 2025","format":false,"excerpt":"Many thanks to SWLing Post contributor, Dennis Dura, for sharing the following article from Hackaday: Radio Apocalypse: Meteor Burst Communications This piece explores Meteor Burst Communications (MBC)\u2014a method of bouncing radio signals off ionized meteor trails to enable long-distance communication without relying on satellites or infrastructure. Used historically in military\u2026","rel":"","context":"In "Ham Radio"","block_context":{"text":"Ham Radio","link":"https:\/\/swling.com\/blog\/category\/ham-radio\/"},"img":{"alt_text":"Perseids meteor shower Photo: NASA","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/05\/perseids_meteor_shower.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":55959,"url":"https:\/\/swling.com\/blog\/2023\/02\/radio-waves-the-dlarc-nasa-citizen-science-popshopradio-drm-to-europe-and-afghan-radio-closures\/","url_meta":{"origin":33189,"position":3},"title":"Radio Waves: The DLARC, NASA Citizen Science, PopShopRadio DRM to Europe, Hackers Disrupt Russian Radio, and Afghan Radio Closures","author":"Thomas","date":"February 25, 2023","format":false,"excerpt":"Radio Waves:\u00a0 Stories Making Waves in the World of Radio Welcome to the\u00a0SWLing Post\u2019s Radio Waves, a collection of links to interesting stories making waves in the world of radio.\u00a0Enjoy! Many thanks to SWLing Post contributors Trevor Robbins and Dennis Dura for the following tips: Digital Library Of Amateur Radio\u2026","rel":"","context":"In "AM"","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/10\/Shortwave-Radio-Astronomy-PARI.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/10\/Shortwave-Radio-Astronomy-PARI.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/10\/Shortwave-Radio-Astronomy-PARI.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/10\/Shortwave-Radio-Astronomy-PARI.jpg?resize=700%2C400&ssl=1 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