{"id":14324,"date":"2025-06-04T09:54:44","date_gmt":"2025-06-04T04:24:44","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=14324"},"modified":"2025-06-04T09:54:47","modified_gmt":"2025-06-04T04:24:47","slug":"thailand-station-2700-km-on-space-station","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/thailand-station-2700-km-on-space-station\/","title":{"rendered":"Thailand Station (2700 km) on Space Station"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/TZqua-SV4q8?si=DaWSDZyRQyJCDjVM\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">What you heard just now was the CQ calls of E21EJC, from Thailand, about 2700 km from here, on the downlink of International Space Station on 437.800 MHz, the downlink frequency of the crossband repeater. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You know that UHF like VHF is line of sight communication and it is impossible to hear a Thailand station from my region on UHF without the help of the cross band satellite repeater. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">International Space Station receives on 145.990 MHz and transmits the audio back on 437.800 MHz. You need to get the time of the satellite pass as can be seen on N2YO.COM here. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Doppler correction is needed and we can use <a href=\"http:\/\/mail.amsat.org.ar\/pass.htm#top\">Argentinian Amsat Satellite pass prediction page<\/a> for that. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">My Moxon Yagi was kept in a South East direction to pick up the signals from Space Station passing along the Eastern side today morning. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Anyone with a UHF radio or even an RTL-SDR dongle can pick up the signals as Space Station transmits at about 5W power. Though it is at an altitude of about 420 km, lack of obstacles in between gives us good signals on UHF, which is not possible on terrestrial communication.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What you heard just now was the CQ calls of E21EJC, from Thailand, about 2700 km from here, on the downlink of International Space Station on 437.800 MHz, the downlink frequency of the crossband repeater. You know that UHF like VHF is line of sight communication and it is impossible to hear a Thailand station [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":14326,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-14324","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Thailand Station (2700 km) on Space Station - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/thailand-station-2700-km-on-space-station\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Thailand Station (2700 km) on Space Station - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"What you heard just now was the CQ calls of E21EJC, from Thailand, about 2700 km from here, on the downlink of International Space Station on 437.800 MHz, the downlink frequency of the crossband repeater. 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