{"id":11818,"date":"2024-11-14T20:59:10","date_gmt":"2024-11-14T15:29:10","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=11818"},"modified":"2024-11-14T21:06:54","modified_gmt":"2024-11-14T15:36:54","slug":"what-is-ssdv","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/what-is-ssdv\/","title":{"rendered":"What is SSDV? No, it is not a typo!"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/5sGNwf8bGz4?si=11spYpEyOxJ1IEke\" 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\">This week, every amateur radio satellite enthusiast is busy decoding and posting SSTV (Slow Scan TV) images from International Space Station. Now what is SSDV? SSDV is the abbreviation for Slow Scan Digital TV, in contrast to SSTV which is analog and has been there for a long time. It has been mentioned that SSDV is a packetised digital form of SSTV. I heard of SSDV first when I read about the recently launched <a href=\"https:\/\/db.satnogs.org\/satellite\/REOO-2119-3738-4964-1579\" data-type=\"link\" data-id=\"https:\/\/db.satnogs.org\/satellite\/REOO-2119-3738-4964-1579\">ASRTU-1<\/a> amateur radio satellite, which has a UHF SSDV in addition to the V\/U transponder and 10GHz high resolution image downlink onboard. <a href=\"https:\/\/amsat-uk.org\/2017\/05\/05\/ubseds24-2nd-attempt\/\" data-type=\"link\" data-id=\"https:\/\/amsat-uk.org\/2017\/05\/05\/ubseds24-2nd-attempt\/\">UBSEDS24 Balloon<\/a> with SSDV launched from Bristol, UK sometime back had recorded nice SSDV images of the clouds from above.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lunar-OSCAR-94 which went into lunar orbit had transmitted SSDV images back to radio amateurs on Earth. WSJT JT4G was used for messages and transmissions were on 435.400 and 436.400 MHz. Transmitting power was about 2W, using VHF\/UHF SDR transceivers. It was the world&#8217;s smallest spacecraft to enter lunar orbit independently and radio amateurs had tracked its progress as it travelled towards the Moon and successfully entered lunar orbit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">JY1Sat was another satellite capable of downlinking images in SSDV format. This image format was developed by MI0VIM, for use in High Altitude Balloons. The satellite was named in honour of King Hussein of Jordan who was a radio amateur with callsign JY1 (SK). JY1Sat had an inverting linear transponder working in U\/V mode as well. According to <a href=\"https:\/\/destevez.net\/2019\/04\/decoding-ssdv-from-jy1sat\/\" data-type=\"link\" data-id=\"https:\/\/destevez.net\/2019\/04\/decoding-ssdv-from-jy1sat\/\">EA4GPZ<\/a>, SSDV images from JY1Sat can also be decoded using gr-satellites, an open source program. Detailed instructions are available on the webpage, which I could not grasp much due to unfamiliarity with the program! He has also posted a partial image decoded from the audio recorded by K4KDR. Alternate option is to decode with FUNcube dashboard software, which is a closed-source program. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This week, every amateur radio satellite enthusiast is busy decoding and posting SSTV (Slow Scan TV) images from International Space Station. Now what is SSDV? SSDV is the abbreviation for Slow Scan Digital TV, in contrast to SSTV which is analog and has been there for a long time. It has been mentioned that SSDV [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11828,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-11818","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>What is SSDV? No, it is not a typo! - 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\/what-is-ssdv\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is SSDV? 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