{"id":18216,"date":"2026-10-18T18:47:17","date_gmt":"2026-10-18T13:17:17","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=18216"},"modified":"2026-10-18T18:47:20","modified_gmt":"2026-10-18T13:17:20","slug":"oscar-1-to-oscar-128-legacy-of-amateur-radio-satellites","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/oscar-1-to-oscar-128-legacy-of-amateur-radio-satellites\/","title":{"rendered":"OSCAR 1 to OSCAR 128: Legacy of Amateur Radio Satellites!"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/Mpa-lSJDjtk?si=BPb_W1RGQR6CJ7yp\" 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\">The OSCAR (Orbiting Satellite Carrying Amateur Radio) program represents over six decades of incredible innovation, starting with a small group of enthusiasts and growing into a global movement of universities and amateur satellite organizations. From simple beacon transmitters to complex linear transponders and digital packet systems, the legacy from OSCAR 1 to OSCAR 128 showcases how amateur radio operators have consistently pushed the boundaries of space communication.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Key Milestones in the OSCAR Legacy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OSCAR 1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">December 12, 1961<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Built by Project OSCAR in California, it was the world&#8217;s first non-governmental satellite. It transmitted the word &#8220;HI&#8221; in Morse code for 22 days before re-entering the atmosphere.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">OSCAR 3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">March 9, 1965<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The first amateur satellite to feature a two-way voice transponder, allowing operators to communicate via SSB and CW through space for the first time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Australis-OSCAR 5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">January 23, 1970<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Built by students at the University of Melbourne in Australia, it was the first amateur satellite constructed outside the United States to receive an OSCAR designation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AMSAT-OSCAR 7 (AO-7)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">November 15, 1974<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One of the longest-lived amateur satellites. It experienced a battery failure in 1981 but miraculously &#8220;woke up&#8221; in 2002 when its shorted batteries opened, allowing its solar panels to power the transponder when in direct sunlight.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>HAMSAT (VO-52)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">India&#8217;s contribution to the amateur radio satellite community is highlighted by <strong>HAMSAT<\/strong> (also known as <strong>VU2SAT<\/strong> or <strong>VO-52<\/strong> \/ <strong>VUSat-OSCAR 52<\/strong>), India&#8217;s first dedicated amateur radio satellite.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Highlights of HAMSAT (VO-52)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Launch:<\/strong> Launched on May 5, 2005, by ISRO&#8217;s PSLV-C6 rocket from Satish Dhawan Space Centre, Sriharikota, alongside the primary payload CARTOSAT-1. It was placed into a polar Sun-synchronous orbit.<\/li>\n\n\n\n<li><strong>Design &amp; Payload:<\/strong> Weighing 42.5 kg, the micro-satellite carried two linear transponders for analog communications (supporting CW, SSB, and FM modes). One transponder was built indigenously by Indian radio amateurs, and the other was developed in collaboration with a Dutch amateur radio operator.<\/li>\n\n\n\n<li><strong>Orbit Configuration:<\/strong> It operated in <strong>Mode-B<\/strong> (UHF uplink on 435.250 MHz and VHF downlink on 145.900 MHz).<\/li>\n\n\n\n<li><strong>Legacy:<\/strong> Though designed for a nominal mission life of just one year, HAMSAT became exceptionally popular worldwide due to its robust receiver and clear signal performance, serving the global amateur radio community for over 9 years before being officially decommissioned by ISRO in July 2014 after suffering battery degradation.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>GreenCube<\/strong> (<strong>Italy-OSCAR 117<\/strong> or <strong>IO-117<\/strong>) is a phenomenal milestone in amateur satellite communications. Launched in July 2022 on the inaugural flight of Europe&#8217;s Vega-C rocket, it operated in a <strong>Medium Earth Orbit (MEO)<\/strong> at an altitude of approximately 5,800 to 6,000 km.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why GreenCube (IO-117) is Unique:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The MEO Advantage:<\/strong> Unlike typical Low Earth Orbit (LEO) satellites that race across the sky in 10 to 15 minutes, GreenCube\u2019s high MEO orbit gave it a massive footprint and long pass durations (up to over an hour of visibility). This allowed for intercontinental, long-haul DX contacts spanning thousands of kilometers across different continents (such as Europe to Asia or the Americas).<\/li>\n\n\n\n<li><strong>Digital Digipeater:<\/strong> It featured an advanced 1200-baud GMSK packet radio \/ digipeater payload operating on the 70cm UHF band. Operators used software configurations (like UZ7HO SoundModem \/ GreenTNC or GNU Radio paired with a directional antenna and transceiver) to relay digital packets through space.<\/li>\n\n\n\n<li><strong>The Science Mission:<\/strong> Primarily built as a 3U CubeSat by the Sapienza University of Rome, ENEA, and the University of Naples &#8220;Federico II&#8221; alongside AMSAT Italia, its core scientific payload was an autonomous closed-cycle hydroponic micro-garden designed to test cultivating brassica microgreens in space.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>QO-100<\/strong> (Qatar-OSCAR 100, hosted on the Es\u2019hail-2 commercial communications satellite) is the world\u2019s first and only amateur radio payload in geostationary orbit. Launched in November 2018, it revolutionized satellite communications by offering continuous, 24\/7 coverage over a massive footprint spanning from Brazil to Thailand (covering Europe, Africa, the Middle East, and parts of Asia).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Features<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Stationary Position:<\/strong> Unlike Low Earth Orbit (LEO) satellites that require complex tracking rotators and Doppler shift compensation, QO-100 is fixed relative to Earth. Operators can use a statically pointed satellite dish.<\/li>\n\n\n\n<li><strong>Narrowband Transponder (NB):<\/strong> A 250\u2013500 kHz linear transponder utilized for traditional modes like SSB, CW, FT8, and FreeDV.<\/li>\n\n\n\n<li><strong>Wideband Transponder (WB):<\/strong> An 8 MHz transponder dedicated to high-speed data and Digital Amateur Television (DATV) transmissions.<\/li>\n\n\n\n<li><strong>Frequencies:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Uplink (Earth-to-Space):<\/strong> ~2.4 GHz (13-cm band)<\/li>\n\n\n\n<li><strong>Downlink (Space-to-Earth):<\/strong> ~10.45 GHz (3-cm Ku-band)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because ground stations require an inexpensive offset satellite dish, a modified Ku-band LNB for reception, and a 2.4 GHz transmitter setup, QO-100 has become a staple for reliable, multi-mode international communication unaffected by terrestrial propagation or sunspot cycles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Canada-OSCAR 128<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">July 7, 2026<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The 128th satellite to receive the prestigious OSCAR designation. Built by the University of Victoria Centre for Aerospace Research, it marks the continued evolution of the program into the era of modern CubeSats.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The shift from custom-built chassis to standardized CubeSats has dramatically lowered the barrier to entry, allowing student groups and amateur organizations worldwide to continue the legacy that started in a California garage in 1961.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How did the AMSAT-OSCAR 7 (AO-7) satellite come back to life after being dead for 21 years?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AMSAT-OSCAR 7 (AO-7) came back to life because the internal short circuit that killed its batteries in 1981 eventually broke apart, allowing its solar panels to power the electronics directly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The story of its &#8220;resurrection&#8221; is a fascinating example of how extreme space environments can sometimes inadvertently fix hardware issues:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The &#8216;Death&#8217; (1981):<\/strong> After seven highly successful years in orbit, one or more of AO-7&#8217;s Nickel-Cadmium (NiCd) battery cells developed a dead short. Because the battery was connected directly to the main power bus, this short circuit acted like a massive drain, dragging the voltage from the solar panels down to near zero. The satellite was completely dead.<\/li>\n\n\n\n<li><strong>The Healing Process (1981\u20132002):<\/strong> For 21 years, the silent satellite tumbled through space. In orbit, satellites endure severe thermal cycling\u2014swinging from extreme heat in direct sunlight to deep freezing cold when passing through Earth&#8217;s shadow. This constant thermal expansion and contraction over two decades eventually caused the shorted battery connection to physically snap or disintegrate.<\/li>\n\n\n\n<li><strong>The Resurrection (2002):<\/strong> When the short circuit finally broke, it became an &#8220;open&#8221; circuit. Suddenly, the drain on the power bus was gone. The solar panels could once again deliver proper voltage directly to the satellite&#8217;s communication transponders.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Today, AO-7 operates in a &#8220;zombie&#8221; mode. Because its batteries are completely disconnected and cannot store charge, the satellite only functions when it is in direct sunlight. The moment its orbit takes it into an eclipse (Earth&#8217;s shadow), the power drops to zero and it instantly dies, only to boot back up when the sun hits its panels again.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The OSCAR (Orbiting Satellite Carrying Amateur Radio) program represents over six decades of incredible innovation, starting with a small group of enthusiasts and growing into a global movement of universities and amateur satellite organizations. From simple beacon transmitters to complex linear transponders and digital packet systems, the legacy from OSCAR 1 to OSCAR 128 showcases [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":18217,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-18216","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 v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>OSCAR 1 to OSCAR 128: Legacy of Amateur Radio Satellites! - 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\/oscar-1-to-oscar-128-legacy-of-amateur-radio-satellites\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"OSCAR 1 to OSCAR 128: Legacy of Amateur Radio Satellites! - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"The OSCAR (Orbiting Satellite Carrying Amateur Radio) program represents over six decades of incredible innovation, starting with a small group of enthusiasts and growing into a global movement of universities and amateur satellite organizations. 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