The International Space Station (ISS) recently conducted a week-long radio transmissions test by sending encoded signals in Slow Scan Television (SSTV) image transmission format to be decoded by anyone with the proper amateur radio equipment tuned at 145.8 MHz and an SSTV decoder app such as Robot 36.
SSTV images are sent and decoded line by line, much like how scanners and printers work.
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Night Sky in Focus | Astronomy and Amateur Radio © Anthony Urbano | Manila, Philippines
Night Sky in Focus 