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. This activity is part of the program Amateur Radio on the International Space Station or ARISS.
SSTV images are sent and decoded line by line, much like how scanners and printers work. To watch a video showing an SSTV image being decoded as the ISS passes above the Philippines on June 25, 2021, 2:30 am, click here.
Amateur Radio on the International Space Station (ARISS)
PSAT2 SSTV Images
Night Sky in Focus | Astronomy and Amateur Radio © Anthony Urbano | Manila, Philippines