The International Space Station has a crossband FM repeater onboard that amateur radio operators can use. The ISS passes overhead regularly, sometimes several times a day, so it’s possible to get lots of attempts to work others via the fastest repeater ever built!
International Space Station Ham Radio Crossband Repeater Frequencies:
Downlink 437.800MHz FM; Doppler +-10KHz
Uplink 145.990MHz FM with 67.0 Hz PL
More info https://amsat-uk.org/2020/09/02/iss-fm-repeater-activated/
Antenna used in this video https://www.arrowantennas.com/arrowii/146-437.html
Track the ISS https://www.n2yo.com/?s=25544
Chapters
0:00 Using an Arrow Antenna
2:28 Adjusting for Doppler
4:05 Tracking the ISS
4:54 Power and Antenna
5:42 Acquisition of Signal
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