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-f...
Antenna used in this video 👉 https://www.arrowantennas.com/arrowii...
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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