Last October, I had the honor of making such contact with the ISS. I posted about this on my website here: <a href="https://rz01.org/na1ss/" rel="nofollow">https://rz01.org/na1ss/</a><p>The ISS has radios on board that allow amateur radio operators to send and receive APRS messages, talk to other hams via their built-in FM repeater or to receive SSTV images. They also have amateur TV stuff on board but I have not explored this yet. Crew members with an amateur radio license can pick up the mic of the radio that acts as a FM repeater to make contacts with other hams on the earth.<p>You can contact the ISS via a handheld setup (FM radio and a yagi antenna in your hand) or with a stationary setup like mine: <a href="https://rz01.org/leo-sat-ground-station-v3/" rel="nofollow">https://rz01.org/leo-sat-ground-station-v3/</a>
If you are interested in amateur radio in general, you might enjoy reading my "Declaration of Love to Amateur Radio": <a href="https://rz01.org/a-declaration-of-love-to-amateur-radio/" rel="nofollow">https://rz01.org/a-declaration-of-love-to-amateur-radio/</a>
My daughter is deaf and goes to a specialist deaf secondary school in the UK.<p>Five years ago ARISS-UK pre-arranged a connection between the school and astronaut Mark Vande Hei on one of the ISS flyovers. Various students got to ask questions directly to Mark in orbit. It was the first contact between ISS and a deaf school.<p><a href="https://www.arrl.org/news/ariss-confirms-october-12-as-date-for-contact-with-uk-school-for-deaf-children" rel="nofollow">https://www.arrl.org/news/ariss-confirms-october-12-as-date-...</a>
I have used the APRS on the ISS to talk with other amateur radio operators. I also spoke to an astronaut briefly from my backyard using a Kenwood D72A and an Elk antenna.
When I was studying to get my Technician-class ham radio license a few weeks ago I was slightly curious as to why there were questions relating to space stations and satellites, like "any ametaur with a radio license can contact the ISS" and such, but I paid those thoughts no mind as I was being hasty trying to legally fiddle with my APRS tracker in a weather balloon.<p>I should re-review those exam questions; I might be licensed to do a lot more than I know I can.
Or use lasers : <a href="https://www.youtube.com/watch?v=DCQ2CbfGs6g&t=440s" rel="nofollow">https://www.youtube.com/watch?v=DCQ2CbfGs6g&t=440s</a>
I wonder what kind of messages they'll receive on the ISS - "Excuse me sir, do you have a moment to talk about our Lord and Savior, Jesus Christ"?
Related discussion in 2018 <a href="https://news.ycombinator.com/item?id=16375474">https://news.ycombinator.com/item?id=16375474</a>