This is a “QSL” card which is typically used to confirm that a communication has taken place over Amateur Radio frequencies. I connected to the space station using my home PC (386SX I think), a device called a Terminal Node Controller (a sort-of modem), a Yaesu VHF radio running 45 watts, and an old modified fire department antenna on my roof. The protocol was AX.25 at 1200 baud.
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