Radio QSL cards were basically radio postcards — proof that you and someone else chatted over the airwaves. You’d mail them after a successful radio convo, like, “Yup, I heard you loud and clear.”
The name comes from the Q code “QSL”:
“QSL?” = Did you get my signal?
“QSL” = I got your signal.
They were typically hand-drawn and people would collect them like…
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