Given the number of technoids into radio and linux, there ought to be some way to do it on a linux box. Otherwise there's MMSSTV for the PC, which is free and uses the sound card. I've thought of broadcasting art over SSTV though of course the audience of retired military RF engineers would probably think it was some new kind of jamming. There's also a bootleg unlicensed SSTV frequency where people mostly in Indonesia and the Philippines exchange horny photos, though I can't remember what it is.
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