Slow-scan television
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Slow-scan television (SSTV) is a picture transmission method, used mainly by amateur radio operators, to transmit and receive static pictures via radio in monochrome or color.
Astronaut Gordon Cooper, SSTV transmission from Faith 7
NASA slow-scan image from the Moon
Slow-scan test card
Encoded image in B/W 8 system.
Narrow-bandwidth television
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Narrow-bandwidth television (NBTV) is a type of television designed to fit into a channel narrower than the standard bandwidth used for official television standards.
Screenshot of a NBTV testcard on a 32-line system