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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. A literal term for SSTV is narrowband television .
A frame taken from an animation of slow scan TV images taken on a flyaround inspection of the station by the shuttle. Pettit and Kimbrough used the station's Canadarm2 to move Leonardo from the Harmony module and placed in the shuttle's cargo bay at 21:52 UTC.
There are three ways to reduce the bandwidth of a video signal: reduce the scan rate, reduce the image size, and/or (with digital television) use heavier compression.When the scan rate is reduced, this is referred to as slow-scan TV or, in the most extreme cases when the scan rate is too slow to simulate motion, freeze frame television.
The experiment was successful and the international space station even broadcast the message back to earth. Many of the space station crew are also amateur radio operators. After their standard work day (based on UTC time), they might use their evening free time to communicate with family and other hams via amateur radio.
Low-definition television (LDTV) refers to TV systems that have a lower screen resolution than standard-definition television systems. The term is usually used in reference to digital television, in particular when broadcasting at the same (or similar) resolution as low-definition analog television systems.
A still from the original slow-scan television broadcast, which has since been lost to time, of the Apollo 11 moon landing. Lost television broadcasts are television programs that were not preserved after they were broadcast, rendering them permanently unavailable for both public and private viewing.
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Radiofacsimile, radiofax or HF fax is an analogue mode for transmitting grayscale images via high frequency (HF) radio waves. It was the predecessor to slow-scan television (SSTV). It was the primary method of sending photographs from remote sites (especially islands) from the 1930s to the early 1970s.