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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 .
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.
It is also possible to send digital data to the ISS via laptop computers, similar to an email communication, using radio frequencies instead of telephone or cable connections [citation needed]. On November 12, 2000 the first amateur radio contacts were made from the International Space Station during Expedition 1.
Propagation is similar to the lowest UHF TV broadcast channels. Additionally, this band can be easily received by simply tuning any cable-ready analog television or cable-box to the cable TV channels below and connecting an outdoor TV antenna. Amateur TV signals are much weaker than broadcast TV, so a preamplifier is often used to improve ...
Ground track example from Heavens-Above.An observer in Sicily can see the International Space Station when it enters the circle at 9:26 p.m. The observer would see a bright object appear in the northwest, which would move across the sky to a point almost overhead, where it disappears from view, in the space of three minutes.
Watch live from Washington, DC, as Nasa's SpaceX Crew-5 discuss their recent trip to the International Space Station. Nasa astronauts Josh Cassada and Nicole Mann, JAXA astronaut Koichi Wakata ...
Slow-scan television, a picture transmission method Sun Siyam TV , a Maldivian television channel Submerged Shock Test Vehicle - weaponry test to discover Weapon-Induced (Near Miss) Shock, meaning shock motions (displacement) experienced by any part of weapon itself or its assembly, i.e. while testing of SLATACMS .
Apollo 7 slow-scan TV, transmitted by the RCA command module TV camera. NASA decided on initial specifications for TV on the Apollo command module (CM) in 1962. [2] [ Note 1] Both analog and digital transmission techniques were studied, but the early digital systems still used more bandwidth than an analog approach: 20 MHz for the digital system, compared to 500 kHz for the analog system. [2]