Sync is 1100 to 1300 Hz Hertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). ![]() Color is achieved by sending the brightness of each color component (usually red, green and blue) separately. ![]() In other words, the signal frequency shifts up to create brighter pixels and shifts down to create darker pixels. SSTV uses analog frequency modulation, in which every different value of brightness in the image gets a different audio frequency. It is a much slower method of still picture transmission, usually taking from about eight seconds to a couple of minutes, depending on the mode used, to transmit one image frame. Analog broadcast television signals requires 6 to 8 MHz MegaHertz (MHz) 10^6 Hz of bandwidth, because it transmits 25 or 30 picture frames per second (in the NTSC, PAL or SECAM color systems), but SSTV usually only takes up a maximum of 3 kHz KiloHertz (kHz) 10^3 Hz of bandwidth. ![]() The most popular modes of SSTV are Robot, Scottie, and Martin.Ī technical term for SSTV is narrowband television. Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images.
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