Television amateur
See also: ATV
The television amateur ( amateur television or ATV) indicates emissions of Télévision produced and diffused by people who do not make them Profession of it.
One should not confuse television amateur with the Slow fox trot-scan television (SSTV) which is a technique of transmission of images of resolutions and reduced qualities, line by line, by using traditional material Radioamateur (vocal).
Description
In Europe, the Télévision of amateur uses mainly the system STAKE for the coding of the emissions, and a little the SECAM in France. NTSC as for him is used with the the United States. In the facts, the standard employed corresponds to the standard of local commercial television. That makes it possible to use the traditional television sets of the trade to receive the emissions.The quality of the transmitted images can be comparable with that of commercial television, with the quality of the camera used near. The images are colors, the sound is mainly monophonic.
The emission in television requires large band-widths; it is thus practiced only on frequencies raised on the tape of the 430 MHz and beyond that. The standard is in general that of commercial television Hertzienne; on the higher frequencies, the standard is that used in satellite television.
TNT has not been currently used as an amateur (2006), on the other hand digital television as diffused by the commercial satellites is used into terrestrial on an experimental basis for a few years.
The emissions amateur cannot be encrypted and their contents must be limited to what is authorized in the country concerned (technical in general). Being given the frequencies used, the connections are limited to the optical range, just like commercial television. However, the powers being much lower, some Watts only - sometimes 100 Watts - the ranges are limited. Networks of relay were thus installed a little everywhere in France, most important is currently located in the South of France and allows to convey images of Nice to Perpignan.
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