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Revise: The Art of SCART
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[h3]This is a topic describing how to connect up your Video devices using SCART[/h3] [blue][i]This is a long, long page. keep scolling down reading the portions with connection diagrams in sequence, because each builds on information in prior portions.[/i][/blue] [b]SCART[/b] The SCART interface was proposed (I believe) by the French electronics industry as a means of connecting the video and audio signals between domestic entertainment equipment. It was taken up and is used extensively in Europe (including the UK) but is not used in the USA which uses phono cables. Because the interface tries to cope with everything, the full cable contains some 21 wires and the 21-pin plug is somewhat big and clumsy. Often they are of poor construction and may fall out the socket in the equipment. In my opinion it is a grotty design, but we are stuck with it. Unlike an aerial cable (described below) a SCART cable carries only ONE TV program at a time, but it may 'travel' either way in the cable, depending on the settings of the devices at each end of the cable. For example if you have two Video Recorders A and B and you connect them together with a SCART cable, then if A is playing and B is recording the signal passes from A to B, but if B is playing and A is recording then the signal goes in the opposite direction. Simplifying the description: To achieve this effect for Composite Video and Audio signals in the plugs there are 8 pins dedicated to OUT signals and 8 pins dedicated to IN signals and the OUT pins at one end are connected by the wires to the IN pins at the other end of the cable, that's 8 wires. For RGB (Red Green Blue) signals each colour has a pair of pins at each end and a fourth pair carries a signal designating which end is sending and hence which is receiving. Composite Video is a kind of signal in which all the colours and grey-scale information is combined. The RGB video carries Red, Green And Blue colour information on separate wires, this gives better quality than Composite Video. Almost all video devices can handle Composite Video, but lower priced devices may not handle RGB. The pin connections are shown in the last portion of this page and also at [a]http://www.electronics2000.co.uk/data/pinout/scart.htm[/a] [b]Aerial Cable[/b] The aerial cable brings the wireless signals down from the aerial to the first piece of equipment and is then daisy-chained (see diagrams below) from one equipment to the next by using short aerial extension leads. The cable is only two wires and is Co-Axial, which means that it consists of a wire in the middle surrounded by plastic insulation and then the insulation in turn covered by the outer wire which is in the form of a mesh of very fine wires. Then the whole cable is covered with a further layer of plastic. An Aerial cable carries multiple TV channels as RF signals (=Radio Frequency) and consequently feeds into a part of each equipment called a Tuner, which is capable of separating one channel from all the others. The direction of the signal is from the aerial, through each relevant device, to the TV set. Some devices such as a VCR will add their own output to the aerial signal on an empty channel as it passes through. Precisely which channel to use is chosen when setting up your equipment, usually by twiddling a sunken screw on the back of the equipment. Of all possible output signals from a device RGB is the highest quality, then Composite Video and finally RF is the lowest quality. It is best to use the highest quality signal that your equipment can use. ======== A device with a tuner, can use as input either the RF aerial signal or the SCART input. Due to their complexity, the digital TV signals can usually only be decoded by a digital receiver, either Freeview Digital terrestrial for an ordinary aerial, or a satellite receiver for a dish aerial. There are very few other domestic equipments at this date (2006) capable of decoding the digital TV signals. Some (possibly most) digital receivers do NOT add their output signal to the RF aerial cable, so the digital TV channels are generally only received at other equipment via their SCART inputs. Hence after the digital receiver you can consider that the aerial cable carries only the old-fashioned 'analogue' TV channels. BBC1, BBC2, ITV, Channel4, Channel5, plus the output from a VCR or DVD recorder. The SCART cable, though it only carries one channel at a time, carries any channel from the digital receiver or from any VCR or DVD player in play mode. =========== In general if you carry the Aerial cable chain right through (see below) to the TV set, you can be watching an old-fashioned 'analogue' channel while recording a different channel from the SCART cable. ========== See also [a]http://en.wikipedia.org/wiki/SCART[/a] for more information on the SCART signals. Revised on 15 Aug 2006
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