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As stereo sound, RGB picture and widescreen signal is the best possible combination for digital television viewing, it is vital to use a SCART lead between any set-top box and the main television.
The composite videopicture with stereo sound is the best combination for a VHS video recorder. If your set-top box has two SCART sockets, it is likely that the one marked TV will carry RGB picture information and the other will not.
If your television has more than one SCART input, you may need to choose a special one (marked RGB) if you want to use RGB from the SCART cable.
On most set-top boxes it is possible to turn the RGB output on and off. This can be used to test the RGB input function on the television ? the picturequality appears blurred when it is disabled.
If have a DVD player, rather than a VHS recorder, you can attach this to the set-top boxes second SCART connector. The signal from the set-top box will normally be overridden by the DVD player when it is on, usually in high-quality RGB.
Some very cheap SCART cables do not have all the pins connected. They may not provide RGB and widescreen picture signals. SCART cables are normally no more than three metres in length.
The UHF lead is a lead that you would traditionally associate with television signals. They can carry:
You can't avoid these cables if you are going to use Freeview, as these cables are the only ones that you can use to distribute Freeview signals around the house.
Where you have an integrated digital television (an idTV) you just need to get the signal from the aerial to the television with one of these cables.
If you are using a Freeview set-top box, you will need to get the signal from the aerial to the set-top box using this aerial lead, but for best results connect the TV to the box with a SCARTcable.
You can also use a UHF lead to connect a set-top box to a television somewhere in the house. Your set-top box will require a RF (radio frequency) modulator. Note that "RF passthough" is another way of saying there is no modulator. You will be able to "tune" the second television into the picture showing on the set-top box.
Some boxes (all Sky boxes) have the ability to connect a remote control receiver to the second TV end of the interconnecting cable, so you can change channels.
The set-top boxes, whilst providing a reasonable qualitypicture to the second TV, will always provide only mono sound via a UHF lead.
The step-change in picturequality obtained by switching to RGB on a SCART is far greater than any obtained though spending any more on a gold-plated SCART cable.
Satellite or cable TV cable
These cables are usually very stiff, and have a very basic screw connector on the end. Usually they will provide an unbroken link to the satellitedish. At the dish end they plug into the device on the end of the arm, the LNB.
Don't try to disconnect these cables when the set-top box is on. Usually there is a small voltage that will cause dangerous sparks.
If the cable connects to a satellitedish, there is not much you can do with the cable. Each receiver in the set-top box needs it's own wire to the LNB. With a personal video recorder (such as Sky+), or a multi-room installations there are two cables to the four-output LNB on the dish. If you want more rooms, each will require it's own cable.
If the cable is providing cable TV, then it is possible to use inexpensive "Y connectors" to link the incoming signal to various set-top boxes, cable modems, or - via an adaptor - directly to the back of a TV.
Composite video cable
This is the most simple and basic video connection you can get. It carries:
The picture will be in colour, and of comparable quality to a analogue broadcast station. However, there is no sound. For that reason this cable is often found joined to a stereo audio cable.
These signals are quite robust and can be carried for many metres. Often modern television sets have a single yellow photo input on their front input panel.
You also use an identical cable to carry digital stereo (SPDIF) sound.
Stereo audio cable
These cables carry the left and right channels of sound on two joined cables. They are usually required when a SCARTcable is not being used, as the SCART cable already carries stereo sound.
If you are connecting your set-top box to an external stereo system, a separate stereo audio is used.
There is no real practicable limit to the length of these cables, but excessive length will degrade the quality of the signal.
The S-videostandard is not well supported by most UK digital TV boxes, and very few have a S-video socket. If you need one for a particular analogue camcorder, use it, but avoid S-video with digital television. If you are using what appears to be a monochrome picture from a SCART lead, it will certainly by an incomplete S-Video signal and you should change to the RGB input.
This is the cable you will use to connect a computer to a old style monitor, and some modern LCD screen too. Most modern LCD TVs will have a VGA input too.
If you want to connect a set-top box to a LCD monitor, you can buy a conversion box from around 60. However this will not result in a better picture than using an existing SCART socket if there is one.
The only way to get higher than normal television resolution is to use a VGA in conjunction with a personal computer or modern games console.
If you want to get the very best out of a television or monitor use a digitalvideo interconnect (DVI) cable.
This will be the only way for most televisions and monitors to receive high-definition pictures from a computer, and some set-top boxes.
If you can use either a VGA cable or a DVI cable, choose the DVI option.
If you want to get the very best out of a television use a HDMI cable.
This will be the only way for most televisions to receive high-definition pictures from set-top boxes.