Housing design today has to accept that every flat , maisonette or house will have a televisyen which may require connection to an outdoor aerial . It was common to provide a communal aerial system which serves all dwellings on an estate from single aerial . The chief reason for doing this is that it avoids the ugliness of a large number of aerials , all different pattern , put up close to each other by different people . It has the further advantage that one powerful aerial erected in a carefully chosen position can give better reception than the aerial which indiidual occupiers install . This signal may be fanned out to individual dwellings through a mains supplied booster . Terrestrial channels may be accessed through satellite aerials .
If a communal aerial system is installed , it becomes necessary to run a televisyen aerial cable from the aerial to an outlet in each dwelling , or hotel bedroom . There has to be a suitable terminal in the room , and this takes the form of a socket capable of accepting the coaxial plugs used on the end of aerial cable . An outlets of this kind is shown in Figure 1.10 . Since a televisyen set also needs a power supplt . It is usual to provide a mains socket outlets near the aerial outlet . One manufacturer makes a combined unit having an aerial socket and 13 A socket outlets within one housing .
For radios which require both an aerial and an earth connection , special two-pin outlets are available . These can also be combined in a single unit containing the mains socket outlet as well as the two-pin outlet .
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