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Broadcasting means transmission in all directions by electromagnetic waves from the transmitting station. Broadcasting that deals mostly with entertainment and advertising is probably the most familiar use of television. Millions of television sets in use around the world attest to its extreme popularity.
Most programmes produced live in the studio are recorded on video tape at a convenient time to be shown later. Initially television transmission was confined to the VHF band only but later a large number of channel allocations were made in the UHF band also. The distance of transmission, as explained earlier, is confined to line of the sight between the transmitting and receiving antennas.
The useful service range is up to 120 km for VHF stations and about 60 km for UHF stations. Television broadcasting initially started with monochrome picture but around 1952 colour transmission was introduced.
Despite its complexity and higher cost, colour television has become such a commercial success that it is fast superseding the monochrome system.
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