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Basic Radio by Ian Poole

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10

Personal communications

Cellular telephones have brought about a revolution in personal telecommunications over the past few years. Their introduction has enabled people to be contacted almost anywhere. Previously it was necessary to be within reach of a fixed telephone wired into the telephone network. A few mobile phones did exist, but they had limited range and were only available in a few cities. To be able to achieve the flexibility and coverage expected today a totally new system was needed. Systems have evolved in many countries in the world, and although there are differences between countries they use the same basic principles. For example, the system adopted in the UK for analogue systems is TACS (Total Access Communication System), ...

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