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During 1860s, James Maxwell, a Scottish physicist forecasted presence of radio waves.And in year 1886, Heinrich Hertz showcased projection of swift variation of the electric current into space in form of radio waves.In early 1990s, delicate and effective detector of the electromagnetic radiation was needed for developing the radio further. Satellite radio is also recent development in the field.One can listen to various international radio stations without any hassles.
The communication was just confined to two points then and was not public broadcasting as it is today.
But eventually due to persuasion by his American friends he had applied for patent in 1901. There has been tremendous growth of the radio over the years.
Transmitters earlier were known as spark gap machines.
Besides all these latest editions, Ham radio would be next big thing.
This technology is gearing up to hit the market soon.