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Wireless Signals

Wireless signals uses electromagnetic radiation, to
transmit signals e.g. Wi ­ Fi, Laptops, Sat Nav, Mobile
Phones, Remote Controls and IPods

The advantage of this technology is that they :

Are portable
Can be used anywhere
Available 24 / 7

Most communication is by microwaves and radio waves

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Communications can be affected

Diffraction ­ where the waves spread out resulting in signal loss

Refraction ­ Where different densities / layers in the
atmosphere cause changes in direction

Interference ­ Where radio stations transmitters transmit on
different frequencies

Distance ­ Each transmitter along the the route causes

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How satellites work

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