Sony Ericsson GR64 Manual Do Utilizador

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Noise can be caused by electronic devices and radio transmitters. 
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Path-loss occurs as the strength of the received signal steadily decreases in 
proportion to the distance from the transmitter. 
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Shadowing is a form of environmental attenuation of radio signals caused by hills, 
buildings, trees or even vehicles.  This can be a particular problem inside 
buildings, especially if the walls are thick and reinforced. 
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Multi-path fading is a sudden decrease or increase in the signal strength.  This is 
the result of interference caused when direct and reflected signals reach the 
antenna simultaneously.  Surfaces such as buildings, streets, vehicles, etc., can 
reflect signals.