- Spot beam
A spot beam, in
telecommunicationsparlance, is a satellitesignal that is specially concentrated in power (i.e. send by a high-gain antenna) so that it will cover only a limited geographic area on earth. Spot beams are used so that only earth stations in a particular intended reception area can properly receive the satellite signal.
One notable example of the use of spot beams is on
direct broadcast satellitesystems such as DirecTVand DISH Networkthat deliver local broadcast televisionvia satellite only to viewers in the part of North Americafrom which those terrestrial broadcast stations originate.
Spot beams allow satellites to transmit different data signals using the same frequency. Because satellites have a limited-number of frequencies to use, the ability to re-use a frequency for different geographical locations (without different data interferring with each other at the receiver) allows for more simplified receiver designs.
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