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why do we need cell phone towers

Reception, or signal strength, is crucial to the operation of cellular phones. Cell phone reception would be extremely poor or nonexistent without cell phone towers. A cell phone tower, also referred to as a cell site, is a tower or long vertical pole on which electronic communications equipment and antenna are mounted. Cell towers typically include transmitters, receivers, control electronics and additional electronic power sources for backup. The purpose of a cell phone tower is to facilitate cellular phone and other wireless communication device signal reception in a cellular network. A cellular network is a radio signal network that covers areas of lands referred to as cells.

Each cell in the network is serviced by one or more transceivers, or cell towers, in a fixed location. The cell tower transceiver is an electronic device that contains a combined transceiver and receiver. The transceiver/receiver controls transmission of signals between cellular devices and the base station controller. The base station controller is the system that transmits signals between cellular devices and the network switching subsystem.
Consider being at a major sporting event, like a football game. You can carry on a conversation with the person next to you just fine, and you can hear the announcer on the loud speaker, but you can t carry on a conversation with someone on the opposite side of the stadium.

Cell phones talking to the tower is a relatively low power signal. This is great because it means that a cell phone two towns over isn t going to interfere with your phone trying to do its thing. For most uses of Satellites that you deal with you re just listening to one-way communication, like picking up the GPS signal. Your device doesn t send anything to the satellite; it just listens to the single, loud, broadcast signal.

Same with broadcast television. Sometimes we do need to have two-way communication with a satellite. For that we use antennas that are higher power (compare a satellite dish to a cell phone) and that are highly directionalвthey send out a strong signal in only one direction. For example, the antenna on Voyager II must be pointed the right direction to within about 1/3 of a degree, while the antennas used to talk to it are as large as 70 meters in diameter. TV satellites can handle a less accurate pointing from a smaller antenna, but they re also much, much closer.

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