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{{Refimprove|date=December 2008}}
[[File:97rcsonn2.jpg|thumb|right|250px|1:10 scale [[radio-controlled car]]<br/>([[Saab Sonett|Saab Sonett II]])]]
A '''radio-controlled model''' (or RC model) is a [[Physical model|model]] that is [[steering|steerable]] with the use of [[radio control]]. All types of model [[vehicle]]s have had RC systems installed in them, including [[radio-controlled car|car]]s, [[radio-controlled boat|boat]]s, [[radio-controlled airplane|planes]], and even [[Radio-controlled helicopter|helicopters]] and scale railway locomotives.
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== Design ==
RC electronics have three essential elements. The [[radiocontrol model transmitter|transmitter]] is the controller. Transmitters have control sticks, triggers, switches, and dials at the user's finger tips. The [[receiver (radio)|receiver]] is mounted in the model. It receives and processes the signal from the transmitter, translating it into signals that are sent to the servos and [[Electronic speed control|speed controllers]]. The number of servos in a model determines the number of [[
Typically the transmitter [[Multiplexer|multiplexes]] all the channels into a single [[pulse-position modulation]] radio signal. The receiver demodulates and demultiplexes the signal and translates it to the special kind of [[pulse-width modulation]] used by standard [[servomechanism#RC servos|RC servos]] and speed controllers.
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