The radio consists of a transmitter, receiver, servo(s), and battery pack.  The most common transmitter used for cars is the Pistol grip style where the trigger is the throttle and the wheel on the side is for steering.  Most models have the ability to zero or null both the throttle and the steering.  The Radios are available in either Amplitude Modulation (AM), Frequency Modulation (FM), or FM Pulse Code Modulation (PCM).  Both the transmitter and receiver must be of the same kind.  AM radios suffer from noise and control drift.  FM radios have better noise performance and less control drift.  PCM FM radios minimize noise and drift effects.



    The receiver mounted in the car has an antenna wire that is fed through a small plastic tube that is attached to the chassis.  The receiver has a crystal that must match the crystal in the transmitter.  AM and FM crystals are different.  The receiver also has connections for a battery pack and two servos.



    The receiver battery pack provides power for the receiver and servos but is unnecessary if you use an Electronic Speed Control (ESC) that has Battery Elimination Circuitry (BEC).



    Two servos are needed if you plan to use a mechanical speed control, otherwise just one for steering is required.  The primary categories of servos include standard, high torque, miniature, and micro.  Some have ball bearings other bushings.  I use a ball-bearing high torque servo.  The high torque uses more power but really helps for high speed hair-pin turns.  The ball bearing gives longer life and better steering stability

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