Radios have two parts they need in order to work, the transmitter and the receiver. First the Oscillator creates a alternating current at the frequency the transmitter will transmit. Then the modulator adds information to the wave caring it. There are two ways to add information, amplitude modification aka. AM, frequency modification aka. PM. The amplifier then amplifies the wave and makes it more powerful. The antenna then converts the signal to radio waves.
Then the receiver, at the opposite end uses a attenna that captures a small alternating current. Then the RF amplifier amplifies it so that it can be processed. The tuner then extracts signals with a certain frequency. Then the detector extracts the audio information from that. Then the audio amplifier makes it loud enough to hear.
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