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Radio Frequency and Wavelength Ranges Radio Frequency and Wavelength Ranges
Radio Modulation Radio Modulation
Components in a Transistor Radio Components in a Transistor Radio

Radio Modulation

Radio Modulation
Audio-frequency waves must be combined with carrier waves in order to be transmitted over the radio. Either the frequency (rate of oscillation) or the amplitude (height) of the waves may be modified in a process called modulation. This accounts for the option on the radio dial for AM or FM stations; the signals are very different, so both kinds may not be received simultaneously.
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