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AM, FM and tuning
A radio carrier is a rapidly varying signal used to convey information. AM varies amplitude; FM varies frequency. A receiver selects a station and recovers the audio information from its modulation.
An antenna receives many signals. Tuning and filtering improve selection, but interference, signal strength and antenna orientation affect reception. Digital broadcasts use additional methods beyond this introductory model.
Worked example
An AM receiver extracts the audio envelope from a modulated carrier; an FM receiver responds to frequency variations.
Try it yourself
Draw a block diagram: antenna → selection → demodulation → audio amplification → speaker.
Check your understanding
What changes in frequency modulation?
FM conveys information through frequency variations.
References and further reading
Lessons and examples are original introductory material. These references offer further study; their material is not included as a copied course.
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