How Does an FM Radio Work?

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An FM radio works by using a power source and antenna to pick up FM radio signals in the air, which then pass through the amplifier section of the radio to produce sound on the speakers. Use the volume control, tone control and digital synthesizer on an FM radio with help from the owner of an electronics store in this free video on radios.

Part of the Video Series: Electronics Facts
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Video Transcript

Okay, how does an FM radio work? First of all you need the, either some type of power source for the radio. This won't happens to run off electricity. You can get FM radios that also run of battery power and there's also emergency radios which you can actually crank up and generates some electricity with a dynamo that run the radio for about thirty minutes to an hour. This one needs an antenna, there's an antenna connection in the back. If it comes with an antenna, just insert it over the connection so you can pull in the FM station that come through the air from a broadcasting antenna. The FM signals are modulated inside the radio and then pass through the amplifier section of the radio; therefore producing sound out of the speaker. This particular radio is a digital radio so it'll tune your stations in with a digital synthesize tuner. That doesn't mean it's receiving digital signals, it's still receiving in analogue signals but the way it processes those FM analogue signals is done with a digital synthesize tuner. There are also volume controls and tone controls on the front of this radio and this one, this particular one has a clock.

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