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Drive the stake into the ground, or find a convenient metal fence post.A diode allows current to flow through in one direction but not the other, so it clips off one side of the wave, like this: In the case of an AM radio, the detector is made with an electronic component called a diode. This is done with a part of the radio called a detector or demodulator. Now the radio has to extract the DJ's voice out of that sine wave. The tuner causes the radio to receive just one sine wave frequency (in this case, 680,000 hertz).It is easy to create a resonator with a capacitor and an inductor (check out How Oscillators Work to see how inductors and capacitors work together to create a tuner). That is, tuners resonate at, and amplify, one particular frequency and ignore all the other frequencies in the air. Tuners work using a principle called resonance. In this case, the tuner is tuned to receive the 680,000-hertz signal. The job of a tuner is to separate one sine wave from the thousands of radio signals that the antenna receives. The antenna will receive thousands of sine waves. An AM antenna is simply a wire or a metal stick that increases the amount of metal the transmitter's waves can interact with. Unless you are sitting right beside the transmitter, your radio receiver needs an antenna to help it pick the transmitter's radio waves out of the air.In this article, we will explore the technology of radio so that you can completely understand how invisible radio waves make so many things possible! The story of how something so simple has become a bedrock technology of the modern world is fascinating! With just a couple of electronic components that cost at most a d­ollar or two, you can build simple radio transmitters and receivers. ­The funny thing is that, at its core, radio is an incredibly simple technology.

The current trend toward wireless Internet access uses radio as well, and that means a lot more convenience in the future! Things like communication and navigation satellites would be impossible without radio waves, as would modern aviation - an airplane depends on a dozen different radio systems. Even things like radar and microwave ovens depend on radio waves.