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Radio

Radio. How Stations Share The Same Air and How We Listen To Only One Station. Stations Divided By Frequency. WBUR. WBCN. KISS. kHz. MHz. Do Stations Interfere? Yes! Is This Interference Reversible? Fortunately Yes!. Combination of Transmitters. Transmitter. WBUR 90.8FM. Receiver.

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Radio

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  1. Radio How Stations Share The Same Air and How We Listen To Only One Station

  2. Stations Divided By Frequency WBUR WBCN KISS kHz MHz • Do Stations Interfere? • Yes! • Is This Interference Reversible? • Fortunately Yes!

  3. Combination of Transmitters Transmitter WBUR 90.8FM Receiver Your Car, iPod, etc. Transmitter KISS 108FM

  4. Listening to One Station • Receiver gets combination of two frequencies (stations) • We want to recover one frequency (station) • Resonators! • Small inputs at correct frequency give big outputs • Inputs at other frequencies give small outputs Mass-Spring (Slinky) Swing Set Output Input Input Output

  5. Changing Stations • Change something about resonator to “Tune” it to a frequency (station) of choice • Knob on radio changes an electrical resonator Input Output WBURN 90.8FM M1 Input Output KISS 108FM M2

  6. Big Picture Multiple Stations Combined Waves WBURN 90.8FM Single Station Resonator

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