PowerPoint Presentation

RadioHow Stations Share The Same Air and How We Listen To Only One StationStations Divided By Frequency

KISSWBCNWBURkHzMHz

Do Stations Interfere?Yes!Is This Interference Reversible?Fortunately Yes!Combination of Transmitters

KISS 108FMWBUR90.8FMYour Car, iPod, etc.TransmitterReceiverTransmitterListening 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 outputsInputs at other frequencies give small outputs

OutputInputSwing Set

Mass-Spring (Slinky)InputOutput

Changing Stations

InputOutput

InputOutputWBURN90.8FMKISS108FMChange something about resonator to Tune it to a frequency (station) of choice

Knob on radio changes an electrical resonator

M1M2Big Picture

WBURN90.8FMMultiple StationsCombined WavesResonatorSingle Station