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How Radio Scanners Work

A brief description of how Radio Scanners work. This site is part of Marshall Brain's HowStuffWorks.com.

http://www.howstuffworks.com/radio-scanner.htm

Building a Simple Crystal Radio

A set of instructions for building a crystal radio at home, includes photos to help.

http://scitoys.com/scitoys/scitoys/radio/radio.html#crystal

Transverse and longitudinal waves.

Gives definitions of transverse and longitudinal waves with animation consisting of words moving to show how waves move in a medium.

http://id.mind.net/~zona/mstm/physics/waves/transLongWaves/transAndLongWavesHome.htm

How Radio Controlled Toys Work

A brief description of how Radio Controlled Toys work. This site is part of Marshall Brain's HowStuffWorks.com.

http://www.howstuffworks.com/rc-toy.htm

Crystal Radio

Instructions and circuit diagrams for building a crystal radio circuit.

http://www.techlib.com/electronics/crystal.html

AM radio uses the electrical image of a sound source to modulate the amplitude of a carrier wave. At the receiver end in the detection process, that image is stripped back off the carrier and turned ...

http://hyperphysics.phy-astr.gsu.edu/hbase/audio/bcast.html#c3

Fm Radio

FM radio uses the electrical image of a sound source to modulate the frequency of a carrier wave. At the receiver end in the detection process, that image is stripped back off the carrier and turned ...