Poulsen Arc.
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An "electric arc" may generate radio frequency noise. There are many devices, having various purposes, which generate RF. Jacobs Ladder, arc welder, Tesla Coil, radio transmitter, microwave oven... Some generate RF for a specific purpose, others generate RF as a by-product.
A radio receiver is an electronic device that receives radio wave/signal and convert the information carried by them to a usuable form through speaker. The principal functions of a radio receiver are frequency selection, amplification and detection of signals which are been convert back to its original form through the help of radio speaker.
A RF amplifier is a device for electrically amplifying the power of an electrical signal, typically, but not exclusively, radio frequency signals.
a high power, often class C amplifier.
To change the frequency on a radio controller car, you change the crystal in the transmitter and receiver.