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Radio frequency coil
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Crystal Radio Coil Winding
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Radio frequency coils
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Connecting the Crystal Radio Coil
Step one of my crystal radio: the coil. : r/amateurradio
File:International Labour Day Edit-a-Thon - crystal radio with crystal diode and dual slide tuning coil.JPG - Wikimedia Commons
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Building A Great Crystal Radio | Jim Kerkhoff
