Magnetic Loop Antenna
A good overview of how loop antennas work by an example project of PA3FG (10-17 meter antenna).
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A very interesting project file from qrpbuilder.com including all necessary measurements for production: Magnetic Loop Antenna
Care must be taken not to touch the loop when transmitting and to keep a safe distance away from the loop’s magnetic near-field to ensure conservative compliance with electromagnetic radiation / EMR standards for human exposure to EM fields. A distance equal to or greater than one or two loop diameters away is generally a safe field strength region . RF burns to the skin from touching the loop while transmitting are very unpleasant and take a long time to heal.
Steve Yates, AA5TB
About Magnetic Loop (VK5KLT)
Calculate Magnetic Loop, AA5TB (.XLS)
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Automatically Tune a Magnetic Loop Antenna