![]() ![]() The ratio of inductance after and before a core with the diameter of the coil has been inserted inside it is called relative permeability (denoted μ r). Winding a coil, over a ferromagnetic coil focuses the magnetic field, increasing the inductance. Air cores are the most broadband but getting high inductances means using a lot of wire, they are also not the most efficient do to the magnetic field escaping the coil – this escaping magnetic can cause interference by inducting in nearby wires and other coils. ![]() There are different methods of making coils, depending on the area of use and inductance needed. Winding coils is not hard but quite time-consuming. ![]() Every hobbyist wanting to dabble in radio has to – at some point – wind a coil or two, be it the antenna coil of an AM radio, a coil on a toroidal core for a bandpass filter in a communications transceiver or a centrally tapped coil for use in a hartley oscillator. ![]()
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