Loading coil
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A loading coil or load coil is an inductor that is inserted into an electronic circuit to increase its inductance. The term originated in the 19th century for inductors used to prevent signal distortion in long-distance telegraph transmission cables. The term is also used for inductors in radio antennas, or between the antenna and its feedline, to make an electrically short antenna resonant at its operating frequency.
Pupin coils in PTT Museum in Belgrade (Serbia)
A typical mobile antenna with a center-placed loading coil
An enormous antenna loading coil used in a powerful longwave radiotelegraph station in New Jersey in 1912
Image: Toroidal telephone loading coil
T-carrier
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The T-carrier is a member of the series of carrier systems developed by AT&T Bell Laboratories for digital transmission of multiplexed telephone calls.
