loading coil

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loading coil

[′lōd·iŋ ‚kȯil]
(electromagnetism)
An iron-core coil connected into a telephone line or cable at regular intervals to lessen the effect of line capacitance and reduce distortion. Also known as Pupin coil; telephone loading coil.
A coil inserted in series with a radio antenna to increase its electrical length and thereby lower the resonant frequency.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

load coil

A device placed into a telephone circuit between the end office and the subscriber to step up the voltage and compensate for signal loss due to bridged taps. The load coil is an inductive device that acts as a high-frequency choke and must be removed if the line is converted to high-speed digital use. When digital service is moved closer to the customer, and the analog lines become shorter, the load coils are no longer required. See bridged tap.
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