loading

/loh"ding/, n.
1. the act of a person or thing that loads.
2. that with which something is loaded; load, burden, or charge.
3. Elect. the process of adding reactance to a telephone circuit, radio antenna, etc.
4. Aeron. the ratio of the gross weight of an airplane to engine power (power loading), wing span (span loading), or wing area (wing loading).
5. Insurance. an addition to the net premium, to cover expenses and allow a margin for contingencies and profit.
[1425-75; late ME; see LOAD, -ING1]

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      in communications technology, addition of inductance to an antenna or at periodic intervals to a transmission line to improve operating characteristics. Loading coils in telephone lines may be spaced as close as one mile. Counteracting the effects of capacitance, they make line impedance approach the equivalence of pure resistance.

      Radio antennas that are too short to be resonant at their operating frequency can be made to approach resonance by inserting a coil in series in the antenna circuit. Automobile radios generally include loading coils because whip antennas are much too short to resonate at broadcast frequencies. Some telephone and telegraph cables are provided with continuous loading by being wrapped with a spiral of magnetic material.

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Universalium. 2010.

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