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O

ORIGIN

The point on a graph where the vertical and horizontal axes cross each other [10].

OSCILLATOR

An oscillator is a nonrotating device that produces alternating current. The frequency is determined by the characteristics of the device [9].

OUT-OF-CIRCUIT METER

A meter that is not permanently installed in a circuit. Usually portable and
self-contained, these meters are used to check the operation of a circuit or to isolate troubles within a circuit [3].

OUTPUT END

The end of a transmission line that is opposite the source; receiving end [10].

OUTPUT IMPEDANCE

The impedance that is presented to the load by the transmission line and its
source [10].

OVERDRIVEN

When the input signal amplitude is increased to the point that the transistor goes into saturation and cutoff [7].

OVERMODULATION

A condition that exists when the peaks of the modulating signal are limited [12].

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