1-11
CIRCULAR MIL—An area equal to that of a circle with a diameter of 0.001 inch. It is used for measuring
the cross-sectional area of wires [1].
CIRCULAR MIL-FOOT—A unit of volume of a conductor having a cross-sectional area of 1 circular mil
and a length of 1 foot [4].
CLAMPER—A circuit in which either the upper or lower extremity of a waveform is fixed at a desired
value [9].
CLASS A AMPLIFIER OPERATION—The type of operation in which the amplifier is biased so that
variations in input signal polarities occur within the limits of cutoff and saturation [7].
CLASS AB AMPLIFIER OPERATION—The type of operation in which the amplifier is biased so that
collector current is cut off for a portion of the alternation of the input signal [7].
CLASS B AMPLIFIER OPERATION—The type of operation in which the amplifier is biased so that
collector current is cut off for one-half of the input signal [7].
CLASS C AMPLIFIER OPERATION—The type of operation in which the amplifier is biased so that
collector current is cut off for more than one-half of the input signal [7] [13].
CLUTTER—Confusing, unwanted echoes that interfere with the observation of desired signals on a radar
indicator [18].
COAXIAL CABLE—Cable in which the center conductor is separated from an outer conductor by a
dielectric material; used in RF transmission [4].
COAXIAL LINE—A type of transmission line that contains two concentric conductors [10].
CODE—In teletypewriter operation, code is a combination of mark and space conditions representing
symbols, figures, or letters [17].
COEFFICIENT OF COUPLING—An expression of the extent to which two inductors are coupled by
magnetic lines of force. This is expressed as a decimal or percentage of maximum possible coupling
and represented by the letter K [2].
COHERENCE—A definite phase relationship between two energy waves, such as transmitted frequency
and reference frequency [18].
COHERENT—Radiation on one frequency [17].
COHERENT OSCILLATOR—In cw radar an oscillator that supplies phase references to provide coherent
video from target returns [18].
COIL—An inductive device made by looping turns of wire around a core [2].
COLD-CATHODE TUBE—A gas-filled electron tube that conducts without the use of filaments. Cold-
cathode tubes are used as voltage regulators [6].
COLLECTOR—The element in a transistor that collects the current carriers [7].
COLLECTOR-INJECTION MODULATOR—The transistor equivalent of a plate modulator.
Modulating voltage is applied to a collector circuit [12].
