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287 Cards in this Set
- Front
- Back
ATI |
Asset Tracking Interaction |
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BDA |
Battle Damage Assessment |
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MASINT |
Measurement and signature Intelligence |
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Absorption |
(1) Absorbing light waves. Does not allow any reflection or refraction. |
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Acoustics |
The science of Sound |
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Amplitude |
The portion of a cycle measured from a reference line to a maximum value above (or to
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ANGLE OF INCIDENCE |
The angle between the incident wave and the normal |
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ANGLE OF REFLECTION |
The angle between the reflected wave and the normal. |
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ANGLE OF REFRACTION |
The angle between the normal and the path of a wave through the second |
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ANGSTROM UNIT |
The unit used to define the wavelength of light waves |
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ANISOTROPIC |
The property of a radiator to emit strong radiation in one direction |
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ANTENNA |
A conductor or set of conductors used either to radiate rf energy into space or to collect rf |
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ARRAY OF ARRAYS |
Same as COMBINATION ARRAY. An array system that uses the characteristics of more than one array. |
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Bay |
Par of an antenna array |
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BEVERAGE ANTENNA |
A horizontal, longwire antenna designed for reception and transmission of |
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BIDIRECTIONAL ARRAY |
An array that radiates in opposite directions along the line of maximum |
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BROADSIDE ARRAY |
An array in which the direction of maximum radiation is perpendicular to the |
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CENTER-FEED METHOD |
Connecting the center of an antenna to a transmission line, which is then |
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CHARACTERISTIC IMPEDANCE |
The ratio of voltage to current at any given point on a |
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COAXIAL LINE |
A type of transmission line that contains two concentric conductors. |
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COLLINEAR ARRAY |
An array with all the elements in a straight line. Maximum radiation is |
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COMBINATION ARRAY |
An array system that uses the characteristics of more than one array. |
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COMPLEMENTARY (SECONDARY) COLORS OF LIGHT |
The colors of light produced when |
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COMPLEX WAVE |
A wave produced by combining two or more pure tones at the same time. |
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COMPRESSION WAVES |
Longitudinal waves that have been compressed (made more dense) as they |
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CONDUCTANCE |
The opposite of resistance in transmission lines. The minute amount of resistance |
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CREST (TOP) |
The peak of the positive alternation (maximum value above the line) of a wave. |
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COUPLING DEVICE |
A coupling coil that connects the transmitter to the feeder |
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CRITICAL ANGLE |
The maximum angle at which radio waves can be transmitted and still be |
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CURRENT STANDING-WAVE RATIO (ISWR) |
The ratio of maximum to minimum current along a |
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CYCLE |
—One complete alternation of a sine wave that has a maximum value above and a maximum |
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DAMPING |
—Reduction of energy by absorption. |
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DENSITY |
—(1) The compactness of a substance. (2) Mass per unit volume |
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DIFFRACTION |
—The bending of the paths of waves when the waves meet some form of obstruction. |
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DIPOLE |
—A common type of half-wave antenna made from a straight piece of wire cut in half. Each |
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DIRECTIVITY |
—The property of an array that causes more radiation to take place in certain directions |
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DISPERSION |
—The refraction of light waves that causes the different frequencies to bend at slightly |
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DOPPLER EFFECT |
—The apparent change in frequency or pitch when a sound source moves either |
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DRIVEN ELEMENT |
—An element of an antenna (transmitting or receiving) that is connected directly |
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ECHO |
—The reflection of the original sound wave as it bounces off a distant surface. |
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ELECTROMAGNETIC FIELD |
—The combination of an electric (E) field and a magnetic (H) field. |
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ELECTROMAGNETIC INTERFERENCE |
—Man-made or natural interference that degrades the |
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ELECTRIC (E) FIELD |
—The field produced as a result of a voltage charge on a conductor or antenna |
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ELEMENT |
—A part of an antenna that can be either an active radiator or a parasitic radiator |
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FLEXIBLE COAXIAL LINE |
—A coaxial line made with a flexible inner conductor insulated from the |
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FREE-SPACE LOSS |
—The loss of energy of a radio wave because of the spreading of the wavefront as |
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FREQUENCY |
—The number of cycles that occur in one second. Usually expressed in hertz |
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FREQUENCY DIVERSITY |
—Transmitting (and receiving) of radio waves on two different frequencies |
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GAIN |
—The ratio between the amount of energy propagated from an antenna that is directional to the |
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GROUND-PLANE ANTENNA |
—A type of antenna that uses a ground plane as a simulated ground to |
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GROUND REFLECTION LOSS |
—The loss of rf energy each time a radio wave is reflected from the |
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HARMONIC |
—A frequency that is a whole number multiple of a smaller base frequency. |
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HORIZONTAL AXIS |
—On a graph, the straight line axis plotted from left to right. |
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HORIZONTALLY POLARIZED |
—Waves that are radiated with their E field component parallel to the |
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INCIDENT WAVE |
—(1) The wave that strikes the surface of a medium. (2) The wave that travels from |
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INDUCTION FIELD |
—The electromagnetic field produced about an antenna when current and voltage |
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INFRASONIC (SUBSONIC) |
—Sounds below 15 hertz. |
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INPUT IMPEDANCE |
—The impedance presented to the transmitter by the transmission line and its |
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INTERCEPT |
—The point where two lines drawn on a graph cross each other. |
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IONOSPHERE |
—The most important region of the atmosphere extending from 31 miles to 250 miles |
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ISOTROPIC RADIATION |
—The radiation of energy equally in all directions. |
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LONGITUDINAL WAVES |
—Waves in which the disturbance (back and forth motion) takes place in |
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LUMPED-IMPEDANCE TUNING |
—The insertion of an inductor or capacitor in series with an antenna |
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MAGNETIC (H) FIELD |
—The field produced when current flows through a conductor or antenna. |
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MARCONI ANTENNA |
—A quarter-wave antenna oriented perpendicular to the earth and operated with |
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MEDIUM |
—The substance through which a wave travels from one point to the next. Air, water, wood, |
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MULTIELEMENT ARRAY |
—An array consisting of one or more arrays and classified as to directivity |
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NATURAL HORIZON |
—The line-of-sight horizon. |
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NODE |
—The fixed minimum points of voltage or current on a standing wave or antenna. |
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NONRESONANT LINE |
—A transmission line that has no standing waves of current or voltage. |
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NORMAL
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—The imaginary line perpendicular to the point at which the incident wave strikes the |
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ORIGIN |
—The point on a graph where the vertical and horizontal axes cross each other. |
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OUTPUT IMPEDANCE |
—The impedance presented to the load by the transmission line and its source. |
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PARASITIC ELEMENT |
—The passive element of an antenna array that is connected to neither the |
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PERIOD |
—The amount of time required for completion of one full cycle. |
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PITCH |
—A term used to describe the frequency of a sound heard by the human ear |
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PLANE OF POLARIZATION |
—The plane (vertical or horizontal) with respect to the earth in which the |
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POSITIVE ALTERNATION |
—The portion of a sine wave above the reference line. |
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POWER STANDING-WAVE RATIO (PSWR) |
—The ratio of the square of the maximum and |
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PRIMARY COLORS (OF LIGHT) |
—The three primary colors of light (red, green, and blue), from |
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RADIATION FIELD |
—The electromagnetic field that detaches itself from an antenna and travels |
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RADIATION LOSSES |
—The losses that occur when magnetic lines of force about a conductor are |
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RADIATION RESISTANCE |
—The resistance, which if inserted in place of an antenna, would consume |
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RADIO FREQUENCIES |
—Electromagnetic frequencies that fall between 3 kilohertz and 300 gigahertz |
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RADIO HORIZON |
—The boundary beyond the natural horizon in which radio waves cannot be |
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RECEIVER |
—The object that responds to a wave or disturbance. Same as detector |
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RECIPROCITY |
—The property of interchangeability of the same antenna for transmitting and receiving |
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REFLECTED WAVE |
—(1) The wave that reflects back from a medium. (2) Waves traveling from the |
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REFLECTOR |
—The parasitic element of an array that causes maximum energy radiation in a direction |
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REFRACTION |
—The changing of direction as a wave leaves one medium and enters another medium of |
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RESONANCE |
—The condition produced when the frequency of vibrations are the same as the natural |
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REVERBERATION |
—The multiple reflections of sound waves. |
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SELF-INDUCTION |
—The phenomenon caused by the expanding and collapsing fields of an electron |
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SHORT-CIRCUITED LINE |
—A transmission line that has a terminating impedance equal to 0. |
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SKIP DISTANCE |
—The distance from a transmitter to the point where the sky wave is first returned to |
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SKIP ZONE |
—A zone of silence between the point where the ground wave becomes too weak for |
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SKY WAVES |
—Radio waves reflected back to earth from the ionosphere |
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SPECTRUM |
—(1) The entire range of electromagnetic waves. (2) VISIBLE. The range of |
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SPORADIC E LAYER |
—Irregular cloud-like patches of unusually high ionization. Often forms at |
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STANDING-WAVE RATIO (SWR) |
—The ratio of the maximum (voltage, current) to the minimum |
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SURFACE WAVE |
—A radio wave that travels along the contours of the earth, thereby being highly |
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TEMPERATURE INVERSION |
—The condition in which warm air is formed above a layer of cool air |
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TRANSLUCENT |
—A type of substance, such as frosted glass, through which some light rays can pass |
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TRANSPARENT |
—A type of substance, such as glass, that transmits almost all of the light waves that |
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TRANSMISSION MEDIUMS |
—The various types of lines and waveguides used as transmission lines. |
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TROPOSPHERE |
—The portion of the atmosphere closest to the earth's surface, where all weather |
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TROUGH (BOTTOM) |
—The peak of the negative alternation (maximum value below the line). |
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TURNSTILE ANTENNA |
—A type of antenna used in vhf communications that is omnidirectional and |
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TWISTED PAIR |
—A line consisting of two insulated wires twisted together to form a flexible line |
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UNIDIRECTIONAL ARRAY |
—An array that radiates in only one general direction. (The opposite of this is an omnidirectional or multidirectional array) |
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UNTUNED LINE |
—Another name for the flat or nonresonant line. |
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VERTICALLY POLARIZED |
—Waves radiated with the E field component perpendicular to the earth's |
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VOLTAGE STANDING-WAVE RATIO (VSWR) |
—The ratio of maximum to minimum voltage of a |
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VELOCITY |
—The rate at which a disturbance travels through a medium |
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WAVEGUIDE |
—A hollow metal tube used as a transmission line to guide energy from one point to |
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WAVELENGTH |
—(1) The distance in space occupied by 1 cycle of a radio wave at any given instant. |
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AMPLITUDE |
—Used to represent values of electrical current or voltage. The greater its height, |
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AMPLITUDE MODULATION |
—Any method of varying the amplitude of an electromagnetic |
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ANGLE MODULATION |
—Modulation in which the angle of a sine-wave carrier is varied by a |
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BANDWIDTH |
—The section of the frequency spectrum that specific signals occupy. |
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BASE-INJECTION MODULATOR |
—Similar to control-grid modulator. Gain of a transistor is |
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BLOCKED-GRID KEYING |
—A method of keying in which the bias is varied to turn plate |
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BUFFER |
—A voltage amplifier used between the oscillator and power amplifier |
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CARRIER FREQUENCY |
—The assigned transmitter frequency |
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CATHODE KEYING |
—A system in which the cathode circuit is interrupted so that neither grid |
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CHANNEL |
—Carrier frequency assignment usually with a fixed bandwidth. |
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COLLECTOR-INJECTION MODULATOR |
—Transistor equivalent of plate modulator. |
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COMPLEX WAVE |
—A wave composed of two or more parts. |
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CONTINUOUS-WAVE KEYING |
—The "on-off" keying of a carrier. |
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CONTROL-GRID MODULATOR |
—Uses a variation of grid bias to vary the instantaneous |
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CUSPS |
—Sharp phase reversals. |
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CYCLE |
—360 degree rotation of a vector generating a sine wave. |
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DEMODULATION |
—The removal of intelligence from a transmission medium. |
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DIODE DETECTOR |
—A simple type of crystal receiver. |
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EMITTER-INJECTION MODULATOR |
—The transistor equivalent of the cathode modulator. |
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FINAL POWER AMPLIFIER (fpa) |
—The final stage of amplification in a transmitter. |
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FREQUENCY DEVIATION |
—The amount the frequency departs from the carrier frequency. |
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FREQUENCY MODULATION (fm) |
—Angle modulation in which the modulating signal |
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FREQUENCY |
—The rate at which the vector that generates a sine wave rotates. |
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FREQUENCY-SHIFT KEYING (fsk) |
—Frequency modulation somewhat similar to |
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GATED-BEAM DETECTOR |
—An fm demodulator that uses a special gated-beam tube to |
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HETERODYNING |
—Mixing two frequencies across a nonlinear impedance. |
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INSTANTANEOUS AMPLITUDE |
—The amplitude at any given point along a sine wave at a |
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INTERMEDIATE POWER AMPLIFIER (ipa) |
—The amplifier between the oscillator and |
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KEY CLICKS |
—Interference in the form of "clicks" or "thumps" caused by the sudden |
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LINEAR IMPEDANCE |
—An impedance in which a change in current through a device changes |
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LOWER SIDEBAND |
—All difference frequencies below that of the carrier. |
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MACHINE KEYING |
—A method of cw keying using punched tape or other mechanical means |
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MARK |
—An interval during which a signal is present. Also the presence of an rf signal in cw |
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MASTER OSCILLATOR POWER AMPLIFIER (MOPA) |
—A transmitter in which the |
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MODULATED WAVE |
—A complex wave consisting of a carrier and a modulating wave that is |
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MODULATION FACTOR (M |
)—An indication of relative magnitudes of the rf carrier and the |
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MODULATION |
—The ability to impress intelligence upon a transmission medium, such as radio |
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OVERMODULATION |
—A condition that exists when the peaks of the modulating signal are |
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PERIOD |
—The duration of a waveform |
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PHASE MODULATION (pm) |
—Angle modulation in which the phase of the carrier is |
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PHASE-SHIFT KEYING |
—Similar to ON-OFF cw keying in AM systems and frequency-shift |
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PULSE DURATION (pd) |
—The period of time during which a pulse is present. |
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PULSE MODULATION |
—A form of modulation in which one of the characteristics of a pulse |
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PULSE WIDTH (pw) |
—The period of time during which a pulse occurs. |
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PULSE-AMPLITUDE MODULATION (pam) |
—Pulse modulation in which the amplitude of |
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PULSE-DURATION MODULATION (pdm) |
—Pulse modulation in which the time duration |
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REACTANCE TUBE |
—A tube connected in parallel with the tank circuit of an oscillator. |
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SHUNT |
—Means the same as parallel or to place in parallel with other components. |
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SIGNAL DISTORTION |
—Any unwanted change to the signal. |
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SPACE |
—Absence of an rf signal in cw keying. Key-open condition or lack of data in |
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UPPER SIDEBAND |
—All of the sum frequencies above the carrier |
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WAVELENGTH |
—The physical dimension of a sine wave. |
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APOGEE |
—The point in the orbit of a satellite the greatest distance from the earth. |
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ASSEMBLY |
—A number of parts or subassemblies, or any combination thereof, joined together to |
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ASYNCHRONOUS ORBIT |
—One where the satellite does not rotate or move at the same speed as the |
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AUDIO FREQUENCY TONE SHIFT |
—A system that uses amplitude modulation to change dc mark |
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BALANCED PHASE DETECTOR |
—A circuit that controls the oscillator frequency (afc). |
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BAUD |
—A measurement of speed based on the number of code elements or units per second. |
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CODE |
—In teletypewriter operation, code is a combination of mark and space conditions representing |
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COHERENT |
—Radiation on one frequency. |
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COMPARATOR |
—An equipment that compares incoming signals and selects the strongest to be fed to a |
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CONVERTER |
—An equipment that changes the audio output of a receiver to dc pulses. These pulses are |
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DETECTION |
—The separation of low-frequency (audio) intelligence from the high (radio) frequency |
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DOUBLING UP |
—This is a type of two-equipment installation where one unit can be substituted for |
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DOWN LINK |
—The frequency used to transmit an amplified signal from the satellite back to earth. |
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DUMMY LOAD` |
—A nonradiating device that absorbs the rf and has the impedance characteristics of the |
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ECLIPSE |
—This occurs when the satellite is not in view or in direct line of sight with the sun. This |
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ELECTROMAGNETIC INTERFERENCE |
—A term used to describe the degradation of a receiver or |
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EPHEMERIS |
—A table showing the precalculated position of a satellite at any given time |
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FACSIMILE |
—The method for transmitting and receiving still images. These images can be maps, |
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FIDELITY |
—The ability of a receiver to accurately reproduce, at its output, the signal at its input |
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FRAMING |
—The process of synchronizing a facsimile receiver to a transmitter. This allows proper |
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FREQUENCY-DIVISION MULTIPLEXING |
—Multiplexing that transmits and receives the full 360 |
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FREQUENCY SYNTHESIZER |
—A frequency source of high accuracy. |
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GANGED TUNING |
—The process used to tune two or more circuits with a single control. |
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HARMONIC |
—An exact multiple of the fundamental frequency. Even harmonics are 2, 4, and so on, |
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HELIX |
—A large coil of wire. It acts as a coil and is used with variable inductors for impedance |
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INCLINED ORBIT |
—Orbits where there is some amount of inclination. These include equatorial and |
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LASER |
—An acronym for light amplification by stimulated emission of radiation |
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MEDIUM ALTITUDE ORBIT |
—An orbit from 2,000 to 12,000 miles above the earth. The rotation rate |
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MULTICOUPLERS |
—Couplers patch receivers or transmitters to antennas. They also filter out |
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MULTIPLEXING |
—A method for simultaneous transmission of two or more signals over a common |
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NEAR SYNCHRONOUS ORBIT |
—An orbit in which the satellite rotates close to but not exactly at the |
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NOISE SILENCER, NOISE SUPPRESSOR, OR NOISE LIMITER |
—Circuits that clip the peaks of |
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ORDER-WIRE CIRCUIT |
—A circuit between operators used for operations control and coordination. |
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PASSIVE SATELLITE |
—A satellite that reflects radio signals back to earth |
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PERFORATOR |
—A device that stores a teletypewriter message on a paper tape. It may be stored for |
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PERIGEE |
—The point in the orbit of a satellite closest to the earth. |
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POLAR ORBIT |
—An orbit that has an angle of inclination of or near 90 degrees. |
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RADIO FREQUENCY CARRIER SHIFT |
—The system that uses a keyer to shift a radio frequency |
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RECEPTION |
—The instant when an electromagnetic wave passes through a receiver antenna and |
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RUNNING OPEN |
—The teletypewriter condition where the type hammer constantly strikes the type box |
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SCANNING |
—The process of subdividing a picture in an orderly manner into segments. This is used in |
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SCANNING |
—The ability of a receiver to select the desired signal and reject unwanted signals |
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SENSITIVITY |
—The ability of a receiver to reproduce very weak signals. The greater the receiver |
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SUPPRESSION |
—The process of eliminating an undesired portion of a signal. |
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SYNCHRONOUS ORBIT |
—An orbit in which the satellite moves or rotates at the same speed as the |
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TELECOMMUNICATIONS |
—The transmission, emission, or reception of signs, signals, writings, |
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TEMPEST |
—A term normally used to describe compromising emanations. These emanations are |
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TOP-HAT |
—An antenna that is center-fed and capacitively loaded. |
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TRANSITION |
—The time it takes to shift from a mark to a space condition or from a space to a mark |
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UP LINK |
—The frequency used to transmit a signal from earth to a satellite. |
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ZONE OF MUTUAL VISIBILITY |
—The area where the satellite can be seen by both the up- and |
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Access |
The ability and opportunity to obtain knowledge of classified |
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Access Authorization |
A formal determination that a person meets the personnel |
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Account Manager |
The individual responsible for establishing local JPAS access |
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ACES |
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Adjudication |
The process of an examination of a sufficient amount of |
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Adverse Action |
A removal from employment, suspension from employment of more |
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Break-in-Service |
When continuous service is disrupted for a period of time |
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Classification Management |
A discipline which seeks to ensure that official information is |
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Communications Security (COMSEC) |
The protective measures taken to deny unauthorized persons |
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Compelling Need |
A senior official's (or designee's) signed determination, based |
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Compromise
|
A security violation that has resulted in confirmed or suspected |
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Counterintelligence |
Counterintelligence means information gathered and activities |
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CNWDI |
Critical Nuclear Weapon Design Information: Top secret restricted data or secret restricted data pertaining to nuclear weaponry. |
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DCII |
Defense Central Index of Investigations: DCII is the single, automated, central |
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Deliberate Compromise |
Any intentional act done with the intent of conveying classified |
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ENTNAC |
Entrance National Agency Check:An FBI fingerprint check conducted on first term military |
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e-Qip |
The Electronic Questionnaires for Investigations Processing is a |
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Deviation |
Clearance or SCI access granted or continued |
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FAD |
Facility Access Determination: A process whereby commanding officers may request personnel security investigations and review the results to determine whether to allow the identified person(s) access to facilities (Authority drawn from the Internal Security Act of 1950) |
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Incident Report |
A report of developed issue information forwarded to the CAF |
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Local Agency Checks (LAC) |
A check of civilian law enforcement, criminal, civil courts, |
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Local Records Checks (LRC) |
A command review of available personnel, medical, legal, |
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NISP |
National Industrial Security Program: National program to safeguard classified information that is |
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PSI |
Personnel Security Investigations: Any investigation conducted for the purpose of determining the |
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PSAB |
The Personnel Security Appeals Board (PSAB) is the appellate
|
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Scope |
The time period to be covered and the sources of information to |
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SMO |
Security Management Office: For purposes of JPAS, a Security Management Office is a local |
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Security Violation |
Any failure to comply with the regulations for the protection |
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SCI |
Sensitive Compartmented Information: |
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Sensitive Information |
Any information the loss, misuse, or unauthorized access to or |
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SSBI |
Single Scope Background Investigation (SSBI) |
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SAP |
Special Access Program (SAP) |
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SII |
Special Investigative Inquiry (SII) |
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SBU |
State Sensitive But Unclassified (SBU) |
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Unfavorable Administrative Action |
Action taken as the result of an unfavorable personnel security |
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Unauthorized Disclosure |
A communication or physical transfer of classified information |
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ACCM |
Alternative Compensatory Control Measures (ACCM) – Used when an |
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Assist Visit
|
- The informal assessment of the security posture |
|
Associated Markings |
- The classification authority, office of |
|
Code Word |
- A single classified word assigned a classified |
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CSO |
Cognizant Security Office (CSO) - An office functioning on
|
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Collateral Information |
- Information identified as NSI under the |
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Compromise |
- An unauthorized disclosure of classified |
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Confidential |
– A classification level applied to information, |
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CSS |
Constant Surveillance Service (CSS) - A transportation |
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Counterintelligence (CI)
|
- Intelligence activity, with its |
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Cryptanalysis |
- The analysis of encrypted messages; the steps or |
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Cryptography |
- The branch of cryptology that treats the |
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Cryptology |
- The branch of knowledge that treats the principles |
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Declassification Authority |
- The official who authorizes |
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Derivative Classification |
- The incorporating, paraphrasing, |
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Downgrading |
- The determination by an approved authority that |
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EKMS |
Electronic Key Management System (EKMS)- Consists of four tiers |
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Information Security (INFOSEC) |
- The system of policies, procedures, and |
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Information Assurance |
- Measures that protect and defend |
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Information Assurance Manager (IAM) |
- Responsible for the |
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Information Assurance Officer (IAO) |
- Implements and enforces |
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Infraction |
- Any knowing, willful, or negligent action contrary |
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Nickname |
- A combination of two separate unclassified words, |
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NATO |
– A military alliance |
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OCA |
Original Classification Authority (OCA) - An official authorized |
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Preliminary Inquiry (PI) |
The "initial" process to determine |
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PPP |
Program Protection Plan |
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RANKIN |
Retrieval and Analysis of Navy K(C)lassified INformation |
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Safeguarding |
Measures and controls prescribed to protect |
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SIGINT |
Signals Intelligence (SIGINT) - Intelligence information |
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Telecommunications -
|
The preparation, transmission, or |
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Top Secret |
- A classification level applied to information, the |