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Comms > D-F > Flashcards

D-F Flashcards

Contains common communication terms starting with letter D up to letter F. Taken from Comms Dictionary

1
Q

A sinusoidal wave in which the amplitude steadily decreases with time. Often associated with energy loss.

A

Damped Wave

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2
Q
  1. The process of smoothing out oscillations
  2. In a meter, this process is used to keep the pointer of the meter from overshooting the correct reading
  3. a mechanical or electrical technique used in synchronous receivers to prevent the rotor from oscillating or spinning. It is also used in servo systems to minimize overshoot of the load.
A

Damping

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3
Q

Facts represented by numbers, letters, or symbols to which meaning is or can be assigned.

A

Data

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4
Q

A structured collection of data that can e extracted, organized, and manipulated by a program

A

Data Base

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5
Q

A short circuit having minimum resitance

A

Dead Short

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6
Q

The process of finding errors (bugs) in a program or system and correcting them so that the program or system runs correctly.

A

Debugging

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7
Q

Feedback in which the feedback signal is out of phase with the input signal.

A

Degenerative Feedback

AKA Negative Feedback

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8
Q

a three-phase connection in which windings are connected end-to-end, forming a closed loop. A separate phase wire is then connected to each of the three junctions.

A

Delta

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9
Q

The removal of intelligence from a transmission medium.

A

Demodulation

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10
Q

Operational phase of a fire-control or track radar during which the radar is directed to the general direction of a desired target.

A

Designation

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11
Q

The separation of low-frequency (audio) intelligence from the high-frequency carrier

A

Detection

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12
Q

An insulator; a term applied to the insulating material between the plates of a capacitor

A

Dielectric

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13
Q

A circuit that amplifies the difference between two input signals

A

Differential Amplifier

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14
Q

The ability of an antenna to radiate or receiver more energy in some directions than in others. The degree of sharpness of the antenna beam

A

Directivity

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15
Q

The parasitic element of an array that reinforces energy coming from the driver element

A

DDirector

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16
Q

A circuit in which amplitude variation s are derived in response to phase or frequency vatiations

A

Discriminator

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17
Q

The refraction of light waves that cases the different frequencies to bend at slightly different angles

A

Dispersion

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18
Q

Any unwanted change between an input signal and output signal

A

Distortion

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19
Q

The easiest mode to produce in a wave guide, and the most efficient mode in terms of energy transfer

A

Dominant Mode

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20
Q

An impurity that can make a semiconductor material an N-type by donating extra “free” electrons to the conduction band.

A

Donor

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21
Q
  1. The apparent change in frequency or pitch when a sound source moves either toward or away from a listener
  2. in radar, the change in frequency of a received signal caused by the relative motion between the radar and the target
A

Doppler Effect

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22
Q

The difference between transmitted and reflected frequencies;

A

Doppler Frequency

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23
Q

Another name for the dipole antenna

A

Doublet

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24
Q

The length of time the computer is note operating, either because of preventive maintenance or a malfunction

A

Down Time

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25
Q

The frictional tension differential across the contact area caused when the tape contacts some element in the tape path.

A

Drag

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26
Q

The final stage of amplificatin

A

Driver

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27
Q

Provides dehumidified air for electronic equipment that is moisture critical

A

Dry-Air System

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28
Q

An electrical cell in which the electrolyte is not a liquid, instead, it is commonly a paste.

A

Dry Cell

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29
Q

Easily drawn out as to form filaments or wires

A

Ductile

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30
Q

Trapping of an rf wave between two layers of the earth’s atmosphere or between an atmospheric layer and the earth

A

Ducting

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31
Q

A dissipative but nonradiating device that has the impedance characteristics of an antenna or transmission line

A

Dummy Load

AKA Artificial Load

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32
Q

In a transmitter, ratio of time on to time off

A

Duty Cycle

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33
Q
  1. The bandwidth within which a satisfactory signal-to-noise ratio is obtained
A

Dynamic Range

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34
Q

An 8-bit coding system for representing uppercase and lower case letters, numbers and special characters.

A

EBCDIC (Extended Binary Coded Decimal Interchange Code)

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35
Q

A resonant cavity device that is used to check the overall performance of a radar system. It receives a portion of the transmitted pulse and re transmits it back to the receiver as a slowly decaying transient.

A

Echo box

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36
Q

A condition in which the satellite is not in view or in direct line of sight with the sun. This happens when the earth is between them.

A

Eclipse

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37
Q

The phenomenon wherein electrons emitted from a heated element with a vacuum tube will flow to a second element that is connected to a positive potential

A

Edison Effect (Richardson effect)

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38
Q

Field that exists when a difference in electrical potential causes a stress in the dielectric between two points.

A

E-field

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39
Q

Electric energy stored on or in an object. The negative charge is caused by an excess of electrons; the positive charge is caused by a deficiency of electrons

A

Electrical Charge

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40
Q

A synchro zeroing method. This method is used only when the rotors of the synchros to be zeroed are free to turn and their leads are accessible

A

Electrical Lock

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41
Q

A standard synchro position, with a definite set of stator voltages, that is used as the reference point for alignment of all synchro units

A

Electrical Zero

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42
Q

The terminal at which electricity passes from one medium into another, such as in an electrical cell where the current leaves or returns to the electrolyte

A

Electrode

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43
Q

A meter movement using fixed field coils and a moving coil; usually used in ammeters and wattmeters.

A

Electrodynamic Meter Movement

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44
Q

A meter using an electrodynamic movement to measure an electric current

A

Electrodynamometer

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45
Q

The process of changing the chemical composition of a material by passing an electric current through it.

A

Electrolysis

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46
Q

An electrically excited magnet capable of exerting mechanical force or of performing mechanical work

A

Electromagnet

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47
Q

The combination of an electric field and a magnetic fiedl

A

Electromagnetic Field

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48
Q

Man-made or natural interference that degrades the quality of reception of radio waves.

A

Electromagnetic Interference

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49
Q

The generation of a magnetic field around a current-carrying conductor

A

Electromagnetism

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50
Q

The force (voltage) that produces an electric current in a circuit

A

Electromotive Force

51
Q

The elementary negative charge that revolves around the nucleus of an atom

A

Electron

52
Q

The movement of an electron around the nucleus of an atom

A

Electron Orbital movement

53
Q

A group of electrons which have a common energy level that forms part of the outer structure (shell) of an atom

A

Electron Shell

54
Q

A device that provides an alternate dry-air input in the event of failure of the central dry-air system. It may include a compressor

A

Electronic Equipment Degydrator

55
Q

An instrument that counts the number of cycles (pulses) occurring during ta precise time interval.

A

Electronic Frequency Counter

56
Q

A circuit that causes a start-and-stop switching action by electronic means

A

Electronic Switch

57
Q

A common line for providing dry air to various electronic equipment, such as search radar, fire-control radar and repeaters

A

Electronics Dry-Air Branch

58
Q

In a reflex klystron, changing the frequency and output power of the tube by altering the repeller voltage

A

Electronic Tuning

59
Q

The movement of an electron around its axis

A

Electron Spin

60
Q

Pertaining to electricity at rest, such as charges on an object.

A

Electrostatic

61
Q

Electronic components that are susceptible to damage from static charges

A

Electrostatic-Discharge Sensitive (ESDS) Device

62
Q

A meter movement that uses the electrostatic repulsion of two sets of charged plates. This meter movement reacts to voltage rather than to current and is used to measure high voltage

A

Electrostatic Meter Movement

63
Q

The force exerted on an insulator by the voltage in a conductor

A

Electrostatic Stress

64
Q
  1. A substance, in chemistry, that cannot be divided into simpler substances by any means ordinarily available
  2. A part of an antenna that can be either an active radiator a parasitic radiator
A

Element

65
Q

Ducting used for ventilation purposes

A

Elephant Trunk

66
Q

Temporary source of limited electrical power used upon the loss of the normal power source

A

Emergency Power

67
Q

The force that causes electricity to flow between two points with different electrical charges or when there is a difference of potential between the two points.

A

EMF (Electromotive Force)

68
Q

The transistor equivalent of the cathode modulator. The gain is varied by changing the voltage on the emitter

A

Emitter-Injection Modulator

69
Q

A synthetic compound of cellulose acetate (wood pulp and magnesium). Used to insulate wire in meters, relays, and motor windings.

A

Enamel

70
Q

Embedded in solid material or enclosed in glass ro metal

A

Encapsulalted

71
Q

A method in which one end of an antenna is connected through a capacitor to the final output stage of a transmitter.

A

End-feed Method

72
Q

An array in which the direction of radiation is parallel to the axis of the array

A

End-Fire Array

73
Q

A table showing the precalculated position of a satellite at any given time

A

Ephemeris

74
Q

The acronym for erasable programmable read-only memory

A

EPROM

75
Q

A resistance that represents the total ohmic values of a circuit component or group of circuit components. usually drawn as a single resistor in a simplified circuit

A

Equivalent Resitance (Req)

76
Q

A process by which a signal recorded on a tape is removed and the tape made ready for rerecording

A

Erasure

77
Q

The name commonly given to the servomotor in a servo system. So named because it reduces the error signal by providing feedback to the error detector.

A

Error Reducer

78
Q
  1. in servosystems, the signal whose amplitude and polarity or phase are used to correct the alignment between the controlling and the controlled elements.
  2. The name given to the electrical output of a control transforemer
A

Error Signal

79
Q

An alloy that changes directly from a solid to a liquid with no plastic or semiliquid state

A

Eutectic Alloy

80
Q

The current that flows in the primary winding of a transformer when the secondary is open-circuited; it produces a magnetic flux field.

A

Exciting Current

AKA magnetizing current

81
Q

A function whose output is a 1 if one and only one of the input variables is a 1

A

Exclusive OR

82
Q

A semiconductor in which impurities have been added to create certain charge carrier concentrations

A

Extrinsic

83
Q

The method for transmitting and receiving still images. These images can be maps, photographs, and handwritten or printed text

A

Facsimile

84
Q

Any of the elements, quantities, or symbols that, when multiplied together, form a product

A

Factor

85
Q

Variations in signal strength by atmospheric conditions

A

Fading

86
Q

The rotation of the plane of polarization of electromagnetic energy when it passes a substance influenced by a magnetic field that has a component in the direction of progagation

A

Faraday Rotation

87
Q

Differentiator circuit in the first video amplifier that allows only the leading edges of target returns, no matter how small or large

A

Fast-Time-Constant Circuit

88
Q

A transmission line that carrier energy to the natenna

A

Feeder

89
Q

A horn radiator used to feed a reflector

A

Feed Horn

90
Q

A powdered and compressed ferric oxide material that has both magnetic properties and light resistance to current flow

A

Ferrite

91
Q

An outer covering used to protect a conductor’s insulating material. Commonly made from cotton, linen, silk, rayon, or fiberglass.

A

Fibrous Braid

92
Q
  1. The faithful reproduction of a signal
  2. The accuracy with which a system reproduces a signal at its otput that faithfully maintains the essential characteristics of the input signal
A

Fidelity

93
Q

A transistor consisting of a source, a gate, and a drain. Current flow is controlled by the transverse electric field under the agate

A

Field Effect Transistor

94
Q

A term used to describe the total force exerted by an action-at-a-distance phenomenon such as gravity upon matter, electric charges acting upon electric charges, and magnetic forces acting upon other magnets or magnetic materials

A

Field of Force

95
Q

A selective network of resistors, capacitors, and inductors that offers comparatively little opposition to certain frequencies, while blocking or attenuating other frequencies

A

Filter

96
Q

The final stage of amplification in a transmitter

A

Final Power Amplifier (FPA)

97
Q

A set of program instructions, a microprogram, permanently stored in a read-only memory.

A

Firmware

98
Q

A device used to discharge the pulse-forming network. A trigger pulse ionize s the air between two contacts to initiate the discharge.

A

Fixed Spark Gap

99
Q

A transmission line that has no standing waves. This line requires no special timing devices to transfer maximum power

A

Flat Line

100
Q

An earlier name for a diode, or a two-electrode vacuum tube used as a detector.

A

Fleming Valve

101
Q

A line made with an inner conductor that consists of flexible wire insulated from the outer conductor by a solid, continuous insulating aterial

A

Flexible Coaxial ine

102
Q

A device having two stable states and two input terminals, each of which corresponds with one of the two states. The circuit remains in either state until caused to change to the other state by application of a voltage pulse. A similar bistable device with an input that allows it to act a s a single-stage binary counter

A

Flip-Flop

103
Q

A graphic represntation of the processing steps (logic_ of a program ( a program flowchart) or the inputs, outputs, and processing steps of a system. The graphic representation uses symbols to represent operations and directional lines to indicate sequence and direction of flow

A

Flowchart

104
Q
  1. In electrical or electromangetic devices, a general term used to designate collectively all the electric or magnetic lines of force in a region
  2. A solution that removes surface oxides from metals being soldered.
A

Flux

105
Q

The ability of a resonant circuit to operate continuously because of stored energy or energy pulses

A

Flywheel effecst

106
Q

The energy band in an atom lying between the conduction band and the valence band. Electrons are never found in the forbidden band but may travel back and forth trough it. The forbidden band determines whether a solid material will act as a conductor, a semi-conductor, or an insulator.

A

Forbidden Band

107
Q

An external voltage that is applied to a PN junction in the conducting direction so that the junction offers only minimum resistance to the flow of current. Conduction is accomplished by majority current carriers (hole in P=type material; electrons in N-type material)

A

Forward Bias

108
Q

The smaller resistance value observed when you are checking the resistance of a semcionductor

A

Forward Resistance

109
Q

A circuit that uses a double-tuned rf transformer to convert frequency variations in tree received fm signal to amplitude variations

A

Foster-Seeley Discriminator

AKA Phase-Shift Discriminator

110
Q

The process of synchroning a facsimile receiver to transmitter. This allows proper picture reproudction.

A

Framing

111
Q

The loss of energy of radio waves caused by the spreading of the wavefront as it travels from the transmitter.

A

Free-Space Loss

112
Q

Circuit modification used to improve or broaden the linearity of its frequency response

A

Frequency Compensation Network

113
Q

The frequency at which the filter circuit changes from an action of rejecting the unwanted frequencies to an action of passing the desired frequencies. Conversely, the point at which the filter circuit changes from an action in which it passes the desired frequencies to an action in which it rejects the undesired frequencies.

A

Frequency Cutoff

114
Q

Refers the the difference between the carrier frequency of an fm signal and the instantaneous frequency of its modulated wave.

A

Frequency Deviation

115
Q
  1. The ability to a component or device to operate over a portion of the frequency spectrum.
    2 In reference to test equipment, that portion of the frequency spectrum that the test equipment is capable of sensing and and measuring accurately
A

Frequency Response

116
Q

A curve showing the output of an amplifier in terms of voltage or current plotted against frequency with a fixed-amplitude input singla

A

Frequency-Response Curve

117
Q

Varying the output frequency to achieve electronic scanning

A

Frequency Scanning

118
Q

Frequency modulation somewhat similar to continuous-wave keying in AM transmitters. The carrier is shifted between two differing frequencies by opening and closing a key

A

Frequency-Shfirt Keying

119
Q

Refers tot he ability of an oscillator to accurately maintain its operating frequency

A

Frequency stability

120
Q

The ratio of the energy radiated in the principal direction compared to the energy radiated in the opposite direction

A

Front-to-back Ratio

121
Q

A circuit that uses the positive and negative alternation s in an alternating current to produce direct current

A

Full-wave Rectifier

122
Q

Consists of tow half-wave voltage rectifiers and is used to reduce the output ripple amplitude

A

Full-wave Voltage Doubler

123
Q

A specific purpose of an entity; its characteristic action

A

Function

124
Q

The basic frequency or first harmonic freuqncy

A

Fundamental Frequency

Comms (2 decks)

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