Electronics (Mike Jaroch)

(1) A small ac or dc generator, sometimes referred to as a rate generator, that converts its shaft speed into an electrical output. The tachometer is frequently used in servosystems to sense the velocity of a load [15]. (2) An instrument that measures the rate at which a shaft is turning [16].

A tuned circuit used to temporarily store energy. Also referred to as a parallel-resonant circuit [9].

A wire-wound, fixed resistor having one or more additional terminals along its
length, generally for voltage-divider applications [1].

In radar, a specific object of radar search or detection [18].

The ability of a radar to distinguish between two or more targets that are close
to each other [18].

The transmission, emission, or reception of signs, signals, writings, images, or sounds. This is done by visual, oral, wire, radio, or other means [17].

A machine that can transmit and/or receive letters, numbers, or symbols. It may
have a keyboard similar to a typewriter [17].

The amount of change of resistance in a material per unit change in temperature [1] [4].

The condition in which warm air is formed above a layer of cool air that
is near the earth's surface [10].

A term normally used to describe compromising emanations. These emanations are unintentionally radiated signals that could disclose classified information [17].

The greatest stress a substance can withstand along its length without tearing
apart [4].

An electrical connection [1] [4].

Also called a terminal strip. An insulating base or slab equipped with terminals for connecting wiring [4].

A diagram of a switch, relay, terminal board, or other component showing the
connections to the equipment [4].

A device attached to a conductor to permit connection to a terminal [4].

A general term applied to devices used to test electrical and electronic circuits [3].

The Navy guide used to assist in identifying portable electrical/ electronic
test equipment required for support of prime electrical/electronic, IC, weapons, and reactor instrumentation systems [16].

Locations in equipment that are accessible to the technician's test probes where operating voltages or signals can be monitored [16].

A four-electrode electron tube containing a plate, a cathode, a control grid, and a screen grid [6].

The capacity of a soldering iron to generate and maintain a satisfactory soldering temperature while giving up heat to the material being soldered [4].

A conduction that exists when heat causes more electron-hole pairs to be
generated, which, in turn, causes more heat and which may eventually cause diode destruction [7].

A circuit breaker trip element that uses the increased bending of a
bimetallic strip caused by increased current to open a circuit [3].

A single circuit breaker trip element that combines the action of a thermal and a magnetic trip element [3].

Emission of electrons from a solid body as a result of elevated temperature [6].

(1) A semiconductor device whose resistance varies with temperature [4]. (2) A type of bolometer characterized by a decrease in resistance as the dissipated power increases [16].

A junction of two dissimilar metals that produces a voltage when heated [1].

A meter movement that uses the current induced in a thermocouple by the heating of a resistive element to measure the current in a circuit; used to measure ac or dc [3].

A synthetic mixture of rosins that is flexible and used as an insulting material.
Generally used as an insulator for low- and medium-range voltages [4].

The Greek letter (θ) used to represent phase angle [2].

Passive circuit components (resistors and capacitors) having a thickness of 0.001 centimeter [14].

Passive circuit elements (resistors and capacitors) deposited on a substrate
to a thickness of 0.0001 centimeter [14].

(3D)—A radar set that measures the range, bearing and altitudes of a target [18].

An array with two parasitic elements (reflector and director) and a driven
element [10].

In a switch, the number of different circuits each pole can control; for example, single throw and double throw [3].

A gas tube used as a modulator switching device [18].

A gas-filled triode in which a sufficiently large positive pulse applied to the
control grid ionizes the gas and causes the tube to conduct, after which the control grid has no effect in conduction [6] [12].

A small coil connected in series with the collector or plate circuit of a transistor or tube and inductively coupled to the base or grid-circuit coil to establish feedback (regeneration) [9].

Time required for an exponential quantity to change by an amount equal to 63.2 percent of the total change that can occur [2] [9].

The delay in a servosystem between the application of the input signal and the actual movement of the load [15].

The process that periodically samples the full 360 degrees of each sine wave. The sample can be of a received signal or of a signal to be transmitted [17].

See SYNCHRONIZER [18].

The process of applying a thin coat of solder to materials prior to their being soldered; for example, application of a light coat of solder to the filaments of a conductor to hold the filaments in place prior to soldering of the conductor [4].

(1) The maximum permissible error or variation from the standard in a measuring instrument. (2) A maximum electrical or mechanical variation of specifications that can be tolerated without impairing the operation of a device [1].

Equipment that converts TTY dc pulses into audio tones for modulation of a
transmitter in audio-frequency-tone shift transmissions [17].

Musical sounds [10].

An antenna that is center-fed and capacitively loaded [17].

A measure of how much load a machine can turn. This measurement is expressed either in ounce-inches for torque synchro systems or in pound-feet for heavy machinery [15].

(TDR)—A type of differential synchro that takes two electrical inputs, one to the rotor and one to the stator, and produces a mechanical output. The output is the angular position of the rotor that represents the algebraic sum or difference of the two electrical inputs [15].

A synchro system containing either a TDX or a TDR. This system is used in applications where it is necessary to compare two signals, add or subtract
the signals, and furnish an output proportional to the sum or difference between the two signals [15].

(TDX)—This type of synchro is functionally the same as the CDX, except that it is used in torque systems rather than control systems [15].

A term used in the rating of torque synchros. It is expressed in the number of
inch-ounces of torque required to pull a specific synchro 1 degree away from its normal position; for example, 0.4 inch-ounce per degree [15].

(TR)—A type of synchro that converts the electrical input supplied to its stator
back to a mechanical angular output through the movement of its rotor [15].

A synchro system that uses torque synchros to move light loads such as dials, pointers, and other similar devices [15].

(TX)—This type of synchro is functionally the same as the CX, except that it
is used in torque synchro systems [15].

In a gyro, a vector representing the rotary motion applied to change the direction of the rotor axis. The torque vector represents the axis about which the applied force is felt [15].

(RT) The equivalent resistance of an entire circuit. For a series circuit: RT = R1 + R2 + R3 ...Rn. For parallel circuits:

Vapors emitted by a substance that can do bodily harm [4].

Time required for a fired tr or atr tube to deionize to a normal level of
conductance [18].

Operational phase of a fire-control or track radar during which the radar beam is kept on the target [18].

Radar that provides continuous range, bearing, and elevation data by keeping the RF beam on the target [18].

Transconductance is a ratio of the change in plate current to a change in grid
voltage with the plate voltage held constant. Transconductance (gm) is usually expressed in micromhos or millimhos.

A device composed of two or more coils, linked by magnetic lines of force, used to transfer energy from one circuit to another.

STEP-DOWN—A transformer so constructed that the number of turns in the
secondary winding is less than the number of turns in the primary winding. This construction will
provide less voltage in the secondary circuit than in the primary circuit [2].

STEP-UP—A transformer so constructed that the number of turns in the secondary winding is more than the number of turns in the primary winding. This construction will provide more voltage in the secondary circuit than in the primary circuit [2].

The ratio of output power to input power, generally expressed as a
percentage.

A semiconductor device with three or more elements [7].

The time an electron takes to cross the distance between the cathode and the plate [6] [11].

The time it takes to shift from a mark to a space condition or from a space to a mark condition [17].

In a gyro, a force acting through the center of gravity of the gyro that causes no torque on the gyro rotor. Translation forces do not change the angle of the plane of rotation but move the gyroscope as a unit [15].

Those substances, such as frosted glass, through which some light rays can pass but through which objects cannot be seen clearly [10].

A device designed to guide electrical or electromagnetic energy from one point
to another [10].

A means of transferring intelligence from point to point; includes light, smoke, sound, wire lines, and radio-frequency waves [10] [12].

(TR)—A gas-filled RF switch that is used as a duplexer [18].

Equipment that generates and amplifies an RF carrier, modulates the RF carrier with intelligence, and radiates the signal into space [17] [18].

A device that reads Baudot code from paper tape and allows a message to be printed on a page printer [17].

See INPUT END [10].

(CARRIER FREQUENCY)—The frequency of the unmodulated output of a transmitter [18].

Equipment that selectively transfers remote station functions and signals to transmitters [17].

The device used to send the transmitted signal energy into space [10].

Those substances, such as glass, that pass almost all of the light waves falling upon them [10].

A waveguide mode in which the entire electric field is perpendicular to the wide dimension and the magnetic field is parallel to the length. Also called the TE mode [11].

A waveguide mode in which the entire magnetic field is perpendicular to the wide dimension and some portion of the electric field is parallel to the length. Also called the TM mode [11].

The up and down motion of a wave as the wave moves outward [10].

(BEARING) SIGNAL—In a monopulse radar system, the combination of individual lobe signals that represents target-offset direction and amplitude from the antenna axis [18].

The band of frequencies from 300 gigahertz to 3,000 gigahertz.

A three-terminal device that is similar to two SCRs back to back with a common gate and common terminals. Although similar in construction and operation to the SCR, the triac controls and conducts current flow during both alternations of an ac cycle [7].

A special type of monopole antenna array [17].

A short pulse, either positive or negative, that can be used to cause an electronic function to take place [9].

See SYNCHRONIZER [18].

In radar, pulses that are used to initiate specific events [18].

A three-electrode electron tube containing a plate, a cathode, and a control grid [6].

The part of a circuit breaker that senses any overload condition and causes the circuit breaker to open the circuit [3].

A circuit breaker that will open a circuit even if the operating mechanism is held in the ON position [3].

Acceptor impurities containing only three valence electrons [7].

The portion of the atmosphere, closest to the earth's surface, where all weather phenomena take place [10].

The propagation of radio waves in the troposphere by means of scatter [10].

Signal lights used to aid maintenance personnel in locating troubles quickly
[15].

Tables of trouble symptoms and probable causes, furnished by many manufacturers to help technicians isolate problems [15].

The process of locating and diagnosing faults in equipment by means of
systematic checking or analysis [3] [15] [16].

(BOTTOM)—The peak of the negative alternation (maximum value below the line) of a sine wave [10].

Angle between a target and true north measured clockwise in the horizontal plane [18].

Geographic north [18].

The power dissipated in the resistance of the circuit, or the power actually used in the circuit [2].

A paraboloid reflector that has been cut away at the top and bottom to
increase beam width in the vertical plane [18].

A table that describes a logic function by listing all possible combinations of input values and indicating, for each combination, the true output values [13].

Refers to the testing condition in which a vacuum tube is actually performing its function [16].

Refers to the testing condition in which a tube has certain voltages applied
but is not in its normal operating condition [16].

(1) A circuit consisting of inductance and capacitance that can be adjusted for
resonance at a desired frequency [9]. (2) A circuit that is used as a filter which passes or rejects specific frequecies [16]. (3) An LC circuit used as a frequency-determining device [8].

Another name for the resonant line. This line uses tuning devices to eliminate the reactance and transfer maximum power from the source to the line [10].

A heavily doped semiconductor device that has high gain and fast switching
capabilities [7]. See NEGATIVE-RESISTANCE ELEMENT [11].

The piercing of a potential barrier in a semiconductor by a particle (current carrier) that does not have sufficient energy to go over the barrier [11].

One complete loop of a conductor about a core [2].

The ratio of the number of turns in the primary winding to the number of turns in the secondary winding of a transformer [2].

A type of antenna used in vhf communications that is omnidirectional and
consists of two horizontal half-wave antennas mounted at right angles to each other in the horizontal plane [10].

A line consisting of two insulated wires twisted together to form a flexible line without the use of spacers [10].

(2D)—Measures the range and bearing to a target [18].

(2M)—Miniature/microminiature repair program [14].

A parallel line consisting of two wires that are generally spaced from 2 to 6
inches apart by insulating spacers [10].

(TWIN LEAD)—A parallel two-wire line in which uniform spacing is assured by
two wires imbedded in a low-loss dielectric [10].