Electronics (Mike Jaroch)
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TANK CIRCUITA tuned circuit used to temporarily store energy. Also referred to as a parallel-resonant circuit [9]. | ||
TAPPED RESISTORA wire-wound, fixed resistor having one or more additional terminals along its length, generally for voltage-divider applications [1]. | ||
TARGETIn radar, a specific object of radar search or detection [18]. | ||
TARGET RESOLUTIONThe ability of a radar to distinguish between two or more targets that are close to each other [18]. | ||
TELECOMMUNICATIONSThe transmission, emission, or reception of signs, signals, writings, images, or sounds. This is done by visual, oral, wire, radio, or other means [17]. | ||
TELETYPEWRITERA machine that can transmit and/or receive letters, numbers, or symbols. It may have a keyboard similar to a typewriter [17]. | ||
TEMPERATURE COEFFICIENTThe amount of change of resistance in a material per unit change in temperature [1] [4]. | ||
TEMPERATURE INVERSIONThe condition in which warm air is formed above a layer of cool air that is near the earth's surface [10]. | ||
TEMPESTA term normally used to describe compromising emanations. These emanations are unintentionally radiated signals that could disclose classified information [17]. | ||
TENSILE STRENGTHThe greatest stress a substance can withstand along its length without tearing apart [4]. | ||
TERMINALAn electrical connection [1] [4]. | ||
TERMINAL BOARDAlso called a terminal strip. An insulating base or slab equipped with terminals for connecting wiring [4]. | ||
TERMINAL DIAGRAMA diagram of a switch, relay, terminal board, or other component showing the connections to the equipment [4]. | ||
TERMINAL LUGA device attached to a conductor to permit connection to a terminal [4]. | ||
TEST EQUIPMENTA general term applied to devices used to test electrical and electronic circuits [3]. | ||
TEST EQUIPMENT INDEXThe 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]. | ||
TEST POINTSLocations in equipment that are accessible to the technician's test probes where operating voltages or signals can be monitored [16]. | ||
TETRODE TUBEA four-electrode electron tube containing a plate, a cathode, a control grid, and a screen grid [6]. | ||
THERMAL INERTIAThe capacity of a soldering iron to generate and maintain a satisfactory soldering temperature while giving up heat to the material being soldered [4]. | ||
THERMAL RUNAWAYA 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]. | ||
THERMAL TRIP ELEMENTA circuit breaker trip element that uses the increased bending of a bimetallic strip caused by increased current to open a circuit [3]. | ||
THERMAL-MAGNETIC TRIP ELEMENTA single circuit breaker trip element that combines the action of a thermal and a magnetic trip element [3]. | ||
THERMIONIC EMISSIONEmission of electrons from a solid body as a result of elevated temperature [6]. | ||
THERMISTOR(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]. | ||
THERMOCOUPLEA junction of two dissimilar metals that produces a voltage when heated [1]. | ||
THERMOCOUPLE METER MOVEMENTA 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]. | ||
THERMOPLASTICA 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]. | ||
THETAThe Greek letter (θ) used to represent phase angle [2]. | ||
THICK FILM COMPONENTSPassive circuit components (resistors and capacitors) having a thickness of 0.001 centimeter [14]. | ||
THIN FILM COMPONENTSPassive circuit elements (resistors and capacitors) deposited on a substrate to a thickness of 0.0001 centimeter [14]. | ||
THREE-DIMENSIONAL RADAR(3D)—A radar set that measures the range, bearing and altitudes of a target [18]. | ||
THREE-ELEMENT ARRAYAn array with two parasitic elements (reflector and director) and a driven element [10]. | ||
THROWIn a switch, the number of different circuits each pole can control; for example, single throw and double throw [3]. | ||
THYRATRONA gas tube used as a modulator switching device [18]. | ||
THYRATRON TUBEA 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]. | ||
TICKLER COILA 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 CONSTANTTime required for an exponential quantity to change by an amount equal to 63.2 percent of the total change that can occur [2] [9]. | ||
TIME LAGThe delay in a servosystem between the application of the input signal and the actual movement of the load [15]. | ||
TIME-DIVISION MULTIPLEXINGThe 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]. | ||
TIMERSee SYNCHRONIZER [18]. | ||
TINNINGThe 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]. | ||
TOLERANCE(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]. | ||
TONE-TERMINAL SETEquipment that converts TTY dc pulses into audio tones for modulation of a transmitter in audio-frequency-tone shift transmissions [17]. | ||
TONESMusical sounds [10]. | ||
TOP-HATAn antenna that is center-fed and capacitively loaded [17]. | ||
TORQUEA 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]. | ||
TORQUE DIFFERENTIAL RECEIVER(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]. | ||
TORQUE DIFFERENTIAL SYNCHRO SYSTEMA 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]. | ||
TORQUE DIFFERENTIAL TRANSMITTER(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]. | ||
TORQUE GRADIENTA 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]. | ||
TORQUE RECEIVER(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]. | ||
TORQUE SYNCHRO SYSTEMA synchro system that uses torque synchros to move light loads such as dials, pointers, and other similar devices [15]. | ||
TORQUE TRANSMITTER(TX)—This type of synchro is functionally the same as the CX, except that it is used in torque synchro systems [15]. | ||
TORQUE VECTORIn 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]. | ||
TOTAL RESISTANCE(RT) The equivalent resistance of an entire circuit. For a series circuit: RT = R1 + R2 + R3 ...Rn. For parallel circuits: | ||
TOXIC VAPORSVapors emitted by a substance that can do bodily harm [4]. | ||
TR RECOVERY TIMETime required for a fired tr or atr tube to deionize to a normal level of conductance [18]. | ||
TRACKOperational phase of a fire-control or track radar during which the radar beam is kept on the target [18]. | ||
TRACK RADARRadar that provides continuous range, bearing, and elevation data by keeping the RF beam on the target [18]. | ||
TRANSCONDUCTANCETransconductance 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. | ||
TRANSFORMERA 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]. | ||
TRANSFORMER EFFICIENCYThe ratio of output power to input power, generally expressed as a percentage. | ||
TRANSISTORA semiconductor device with three or more elements [7]. | ||
TRANSIT TIMEThe time an electron takes to cross the distance between the cathode and the plate [6] [11]. | ||
TRANSITIONThe time it takes to shift from a mark to a space condition or from a space to a mark condition [17]. | ||
TRANSLATIONIn 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]. | ||
TRANSLUCENTThose substances, such as frosted glass, through which some light rays can pass but through which objects cannot be seen clearly [10]. | ||
TRANSMISSION LINEA device designed to guide electrical or electromagnetic energy from one point to another [10]. | ||
TRANSMISSION MEDIUMA means of transferring intelligence from point to point; includes light, smoke, sound, wire lines, and radio-frequency waves [10] [12]. | ||
TRANSMIT-RECEIVE TUBE(TR)—A gas-filled RF switch that is used as a duplexer [18]. | ||
TRANSMITTEREquipment that generates and amplifies an RF carrier, modulates the RF carrier with intelligence, and radiates the signal into space [17] [18]. | ||
TRANSMITTER DISTRIBUTORA device that reads Baudot code from paper tape and allows a message to be printed on a page printer [17]. | ||
TRANSMITTER ENDSee INPUT END [10]. | ||
TRANSMITTER FREQUENCY(CARRIER FREQUENCY)—The frequency of the unmodulated output of a transmitter [18]. | ||
TRANSMITTER TRANSFER SWITCHBOARDEquipment that selectively transfers remote station functions and signals to transmitters [17]. | ||
TRANSMITTING ANTENNAThe device used to send the transmitted signal energy into space [10]. | ||
TRANSPARENTThose substances, such as glass, that pass almost all of the light waves falling upon them [10]. | ||
TRANSVERSE ELECTRIC MODEA 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]. | ||
TRANSVERSE MAGNETIC MODEA 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]. | ||
TRANSVERSE WAVE MOTIONThe up and down motion of a wave as the wave moves outward [10]. | ||
TRAVERSE SIGNAL(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]. | ||
TREMENDOUSLY HIGH FREQUENCYThe band of frequencies from 300 gigahertz to 3,000 gigahertz. | ||
TRIACA 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]. | ||
TRIATICA special type of monopole antenna array [17]. | ||
TRIGGERA short pulse, either positive or negative, that can be used to cause an electronic function to take place [9]. | ||
TRIGGER GENERATORSee SYNCHRONIZER [18]. | ||
TRIGGER PULSESIn radar, pulses that are used to initiate specific events [18]. | ||
TRIODE TUBEA three-electrode electron tube containing a plate, a cathode, and a control grid [6]. | ||
TRIP-ELEMENTThe part of a circuit breaker that senses any overload condition and causes the circuit breaker to open the circuit [3]. | ||
TRIP-FREE CIRCUIT BREAKERA circuit breaker that will open a circuit even if the operating mechanism is held in the ON position [3]. | ||
TRIVALENT IMPURITYAcceptor impurities containing only three valence electrons [7]. | ||
TROPOSPHEREThe portion of the atmosphere, closest to the earth's surface, where all weather phenomena take place [10]. | ||
TROPOSPHERIC SCATTERThe propagation of radio waves in the troposphere by means of scatter [10]. | ||
TROUBLE INDICATORSSignal lights used to aid maintenance personnel in locating troubles quickly [15]. | ||
TROUBLE TABLESTables of trouble symptoms and probable causes, furnished by many manufacturers to help technicians isolate problems [15]. | ||
TROUBLESHOOTINGThe process of locating and diagnosing faults in equipment by means of systematic checking or analysis [3] [15] [16]. | ||
TROUGH(BOTTOM)—The peak of the negative alternation (maximum value below the line) of a sine wave [10]. | ||
TRUE BEARINGAngle between a target and true north measured clockwise in the horizontal plane [18]. | ||
TRUE NORTHGeographic north [18]. | ||
TRUE POWERThe power dissipated in the resistance of the circuit, or the power actually used in the circuit [2]. | ||
TRUNCATED PARABOLOIDA paraboloid reflector that has been cut away at the top and bottom to increase beam width in the vertical plane [18]. | ||
TRUTH TABLEA table that describes a logic function by listing all possible combinations of input values and indicating, for each combination, the true output values [13]. | ||
TUBE DYNAMIC CONDITIONRefers to the testing condition in which a vacuum tube is actually performing its function [16]. | ||
TUBE STATIC CONDITIONRefers to the testing condition in which a tube has certain voltages applied but is not in its normal operating condition [16]. | ||
TUNED CIRCUIT(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]. | ||
TUNED LINEAnother 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]. | ||
TUNNEL DIODEA heavily doped semiconductor device that has high gain and fast switching capabilities [7]. See NEGATIVE-RESISTANCE ELEMENT [11]. | ||
TUNNELINGThe 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]. | ||
TURNOne complete loop of a conductor about a core [2]. | ||
TURNS RATIOThe ratio of the number of turns in the primary winding to the number of turns in the secondary winding of a transformer [2]. | ||
TURNSTILE ANTENNAA 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]. | ||
TWISTED PAIRA line consisting of two insulated wires twisted together to form a flexible line without the use of spacers [10]. | ||
TWO-DIMENSIONAL RADAR(2D)—Measures the range and bearing to a target [18]. | ||
TWO-M(2M)—Miniature/microminiature repair program [14]. | ||
TWO-WIRE OPEN LINEA parallel line consisting of two wires that are generally spaced from 2 to 6 inches apart by insulating spacers [10]. | ||
TWO-WIRE RIBBON(TWIN LEAD)—A parallel two-wire line in which uniform spacing is assured by two wires imbedded in a low-loss dielectric [10]. | ||