Saturday, 4 May 2024, 6:13 PM
Site: edulabs.org academy
Course: Activity Examples (Activity Examples)
Glossary: Electronics (Mike Jaroch)
G
GAIN(1) The ratio between the amount of energy propagated from an antenna that is directional compared to the energy from the same antenna that would be propagated if the antenna were not directional [10]. (2) Any increase in the strength of a signal [18]. |
GAIN-BANDWIDTH PRODUCTThe number that results when the gain of a circuit is multiplied by the bandwidth of that circuit. For an operational amplifier, the gain-bandwidth product for one configuration will always equal the gain-bandwidth product for any other configuration of the same amplifier [8]. |
GALENAA crystalline form of lead sulfide used in early radio receivers [7]. |
GALVANOMETERA meter used to measure small values of current by electromagnetic or electrodynamic means [3] [4] [16]. |
GAMMAThe emitter-to-base current ratio in a common-collector configuration [7]. |
GANGED TUNINGThe process used to tune two or more circuits with a single control [17]. |
GASOne of the three states of matter; it has no fixed form or volume [1]. |
GATEAs applied to logic circuitry, one of several different types of electronic devices that will provide a particular output when specified input conditions are satisfied. Also, a circuit in which a signal switches another signal on or off [13]. |
GATED AGCCircuit that permits automatic gain control to function only during short time intervals [18]. |
GATED-BEAM DETECTORAn FM demodulator that uses a special gated-beam tube to limit, detect, and amplify the received FM signal. Also known as a quadrature detector [12]. |
GATINGThe process of selecting those portions of a wave that exist during one or more selected time intervals or that have magnitudes between selected limits. Also, the application of a specific waveform to perform electronic switching [13]. |
GENERAL PURPOSE ELECTRONIC TEST EQUIPMENTTest equipment that has the capability, without modification, to generate, modify, or measure a range of electronic functions required to test several equipments or systems of basically different designs [14] [16]. |
GENERATORA machine that converts mechanical energy to electrical energy by applying the principle of magnetic induction. A machine that produces ac or dc voltage, depending on the original design [5]. |
GENERATOR ENDSee INPUT END [10]. |
GERMANIUMA grayish-white metal having semiconductor properties [7]. |
GETTERAn alkali metal introduced into a vacuum tube during manufacture. It is fired after the tube has been evacuated to react chemically with (and eliminate) any remaining gases [6]. |
GIMBALA mechanical frame, with two perpendicular intersecting axes of rotation, used to support and furnish a gyro wheel with the necessary freedom to tilt in any direction [15]. |
GLOW DISCHARGEDischarge of electricity through a gas in an electron tube [18]. |
GRAMME-RING ARMATUREAn inefficient type of armature winding in which many of the turns are shielded from the field by its own iron ring [5]. |
GRAPHA pictorial presentation of the relation between two or more variable quantities, such as between an applied voltage and the current it produces in a circuit [1]. |
GRID BIASA constant fixed potential applied between the grid and the cathode of a vacuum tube to establish an operating point [6]. |
GRID CURRENTThe current that flows in the grid-to-cathode circuit of a vacuum tube [6]. |
GRID-GAP TUNINGA method of changing the center frequency of a resonant cavity by physically changing the distance between the cavity grids [11]. |
GRID-LEAK BIASA self-bias provided by a high resistance connected across the grid capacitor or between the grid and cathode [6] |
GROUND(1) The point in a circuit used as a common reference point for measuring purposes. (2) To connect some point of an electrical circuit or some item of electrical equipment to earth or to the conducting medium used in lieu thereof [13]. |
GROUND CLUTTERUnwanted echoes, from surrounding land masses, that appear on a radar indicator [18]. |
GROUND PLANEThe portion of a ground-plane antenna that acts as ground [10]. |
GROUND PLANESCopper planes used to minimize interference between circuits and from external sources [14]. |
GROUND POTENTIALZero potential with respect to the ground or earth [1]. |
GROUND RANGEThe distance on the surface of the earth between a radar and its target. Equal to slant range only if both radar and target are at the same altitude [18]. |
GROUND REFLECTION LOSSThe loss of RF energy each time a radio wave is reflected from the earth's surface [10]. |
GROUND SCREENA series of conductors buried below the surface of the earth and arranged in a radial pattern. Used to reduce losses in the ground [10]. |
GROUND WAVESRadio waves which travel near the surface of the earth [10]. |
GROUND-CONTROLLED APPROACHA radar system used to guide aircraft to safe landings in poor visibility conditions [18]. |
GROUND-PLANE ANTENNAA type of antenna that uses a ground plane as a simulated ground to produce low-angle radiation [10] |
GROUPA collection of units, assemblies, subassemblies, and parts. It is a subdivision of a set or system but is not capable of performing a complete operational function [17]. |
GROUP VELOCITYThe forward progress velocity of a wave front in a waveguide [11]. |
GROWN JUNCTIONA method of mixing P-type and N-type impurities into a single crystal while the crystal is being grown [7]. |
GUIDANCE RADARA system which provides information that is used to guide a missile to a target [18]. |
GYROAbbreviation for gyroscope [15]. |
GYROSCOPEA mechanical device containing a spinning mass mounted so that it can assume any position in space [15]. |