Electronics the ratio of the output signal of an amplifier to the input signal, usually measured in decibels
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A measure of the amplification of an electronic device. If the power input to the device is P 1
and the power output is P 2
, the gain expressed in decibels is given by
G = 10 log10 (P 2 /P 1 )
Gains measured in this way can be added when amplifying stages are connected in series.
A measure of the directional advantage of using one radio antenna
as compared with another. It is usual to express the gain, G
, of a particular antenna over an isotropic radiator. For a lossless antenna it is given by
G = 4πA e /λ2
where A e
is the effective area (see array
) and λ is the wavelength; the gain is equal to the directivity
in this case. Sometimes the comparison is with a dipole
, which itself has a gain over an isotropic radiator of 1.5 (equivalent to 1.7 decibels, or dBi).
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The increase in signal power that is produced by an amplifier; usually given as the ratio of output to input voltage, current, or power, expressed in decibels. Also known as transmission gain.
A cavity in a piece of wood prepared by notching or mortising so that a hinge or other hardware or another piece of wood can be placed on the cavity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An increase in signal power or voltage produced by an amplifier in transmitting a signal from one point to another. The amount of gain is usually expressed in decibels above a reference level. See Amplifier
Antenna gain is a measure of the effectiveness of a directional antenna as compared to a nondirectional antenna. See Antenna (electromagnetism)
McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
In carpentry, a groove or notch in one piece into which another piece is fitted.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
i. The amplification obtained in a radio circuit or a component of the circuit. It is measured as a direct ratio or logarithmically. In radar, there are two general usages of the term: (a) antenna gain, or a gain factor, is the ratio of the power transmitted along the beam axis to that of an isotropic radiator transmitting the same total power; and (b) receiver gain, or video gain, measures how much a receiver amplifies an incoming signal.
ii. A general term for the increase in signal power after transmission from one point to another. Gain is usually expressed in decibels and is widely used to denote transducer gain.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
gainThe amount of increase that an amplifier provides on the output side of the circuit.
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