# gain

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## gain

Electronics the ratio of the output signal of an amplifier to the input signal, usually measured in decibels

## gain

1. 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.

2. 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 e2
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).

## gain

[gān]
(electronics)
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.
(electromagnetism)
(engineering)
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.

## Gain

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)

## gain

gain joint
In carpentry, a groove or notch in one piece into which another piece is fitted.

## gain

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.

## gain

The amount of increase that an amplifier provides on the output side of the circuit.
References in classic literature ?
The power which is to be the gainer," he said quietly, " is the power encompassed by these walls,"
Simon has no property of his own save the small estate of Birchmoor, it is obvious that the Californian heiress is not the only gainer by an alliance which will enable her to make the easy and common transition from a Republican lady to a British peeress.
The community is certainly the gainer, and no one the loser, save the poor out-of-work specialist, whose occupation has gone.
Should I be the gainer or the loser by the resemblance which he fancied he had discovered?
If we could obtain permission from the Municipal Council to make a hard road, so as to put us in communication with the highway to Grenoble, the deputy-mayor would be the first gainer by it; for instead of dragging his timber over rough tracks at a great expense, a good road through the canton would enable him to transport it more easily, and to engage in a traffic on a large scale, in all kinds of wood, that would bring in money--not a miserable six hundred francs a year, but handsome sums which would mean a certain fortune for him some day.
However, I should never have broken a horse or bull and taken him to board for any work he might do for me, for fear I should become a horseman or a herdsman merely; and if society seems to be the gainer by so doing, are we certain that what is one man's gain is not another's loss, and that the stable-boy has equal cause with his master to be satisfied?
Who can imagine that a man who sold his son or daughter into slavery for money, especially if he sold them into the hands of fierce and evil men, would be the gainer, however large might be the sum which he received?
When opposition gets fairly into the councils of a tribe, it is rarely that humanity is the gainer.
Damac Properties led the top gainers list as its share price jumped by more than eight per cent to Dh2.
16, 2014 /PRNewswire/ -- As 2014 comes to a close, Wealth-X reveals this year's biggest financial gainers and losers.
Real estate and energy sector stocks were the biggest gainers.
These individuals were categorized according to relative weight changes: weight losers, weight gainers, and weight maintainers.

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