# 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 periodicals archive ?
The battle to join Nibali on the podium intensified, three riders separated by 15 seconds with one final bid to gain time in tomorrow's penultimate day time-trial.
Sulaiman added in a speech at the sit-in yard northern Ramadi today that Maliki is trying as much as possible to gain time resorting to flimsy pretexts in order to hit the protesters in Ramadi, depending on those who sold themselves.
Syria: Saudi Foreign Minister Prince Saud al-Faisal accused Syria s President Bashar al-Assad of "manoeuvring" to gain time, at a joint news conference Sunday with UN chief Ban Ki-moon.
A) -- Turkish Foreign Minister Ahmet Davutoglu said Tuesday that the speech delivered by Syrian President Bashar al-Assad to the Syrian nation was full of accusations and was designed to gain time.
A leading opposition figure accused the embattled regime of President Saleh of trying to gain time.
Syria has rejected previous Arab initiatives, and it was not clear if this would be different, or if the regime was trying to gain time to try to crush the uprising.
I throw the dice to gain time I have to lose you must peek through your
If he's feeling super and Alberto [Contador] attacks and he goes with him, he won't throw away an opportunity to gain time on rivals.
AaAaAa For is part member of PAM's national bureau, Fouad Ali El Himma, said that the party seeks to send from LaEoyoune a clear message to the whole world, notably to the Algerian leaders, to make them understand that the autonomy initiative was not designed to gain time, as they claim, but it is a serious proposal that stems from Morocco's genuine will to settle, once and for all, the Sahara issue.
Lufthansa said it has filed a petition with the Austrian Takeover Commission for an extension of the deadline on the AUA deal to 31 August from the initial 31 July, hoping to gain time to comply with the antitrust requirements.
The government filibustered to gain time, then opted to halt Knesset vote on the Land Privatization Bill when it appeared the law would founder.
He said the government had not been serious to implement the confidence building agreement and its delegation seeks to gain time.

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