ABSTRACT
Gain Level: 2 Definition: (1) In RF communications, gain refers to the amount of increase in the strength of a signal after being passed through a signal amplifier. This increase in signal strength is frequently measured in decibels (dB). (2) Gain is also a measure of the amount of signal delivered by an antenna relative or compared to a reference antenna. (3) Less commonly, the ability of sophisticated digital algorithms and signal processors that receive specially modulated signals to increase effectively the desired-to-undesired signal ratio, which results in processing gain. (4) Gain is also used to measure the reflectivity of a projection screen, with a “high-gain” screen reflecting more light at right angles (which makes the image brighter for viewers in the center of the viewing area but dimmer for those looking from a wide angle).
