signal strength

signal strength
In radio, a measure of the received radio frequency power, generally expressed in decibels relative to some standard value. Normally, it is either 1 milliwatt or that power which would have resulted at the same distance under free-space transmission. The normal measure for signal strength in voice communications is 1 to 5; 5 is the strongest, as in “receiving you strength 5.” Also called field strength.

Aviation dictionary. 2014.

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