A
A
ampere. A unit of measure for electrical current.
ac, AC
alternating current. An electric current that reverses its direction at regularly recurring
intervals.
AC/RF
alternating current radio frequency.
AFC
automatic frequency control. An arrangement whereby the tuning of a circuit is automatically
maintained within specified limits with respect to a reference frequency.
AGC
automatic gain control. A process or means by which gain is automatically adjusted in a
specified manner as a function of input level or other specified parameters.
AMPL
amplitude.
amplifier cascade
two or more amplifiers in a series, the output of one feeding the input of another.
attenuation
The difference between transmitted and received signal strength due to loss through
equipment, lines, or other transmission medium. Usually expressed in decibels.
attenuator
A passive device designed to reduce signal strength without distorting the waveform.
Usually specified in dB.
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