RADIO GLOSSARY

AGC

Automatic Gain Control

A circuit that automatically adjusts the receiver gain to maintain a constant output level regardless of input signal strength.

AM

Amplitude Modulation

A modulation technique where the amplitude of the carrier wave is varied in proportion to the audio signal.

APRS

Automatic Packet Reporting System

A digital communications system used for real-time tactical digital communications of information of immediate value in the local area.

ARRL

American Radio Relay League

The national association for amateur radio in the USA, founded in 1914. Publishes QST magazine and the ARRL Handbook.