Automatic Frequency Control. Automatically compensate frequency drift
AFSK
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Audio Frequency Shift Keying
AFT
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Automatic Fine Tuning
AGC
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Automatic Gain Control. Automatically optimize receiver amplifier gain
ALC
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Automatic Level Control. Limits RF drive level to power amplifier during transmit to pre-vent distortion
AM
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Amplitude Modulation
ANF
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Automatic Notch Filter
ANL
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Automatic Noise Limiter. Eliminates impulse and static noise peaks
ANSI
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American National Standart Institute
APC
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Automatic Power Control. Current limiting of power amplifier to prevent damage to finals in high SWR conditions
APRS
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Automatic Position Reporting System. In conjunction with a GPS provide position reporting
ASC
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Automatic Squelch Control
ASCII
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American Standard Code for Information Interchange
ATIS
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Automatic Transmitter Information System. Standard fitted for use on some European inland waterways. It automatically transmits the ID number when a speech is over or every 5 min of speech
