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AFC
Automatic Frequency Control

Used in FM receivers to prevent drifting off the received station's frequency.
AFSK
Audio Frequency Shift Keying
AGC
Automatic Gain Control

A feedback voltage in the receiver circuit to prevent fading of a received signal
ALC
Automatic Level Control

A feedback voltage in the transmitter's output amplifier used to prevent amplifier overload. Also used as feedback from a linear amplifier back to the exciter to prevent overdriving.

AM
Amplitude Modulation
AMTOR
AMateur Teletype Over Radio

An advanced form of RTTY usually operated on the HF bands.
Analog
A signal that varies in a continuous manner as a wave as opposed to a discrete signal such as digital
Antenna Tuner
Impedance-matching device that matches the impedance of the antenna system input to the transmitter, receiver, or transceiver output impedance
Antenna
A device that intercepts or radiates radio frequency energy
APRS
Automatic Packet Position Reporting System
ARES
Amateur Radio Emergency Service
ARRL
American Radio Relay League , the national amateur radio organization in the USA
ASCII
American Standard Code for Information Interchange. A seven bit code established by ANSI to achieve compatibility between digital devices
Balun
Balanced to unbalanced.

A device used to couple a balanced antenna to an unbalanced feed line (e.g., dipole to coax)
Band
A range of frequencies allotted for a particular use (e.g., 20 Meter Band)
Bandpass
Range of frequencies permitted to pass through a filter or receiver circuit
Band-Pass Filter
A circuit that passes a range of frequencies and attenuates signals above and below this range
Barefoot
Transmitting with a transceiver alone without a linear amplifier
Base
A radio station located at a fixed location as opposed to a mobile.

Used to identify the control location in a network of radio stations.
Baud
A unit of signaling speed equal to the number of discrete signal events per second. Baud is the same as BPS only if each signal event represents exactly one bit.
Baudot
A five level code for the transmission of data in digital form
BBS
Bulletin Board System.

An automated computer system which can be controlled from a remote location. Usually capable of sending and receiving messages and files.
Beacon
A station that transmits one-way signals for the purpose of navigation, homing, and determining propagation conditions
Beam
An antenna that gives a directional beam pattern.

Also called a Yagi.
BNC
Coax connector commonly used with VHF/UHF equipment -- Bayonet Niell-Concelman (standard connector type used on COAX cable, named for its inventors).
BPS
Bits per second.

A rate of data transfer.
BPSK
Binary Phase Shift Keying.

Digital DSB suppressed carrier modulation
Bug
A semi-automatic mechanical code key.
Bureau
International Amateur organizations set up to process QSL cards between countries. Provides an inexpensive way to send and receive QSL cards.
Burro
Slang for bureau.
Call Book
A publication or CD ROM that lists licensed amateur radio operators
Calling Frequency
A standard frequency where stations attempt to contact each other. Example -- 146.52 is the North American FM simplex calling frequency.
Carrier
A pure continuous radio emission at a fixed frequency, without modulation and without interruption.

Several types of modulation can be applied to the carrier, See AM and FM.
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