AF Audio Frequency; the frequencies between 20 Hz
and 20 kHz in the electromagnetic spectrum
ALC Automatic Level Control
AM Amplitude Modulation; the process of impressing
information on a radio-frequency signal by varying
its amplitude.
Bandwidth The range of frequencies available for signaling.
BCD Binary-Coded Decimal; a digital system that uses
binary codes to represent decimal digits.
BFO Beat Frequency Oscillator
BNC A bayonet locking connector for miniature coax; said
to be short for Bayonet-Neill-Concelman.
Broadband As used in the FM transmitter; refers to the entire
audio spectrum as opposed to the spectrum
influenced by the pre-emphasis; also called
“Wideband”.
Carrier A continuous signal which is modulated with a
second; information– carrying signal.
Crosstalk In FM broadcasting, the term generally refers to the
interaction between the main (L+R) and the
subcarrier (L_R) signals as opposed to “separation”
which generally refers to leakage between left (L)
and right (R) channels.
Density (program) A high average of modulation over time.
Deviation The amount by which the carrier frequency changes
either side of the center frequency.
DIP Dual In-line Pins; term used to describe a pin
arrangement.
Distortion The unwanted changes in signal wave shape that
occur during transmission between two points.
DPM Digital Panel Meter
EPROM Erasable Programmable Read Only Memory
Exciter (1) A circuit that supplies the initial oscillator used in
the driver stage.
(2) A transmitter configuration which excludes
stereo generation and audio processing.
FM30/FM150/FM300 User’s Manual G-2
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