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|  TM 11-5820-670-30
GLOSSARY
Section 1 ABBREVIATIONS
Audio frequency
af
Automatic frequency control
afc
Automatic gain control
agc
Amplitude modulation
am
crs
Crystal reference system
Frequency modulation
fm
Intermediate frequency
if.
Kilohertz
kHz
MHz
Megahertz
rec
Receive
rf
Radio frequency
rt
Radio-transmitter
Transmit
xmit
Section II DEFINITION OF UNUSUAL TERMS
Attenuate. To reduce signal strength.
Automatic frequency control (aft). A system that produces an error voltage which is proportional to
the amount of oscillator drift. The error voltage corrects this drift.
Automatic gain control (age). A system that automatically adjusts the gain of a signal so as to
produce a constant level of output power.
Drift. The action of an oscillator whose output frequency varies, even though circuit conditions remain
the same.
Limiting. Clipping those portions of a wave that exceed a specific amplitude.
Squelch. To quiet a receiver by cutting off its output when no signal is being received.
Glossary 1/(Glossary 2 blank)
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