GLOSSARY - TM-11-5820-670-120087

TM 11-5820-670-12

GLOSSARY

Section I ABBREVIATIONS

ADJ adjust

REFL reflected

RETRAN retransmit

CARR carrier

SQ squelch

DIS disable (squelch)

tp test point

fm frequency modulated

T/R transmit/receive

FWD forward

VOL volume

HI high

XMTR transmitter

LO lOW

Section II DEFINITION OF UNUSUAL TERMS

CONTROL UNIT. A component of the radio set, located remotely from the receiver-transmitter, to

control the modes of operation, set frequencies, and control squelch modes.

FORWARD POWER. The strength of an rf signal from a transmitter radiated by its antenna.

FREQUENCY MODULATION. A type of radio transmission in which the frequency of an rf carrier wave

is varied in accordance with a modulating signal while the amplitude of the carrier wave remains

constant.

IMPEDANCE. The opposition of a circuit to the flow of alternating current, measured in ohms.

INTERCOMMUNICATIONS SYSTEM. A configuration of components installed in a aircraft which

permits communications with distant stations and also between crewmembers within aircraft.

OPERATIONAL CHECK. A test or series of tests of a communication system which checks the per-

formance of the communication system and its components under controlled operating conditions to

determine combat readiness of the system.

REFLECTED POWER. The strength of an incoming rf signal passed by a receiver antenna to the

receiver.

REMOTE CONTROL. The operation of the communication system by remotely located components of

the system.

RETRANSMISSION. The arrangement of two radio sets connected together to provide automatic

retransmission of signals between two radios that are too far apart to communicate directly with each

other.

ROUTING. Path taken by cables to interconnect a communications system within a vehicle.

SIDETONE. The sound of user's own voice heard in earphone or loudspeaker while speaking into

microphone.

SQUELCH. A receiver circuit which automatically turns the sound off when no received signal is

present and turns it on when a received signal is present.

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