Codan Radio Communications UT-4E900 User Manual

MT-4E VHF & UHF Receiver & Transmitter Instruction Manual

IM08-MT-4E-TXRX-P1162

Glossary of Terms

Modulation 

A controlled variation of any property of a 

carrier wave for the purpose of transferring 

information.

MSB 

Most Significant BIT.

NAC 

Network Access Code. A 12-bit field 

identifying the network of the radio message. 

Typically used to steer repeater functions.

PTT 

Push-to-Talk – the switch on a subscriber 

unit which, when pressed, causes the 

subscriber unit to transmit.

QPSK 

Quadrature Phase Shift Keying – modulation 

technique. PSK using four-phase states.

RF 

Radio Frequency.

Signal 

The detectable transmitted energy which 

carries information from a transmitter to a 

receiver.

SINAD 

SIgnal-plus-Noise-and-Distortion to 

noise-and-distortion ratio.

Squelch 

A radio circuit that eliminates noise from 

the speaker when no transmitted signal 

is present.

Subscriber Unit 

A mobile or portable radio unit used in a 

radio system.

TGID 

Talk Group Identifier. A 16-bit field 

identifying the talk group of the radio 

message.

TIA 

Telecommunications Industry 

Association.

Time-Out Timer 

A function that limits the transmission 

period to a pre-defined time. The user 

will automatically stop transmitting when 

the timer goes off after the pre-defined 

time.

Trunked (System) 

Systems with full-feature sets in which 

all aspects of radio operation—including 

RF channel selection and access—are 

centrally managed.

UCM 

Universal Cryptographic Module

UDB 

Universal Daughter Board

VOCODER (Voice-Coder) 

A type of voice coder. Usually 

consisting of a speech analyzer and 

a speech synthesizer which convert 

analog speech into digital signals 

for transmission and digital signals 

back into artificial speech sounds for 

reception.