User Manual

MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX Project 1106
Glossary of Terms
30
LSB
Abbreviation for “Least Signicant BIT.”
MSB
Abbreviation for “Most Signicant BIT.”
NAC
Abbreviation for “Network Access Code.”
A twelve bit eld identifying the network of
the radio message. Typically used to steer
repeater functions.
PTT
Abbreviation for “Push-to-Talk”, the switch
on a subscriber unit which, when pressed,
causes the subscriber unit to transmit.
QPSK
Abbreviation for “Quadrature Phase Shift
Keying” modulation technique. PSK using
four phase states.
RF
Abbreviation for “Radio Frequency.”
Signal
The detectable transmitted energy which
carries information from a transmitter to a
receiver.
SINAD
Abbreviation for “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
Abbreviation for “Talk-Group Identier.” A
sixteen bit eld identifying talk-group of the
radio message.
TIA
Abbreviation for “Telecommunications
Industry Association”
Time-Out-Timer
A function that limits the transmission
period to a pre-dened time. The user will
automatically stop transmitting when the
timer goes off after the pre-dened time.
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 articial speech sounds for
reception.