User Manual

MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX Project 1106
29
GLOSSARY OF TERMS
AMBE+2™
Abbreviation for “Advanced Multi Band
Excitation”.
Bandwidth
The difference between the limiting
frequencies of a continuous frequency band.
Typically measured in Kilohertz. May be
considered the amount in kilohertz required
for a single communications channel.
BER
Abbreviation for “BIT Error Rate”
BPS
Abbreviation for BITs Per Second, a data
rate measure.
C4FM
The acronym for a 4-ary FM transmitter
which uses QPSK modulation to work with a
CFDD compatible receiver.
Channel
A single unidirectional or bidirectional path
for transmitting or receiving, or both, of
electrical or electromagnetic signals.
Channel Spacing
Typically measured in kilohertz from the
center of one channel to the center of the
next-adjacent-channel. May, or may not, be
identical to bandwidth.
Common Air Interface (CAI)
A radio to radio signal path dened in terms
of Access Method, Modulation Scheme,
Vocoding Method, Channel Data Rate and
Channel Data Format.
CTCSS
Abbreviation for “Continuous Tone-Controlled
Squelch System”.
DCS
Abbreviation for “Digital Coded Squelch”.
DSP
Abbreviation for “Digital Signal Processor” a
specialized microcomputer.
DTMF
Abbreviation for “Dual-Tone Multi-Frequency”
- a signaling scheme used by the telephone
system in which two voice band tones are
generated for each keypad key press.
Encryption
A coding of plain text (or clear voice) into
unintelligible forms for secure transmission.
Error Correction
Digital coding technique for detecting and
correcting information transmission errors.
FCC
Abbreviation for “Federal Communications
Commission”
Firmware
Software that is permanently stored in a
hardware device which allows reading and
executing the software, but not writing or
modifying the software.
Modulation
A controlled variation of any property of a
carrier wave for the purpose of transferring
information.