MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX-P1162
51
GloSSaRy oF tERMS
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
BIT Error Rate.
BPS
BITs Per Second – a data rate measure.
C4FM
Constant Envelope 4-Level Frequency
Modulation – an FM transmitter which uses
Quadrature Phase Shift Keying (QPSK)
modulation to work with a compatible
frequency discriminator detection (CFDD)
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 defined 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
Digital Coded Squelch.
DSP
Digital Signal Processor – a specialized
microprocessor.
DTMF
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
Federal Communications Commission.
Firmware
Software that is permanently stored in a
hardware device, and allows reading and
executing, but not writing or modifying the
software.
I
/O
Input / Output
ISO
International Standards Organization
LSB
Least Significant BIT.
