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G-2
Term
PL
PLL
PTT
RAM
Registers
Repeater
RESET
RF PA
RIB
ROM
RSSI
RPT/TA
Softpot
Software
SPI (clock and data
lines)
Squelch
Standby Mode
System Central
Controller
System Select
TOT
TPL
µC
UHF
µP
VCO
VCOBIC
VHF
VSWR
Private-Line® tone squelch: a continuous sub-audible tone that is transmitted along
with the carrier.
Phase-Locked Loop: a circuit in which an oscillator is kept in phase with a reference,
usually after passing through a frequency divider.
Push-To-Talk: the switch located on the left side of the radio which, when pressed,
causes the radio to transmit.
Random Access Memory: the radio's RAM is loaded with a copy of the EEPROM
data.
Short-term data-storage circuits within the Microcontroller.
Remote transmit/receive facility that retransmits received signals to improve
communications coverage.
Reset line: an input to the Microcontroller that restarts execution.
Radio Frequency Power Amplifier
Radio Interface Box
Read Only Memory
Received Signal-Strength Indicator: a DC voltage proportional to the received RF
signal strength.
Repeater/Talk-Around
Software Potentiometer: a computer-adjustable electronic attenuator
Computer programs, procedures, rules, documentation, and data pertaining to the
operation of a system.
Serial Peripheral Interface: how the Microcontroller communicates to modules and
ICs through the CLOCK and DATA lines.
Muting of audio circuits when received signal levels fall below a pre-determined value.
An operating mode in which the radio is muted but continues to receive data
Main control unit of the trunked dispatch system; handles ISW and OSW messages
to and from subscriber units (see ISW and OSW).
The act of selecting the desired operating system with the system-select switch.
(Also, the name given to this switch.)
Time-Out Timer: a timer that limits the length of a transmission.
Tone Private-Line
Microcontroller
Ultra High Frequency
Microprocessor
Voltage-Controlled Oscillator: an oscillator whereby the frequency of oscillation can
be varied by changing a control voltage.
Voltage-Controlled Oscillator Buffer Integrated Circuit
Very High Frequency
Voltage Standing Wave Ratio
Definition
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