Glossary-4
PTT Push-to-talk; the switch located on the left side of the radio which, when
pressed causes the radio to transmit.
QN Quick – N
RA/RT Remote Access/Remote Transmit
RAC Repeater Access Control
RdStat Receiver Data Status
Receiver Electronic device that amplifies RF signals. A Receiver separates the audio
signal from the RF carrier, amplifies it, and converts it back to the original
sound waves.
Repeater Remote transmit/receive facility that retransmits received signals in order to
improve communications range and coverage.
RF Radio Frequency, The portion of the electromagnetic spectrum between audio
sound and infrared light (approximately 10 kHz to 10 GHz).
RSS Radio Service Software; the software application used to program and service
the station.
RSSI Received Signal Strength Indicator; a dc voltage proportional to the received
RF signal strength.
Rx Receive.
SCM Station Control Module; station controller.
Signal An electrically transmitted electromagnetic wave.
SINAD Acronym for the ratio of signal plus noise plus distortion and noise plus
distortion.
SMR Schaumburg Manual Revision
Smart Repeater Trunking system in which channel control is distributed among several
repeaters.
Spectra-TAC Analog Total Area Coverage voting comparator used to select wide area
receivers.
Spectrum Frequency range within which radiation has specific characteristics.
SPI Serial Peripheral Interface (clock and data lines); simple synchronous serial
interface for data transfer between processors and peripheral ICs.
Squelch Muting of audio circuits when received signal levels fall below a pre-determined
value. With carrier squelch, all channel activity that exceeds the radio’s preset
squelch level can be heard.
SRAM Static RAM, memory chip used for scratchpad memory.
TCC Trunking Central Controller; main control unit of the trunked dispatch system;
handles ISW and OSW messages to and from radios in the field (See ISW and
OSW).
Term Definition
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