Push-to-talk; the switch located on the left side of the radio which, when pressed causes the radio to
transmit.
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).
RSSI
Received Signal Strength Indicator; a dc voltage proportional to the received RF signal strength.
Rx
Receive.
SCM
Station Control Module; station controller.
SELV
Separated Extra Low Voltage
Signal
An electrically transmitted electromagnetic wave.
SINAD
Acronym for the ratio of signal plus noise plus distortion and noise plus distortion.
SLR
Refers to Digital Professional Repeater model names in the MOTOTRBO
Professional Digital Two-Way Radio System.
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
Glossary of Terms and Acronyms
Motorola Solutions Confidential
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