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Glossary-7
read-only memory A type of computer memory on which data has been prerecorded. Once
data has been written onto a ROM chip, it cannot be removed and can
only be read.
real-time clock A module that keeps track of elapsed time even when a computer is
turned off.
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.
registers Short-term data-storage circuits within the microcontroller unit or
programmable logic IC.
repeater Remote transmit/receive facility that re-transmits received signals in
order to improve communications range and coverage (conventional
operation).
repeater/talkaround A conventional radio feature that permits communication through a
receive/transmit facility, which re-transmits received signals in order to
improve communication range and coverage.
RESET Reset line: an input to the microcontroller that restarts execution.
RF See radio frequency.
RF PA See radio frequency power amplifier.
RIB See Radio Interface Box.
ROM See read-only memory.
RPT/TA See repeater/talkaround.
RSS See Radio Service Software.
RTC See real-time clock.
RX Receive.
RX DATA Recovered digital data line.
Serial Peripheral
Interface
A serial interface in which a master device supplies clock pulses (SCLK)
to exchange data serially with a slave over two data wires (MOSI and
MISO). A chip-select input (CS) is usually required to enable the IC.
Using this chip-select signal, it is possible to connect many ICs to same
SPI bus in parallel.
signal An electrically transmitted electromagnetic wave.
Signal Qualifier
mode
An operating mode in which the radio is muted, but still continues to
analyze receive data to determine RX signal type.
softpot See software potentiometer.
Term Definition
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