February 3, 2003 6881076C20-E
Glossary-6
PTT See Push-to-Talk.
Push-to-Talk The switch or button usually located on the left side of the radio which,
when pressed, causes the radio to transmit. When the PTT is released,
the unit returns to receive operation.
radio frequency The portion of the electromagnetic spectrum between audio sound and
infrared light (approximately 10 kHz to 10 GHz).
radio frequency
power amplifier
Amplifier having one or more active devices to amplify radio signals.
Radio Interface Box A service aid used to enable communications between a radio and the
programming software.
Radio Service
Software
DOS-based software containing the feature set of an ASTRO radio. See
also CPS.
random access
memory
A type of computer memory that can be accessed randomly; that is, any
byte of memory can be accessed without touching the preceding bytes.
RAM See random access memory.
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.
Term Definition
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