Motorola ASTRO Digital XTL 5000 Detailed Service Manual page 512

Glossary-6
Term
PLL
private-line tone
squelch
Programmable
Read-Only Memory
PROM
PTT
Push-to-Talk
radio frequency
radio frequency
power amplifier
Radio Interface Box
Radio Service
Software
random access
memory
RAM
read-only memory
real-time clock
receiver
registers
repeater
repeater/talkaround
May 25, 2005
See phase-locked loop.
A continuous sub-audible tone that is transmitted along with the carrier.
See also DPL.
A memory chip on which data can be written only once. Once data has
been written onto a PROM, it remains there forever.
See Programmable Read-Only Memory.
See 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.
The portion of the electromagnetic spectrum between audio sound and
infrared light (approximately 10 kHz to 10 GHz).
Amplifier having one or more active devices to amplify radio signals.
A service aid used to enable communications between a radio and the
programming software.
DOS-based software containing the feature set of an ASTRO radio. See
also CPS.
A type of computer memory that can be accessed randomly; that is, any
byte of memory can be accessed without touching the preceding bytes.
See random access 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.
A module that keeps track of elapsed time even when a computer is
turned off.
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.
Short-term data-storage circuits within the microcontroller unit or
programmable logic IC.
Remote transmit/receive facility that re-transmits received signals in
order to improve communications range and coverage (conventional
operation).
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.
Definition
6881096C74-B