Glossary Section 3: Glossary-7
personality A set of unique features specific to a radio.
phase-locked loop A circuit in which an oscillator is kept in phase with a reference, usually
after passing through a frequency divider.
PL See private-line tone squelch.
PLL See phase-locked loop.
preprogrammed A software feature that has been activated by a qualified radio
technician.
Private
(Conversatiion) Call
A feature that lets you have a private conversation with another radio
user in the group.
private-line tone
squelch
A continuous sub-audible tone that is transmitted along with the carrier.
See also DPL.
programmable A radio control that can have a radio feature assigned to it.
Programmable
Read-Only Memory
A memory chip on which data can be written only once. Once data has
been written onto a PROM, it remains there forever.
PROM See Programmable Read-Only Memory.
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.
Term Definition
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