6878215A01
Glossary-6
PA Power amplifier.
paging One-way communication that alerts the receiver to retrieve a message.
PC Board Printed Circuit Board. Also referred to as a PCB.
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.
PMR See Publication Manual Revision.
private-line tone
squelch
A continuous sub-audible tone that is transmitted along with the carrier.
See also DPL.
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.
programming cable A cable that allows the CPS to communicate directly with the radio
using RS232.
Project 25 See APCO 25.
PROM See Programmable Read-Only Memory.
PTT See Push-to-Talk.
Publication Manual
Revision
A publication that provides supplemental information for its parent
publication before it is revised and reissued.
Push-to-Talk The switch or button that causes the radio to transmit when pressed.
When the PTT switch or button is released, the unit returns to standby
or 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 Not used with APX 7500. The radio communicates directly to the
computer via a single programming cable. See programming cable.
Radio Service
Software
Not used with APX 7500. See Customer Programming Software.
RAM See random access memory.
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.
Term Definition
To Next Page
Loading...
