Motorola ASTRO APX O2 User Manual page 148

Glossary-2
Term
Megahertz
microcontroller unit
PA
paging
PTT
Publication Manual
Revision
Push-to-Talk
radio frequency
RAM
random access
memory
receiver
registers
RESET
RF
RX
signal
software
time-out timer
TOT
transceiver
transmitter
One million cycles per second. Used especially as a radio-frequency
unit.
Also written as µC. A microprocessor that contains RAM and ROM
components, as well as communications and programming components
and peripherals.
Power amplifier.
One-way communication that alerts the receiver to retrieve a message.
See Push-to-Talk.
A publication that provides supplemental information for its parent
publication before it is revised and reissued.
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.
The portion of the electromagnetic spectrum between audio sound and
infrared light (approximately 10 kHz to 10 GHz).
See 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.
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.
Reset line: an input to the microcontroller that restarts execution.
See radio frequency.
Receive.
An electrically transmitted electromagnetic wave.
Computer programs, procedures, rules, documentation, and data
pertaining to the operation of a system.
A timer that limits the length of a transmission.
See time-out timer.
Transmitter-receiver. A device that both transmits and receives analog
or digital signals. Also abbreviated as XCVR.
Electronic equipment that generates and amplifies an RF carrier signal,
modulates the signal, and then radiates it into space.
Definition
6878215A01