Glossary
Glossary-5
MCU
See microcontroller unit.
MDC
Motorola Digital Communications.
MDI
MCU/DSP Interface internal to the Patriot IC.
MHz
See Megahertz.
Megahertz
One million cycles per second. Used especially as a radio-frequency
unit.
microcontroller unit
Also written as µC. A microprocessor that contains RAM and ROM
components, as well as communications and programming components
and peripherals.
MISO
See Master In Slave Out.
MOSI
See Master Out Slave In.
multiplexer
An electronic device that combines several signals for transmission on
some shared medium (e.g., a telephone wire).
MUX
See multiplexer.
NiMH
Nickel-metal-hydride.
OMPAC
See over-molded pad-array carrier.
open architecture
A controller configuration that utilizes a microprocessor with extended
ROM, RAM, and EEPROM.
oscillator
An electronic device that produces alternating electric current and
commonly employs tuned circuits and amplifying components.
OSW
See outbound signaling word.
OTAR
See over-the-air rekeying.
outbound signaling
word
Data transmitted on the control channel from the central controller to the
subscriber unit.
over-molded pad-
array carrier
A Motorola custom IC package, distinguished by the presence of solder
balls on the bottom pads.
over-the-air rekeying
Allows the dispatcher to remotely reprogram the encryption keys in the
radio.
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.
PCIC
See Power Control IC.
Term
Definition
Summary of Contents for Astro APX 3000
Page 1: ...APXTM TWO WAY RADIOS APX 3000 DETAILED SERVICE MANUAL ...
Page 2: ......
Page 4: ...Notes ...
Page 6: ...vi Document History Notes ...
Page 10: ...x Table of Contents Notes ...
Page 12: ...xii List of Tables Notes ...
Page 18: ...xviii List of Figures Notes ...
Page 22: ...xxii CommercialWarranty Notes ...
Page 46: ...3 20 Theory of Operation Main Board Notes ...
Page 84: ...3 58 Theory of Operation Bluetooth Notes ...
Page 208: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 222: ...7 14 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 282: ...8 60 Schematics Boards Overlays and Parts Lists Main Board Block UHF1 84012513001_A Notes ...
Page 390: ...8 168 Schematics Boards Overlays and Parts Lists Main Board Block VHF 84012512001_A Notes ...
Page 456: ...9 8 Debugging Fixture Powering up Covert Board Notes ...
Page 468: ...Glossary 10 Glossary Notes ...
Page 472: ...Index 4 Index Notes ...
Page 473: ......