Glossary-4
Glossary
Global Control
Audio and Power IC
A mixed-signal (analog and digital) integrated circuit that provides
control, audio, and voltage regulation functionality for the Controller
board.
GPIO
See General-Purpose Input/Output.
host code
Object code executed by the host processor in an ASTRO subscriber
radio. The host is responsible for control-oriented tasks such as
decoding and responding to user inputs.
IC
See integrated circuit.
IF
Intermediate Frequency.
IMBE
A sub-band, voice-encoding algorithm used in ASTRO digital voice.
inbound signaling
word
Data transmitted on the control channel from a subscriber unit to the
central control unit.
integrated circuit
An assembly of interconnected components on a small semiconductor
chip, usually made of silicon. One chip can contain millions of
microscopic components and perform many functions.
ISW
See inbound signaling word.
key-variable loader
A device used to load encryption keys into a radio.
kHz
See kilohertz.
kilohertz
One thousand cycles per second. Used especially as a radio-frequency
unit.
KVL
See key-variable loader.
LCD
See liquid-crystal display.
LED
See light emitting diode.
light emitting diode
An electronic device that lights up when electricity is passed through it.
liquid-crystal display
An LCD uses two sheets of polarizing material with a liquid-crystal
solution between them. An electric current passed through the liquid
causes the crystals to align so that light cannot pass through them.
LO
Local oscillator.
low-speed
handshake
150-baud digital data sent to the radio during trunked operation while
receiving audio.
LSH
See low-speed handshake.
Master In Slave Out
SPI data line from a peripheral to the MCU.
Master Out Slave In
SPI data line from the MCU to a peripheral.
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: ......