Glossary
Glossary-7
repeater/talkaround
A conventional radio feature that permits communication through a
receive/transmit facility, which re-transmits received signals in order to
improve communication range and coverage.
RESET
Reset line: an input to the microcontroller that restarts execution.
RF
See radio frequency.
RF PA
See radio frequency power amplifier.
ROM
See read-only memory.
RPCIC
Regulator/power control IC.
RTC
See real-time clock.
RX
Receive.
RX DATA
Recovered digital data line.
SAP
See Serial Audio CODEC Port.
SCI IN
See Serial Communication Interface Input Line.
Serial Audio CODEC
Port
SSI to and from the GCAP II IC CODEC used to transfer transmit and
receive audio data.
Serial
Communication
Interface Input Line
A full-duplex (receiver/transmitter) asynchronous serial interface.
Serial Peripheral
Interface
How the microcontroller communicates to modules and ICs through the
CLOCK and DATA lines.
signal
An electrically transmitted electromagnetic wave.
Signal Qualifier
mode
An operating mode in which the radio is muted, but still continues to
analyze receive data to determine RX signal type.
softpot
See software potentiometer.
software
Computer programs, procedures, rules, documentation, and data
pertaining to the operation of a system.
software
potentiometer
A computer-adjustable electronic attenuator.
spectrum
Frequency range within which radiation has specific characteristics.
SPI
See Serial Peripheral Interface.
squelch
Muting of audio circuits when received signal levels fall below a pre-
determined value. With carrier squelch, all channel activity that exceeds
the radio’s preset squelch level can be heard.
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: ......