Motorola ASTRO SPECTRA Service Manual

6881076C20-E February 3, 2003
Glossary-7
RPCIC Regulator/power control IC.
RPT/TA See repeater/talkaround.
RSS See Radio Service Software.
RTC See real-time clock.
RX Receive.
RX DATA Recovered digital data line.
SAP See Serial Audio CODEC Port.
SCI IN Serial Communications 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.
SCI IN See Serial Communication Interface Input Line.
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.
SRAM See static RAM.
SRIB Smart Radio Interface Box. See RIB.
SSI See Synchronous Serial Interface.
Term Definition

Motorola ASTRO SPECTRA Specifications

General

Frequency Range	136-174 MHz, 403-470 MHz
Number of Channels	Up to 255
Channel Spacing	12.5 kHz, 20 kHz, 25 kHz
Modulation	FM
Operating Temperature	-22°F to +140°F (-30°C to +60°C)