Motorola Xtl5000 Detailled 6881096c74 B Manual

6881096C74-BMay 25, 2005
Glossary-5
microcontroller unitAlso written as µC. A microprocessor that contains RAM and ROM 
components, as well as communications and programming components 
and peripherals.
microprocessor coreThe central processing unit of the microprocessor and DSP IC and 
powered by a lower voltage supply than the logic I/O section.
MISOSee Master In Slave Out.
MOSISee Master Out Slave In.
multiplexerAn electronic device that combines several signals for transmission on 
some shared medium...

May 25, 20056881096C74-B
Glossary-6
PLLSee phase-locked loop.
private-line tone 
squelchA continuous sub-audible tone that is transmitted along with the carrier. 
See also DPL.
Programmable 
Read-Only MemoryA memory chip on which data can be written only once. Once data has 
been written onto a PROM, it remains there forever.
PROMSee Programmable Read-Only Memory.
PTTSee Push-to-Talk.
Push-to-TalkThe switch or button usually located on the left side of the radio which, 
when pressed, causes the radio to...

6881096C74-BMay 25, 2005
Glossary-7
RESETReset line: an input to the microcontroller that restarts execution.
RFSee radio frequency.
RF PASee radio frequency power amplifier.
RIBSee Radio Interface Box.
ROMSee read-only memory.
RPCICRegulator/power control IC.
RPT/TASee repeater/talkaround.
RSSSee Radio Service Software.
RTCSee real-time clock.
RXReceive.
RX DATARecovered digital data line.
SAPSee Serial Audio CODEC Port.
Serial Audio CODEC 
PortSSI to and from the GCAP II IC CODEC used to transfer...

May 25, 20056881096C74-B
Glossary-8
SRAMSee static RAM.
SRIBSmart Radio Interface Box. See RIB.
SSISee Synchronous Serial Interface.
Standby modeAn operating mode in which the radio is muted but still continues to 
monitor data.
static RAMA type of memory used for volatile, program/data memory that does not 
need to be refreshed.
Synchronous Serial 
InterfaceDSP interface to peripherals that consists of a clock signal line, a frame 
synchronization signal line, and a data line.
system central...

6881096C74-BMay 25, 2005
Glossary-9
USBSee Universal Serial Bus.
VCOSee voltage-controlled oscillator.
vector sum excited 
linear predictive 
codingA voice-encoding technique used in ASTRO digital voice.
VHFVery-High Frequency.
VIPVehicle Interface Port.
VOCONSee vocoder/controller.
vocoderAn electronic device for synthesizing speech by implementing a 
compression algorithm particular to voice. See also voice encoder.
vocoder/controllerA PC board that contains an ASTRO radio’s microcontroller, DSP,...

May 25, 20056881096C74-B
Glossary-10
Notes 

Index-i
6881096C74-BMay 25, 2005
IndexIndex
Numerics
1st local oscillator (LO)
136-174 MHz band  .............................................. 3-49
380-470 MHz band  .............................................. 3-52
450-520 MHz band  .............................................. 3-57
700-800 MHz band  .............................................. 3-61
2nd local oscillator (LO)
136-174 MHz band  .............................................. 3-21
380-470 MHz band...

Index-ii
May 25, 20056881096C74-B
plus DEK configuration  ................................... 2-4
standard configuration  .................................... 2-2
W3 configuration  ............................................. 2-4
VIP input connections ......................................... 2-6
controller
analog mode of operation  .................................... 2-12
ASTRO mode of operation  ................................... 2-13
components and circuitry  ........................................

Index-iii
6881096C74-BMay 25, 2005
136-174 MHz band
charge pump bias  ............................................. 3-48
description ........................................................ 2-10
lock detect  ........................................................ 3-48
loop filter  ........................................................... 3-48
LV Frac-N synthesizer  ...................................... 3-46
modulation ........................................................ 3-47
prescaler feedback...

Index-iv
May 25, 20056881096C74-B
ignition sense circuits, control-head assembly  .......... 2-7
image filter, receiver front-end (380-470 MHz band)  3-16
image filter, receiver front-end (450-520 MHz band)  3-18
interconnect board
remote
board layout  ...................................... 8-3, 8-10, 8-14
schematic ........................................... 8-2, 8-9, 8-13
W3 hand-held  ......................................................... 8-1
interface board, secure...