Glossary - Motorola HT750 - UHF/VHF/Low Band - Radio Service Manual

Glossary

Term
ALC
ASF IC
CD
CMP
CPS
CSQ
DTMF
DPL
EEPROM
Firmware
FGU
GaAs
ISW
LCD
LDMOS
LH DATA
LLE
LSH
LTR
MDC
Automatic Level Control: a circuit in the transmit RF path that controls RF
power amplifier output, provides leveling over frequency and voltage, and
protects against high VSWR (voltage standing wave ration).
Audio Signaling Filter Integrated Circuit with voice compander.
Compact Disk.
Compression.
Customer Programming Software.
Carrier Squelch.
Dual-Tone Multifrequency.
Digital Private-Line.
Electronically Erasable/Programmable Read-Only Memory: used by the radio
to store its personality.
Software, or a software/hardware combination of computer programs and data,
with a fixed logic configuration stored in a read-only memory. Information
cannot be altered or reprogrammed.
Frequency Generation Unit.
Gallium Arsenide: a type of crystalline material used in some semiconductors.
Inbound Signalling Word: data transmitted on the control channel from a
subscriber unit to the central control unit.
Liquid Crystal Display: a module used to display the radio's current operating
channel or system and scan status.
Lateral Diffusion MOS.
Longhorn Data: a bidirectional 0-5V, RS-232 line that uses the microcontroller's
integrated RS-232 asynchronous serial communications interface (SCI)
peripheral.
Low Level Expander: slight amount of volume expansion; used to improve the
signal to noise ratio.
Low-Speed Handshake: 150 baud digital data sent to the radio during trunked
operation while receiving audio.
Trunked signaling protocol using low speed data. Registered trademark of E.F.
Johnson Company.
Motorola Digital Communication.
Definition
Glossary-1