Motorola DR 3000 service manual Tot, Tpl, Uhf, Vip

Glossary-2

Term	Definition
PC Board	Printed Circuit Board. Also referred to as a PCB.
PL	Private-Line Tone Squelch: A continuous sub-audible tone that is transmitted
	along with the carrier.
Programming Cable	A cable that allows the CPS to communicate directly with the radio using
	RS232.
Receiver	Electronic device that amplifies RF signals. A receiver separates the audio
	signal from the RF carrier, amplifies it, and converts it back to the original
	sound waves.
Repeater	Remote transmit/receive facility that re-transmits received signals in order to
	improve communications range and coverage (conventional operation).
RF	Radio Frequency: The portion of the electromagnetic spectrum between audio
	sound and infrared light (approximately 10 kHz to 10 GHz).
RX	Receive.
Signal	An electrically transmitted electromagnetic wave.
Spectrum	Frequency range within which radiation has specific characteristics.
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.
TOT	Time-out Timer: A timer that limits the length of a transmission.
TPL	Tone Private Line
Transceiver	Transmitter-receiver. A device that both transmits and receives analog or digital
	signals. Also abbreviated as XCVR.
Transmitter	Electronic equipment that generates and amplifies an RF carrier signal,
	modulates the signal, and then radiates it into space.
TX	Transmit.
UHF	Ultra-High Frequency.
USB	Universal Serial Bus: An external bus standard that supports data transfer rates
	of 12 Mbps.
VIP	Vehicle Interface Port.

February 21, 2007 6866576D03-A