Motorola 6816101H01-A service manual Glossary of Terms, Term Definition, Pll, Ptt, Reset

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GLOSSARY OF TERMS

Term	Definition
Busy Channel	If BCLO is activated, the radio will check for channel activity before transmit-
Lockout (BCLO)	ting. If activity is detected, transmission is prohibited. For carrier squelch mode,
	radio will not transmit, if it is receiving carrier. For coded squelch mode, it will
	not transmit, if it is receiving carrier with different PL/DPL code.
Carrier	An electromagnetic signal that is transmitted on a selected frequency for the
	purpose of carrying voice or data transmissions along with it. Carrier can then
	be received by all radios listening on that frequency.
CD	Compact Disk.
Channel	A single path separated by frequency or time divisions used for transmitting
	and/or receiving voice and/or data.
Codeplug	A solid-state chip inside a radio where the radio‟s personality data is stored.
CPS	Acronym for Customer Programming Software. Licensed Motorola software
	used to program two-way radios with a unique set of features.
Frequency	(a) The location of the center of a channel of operation in the radio spectrum.
	Measured in Megahertz (MHz).
	(b) A computer speed. Measured in Megahertz (MHz).
Model Number	The model number identifies the type of radio. This information is stored in the
	radio‟s codeplug.
Normal Scan	For Normal Scan, the radio assigns equal priority to all members in the Scan
	List selected for the current channel. When the radio is scanning a Scan List
	(Active Scan), all scan list members (including the Home Channel) will be allocated
	equal time to be scanned. For example, if the Home Channel is H1, and
	the Scan List Members are Nn, then the scanning sequence is: N1, N2, N3, ...,
	H1, N1, N2, ..., etc.
PLL	Phase-Locked Loop: a circuit in which an oscillator is kept in phase with a ref-
	erence, usually after passing through a frequency divider.
Priority Scan	For Priority Scan, the radio assigns the highest priority to the channel defined
	in the CPS as Priority Channel. When the radio is scanning a Scan List (Active
	Scan), 50% of the scans are targeted at the Priority Channel. For example, if
	the Priority Channel is P1, and the non-priority Scan List Members are Nn, then
	the scanning sequence is: P1, N1, P1, N2, P1, N3, P1, N4, P1, N5, etc.
Program	The transfer of CPS information from the computer‟s temporary memory (RAM)
	to the radio.
PTT	Push-To-Talk: the switch located on the left side of the radio which, when
	pressed, causes the radio to transmit.
RESET	Reset line: an input to the microcontroller that restarts execution.
Reverse Burst /	Causes a Tone Private Line (TPL) or Digital Private Line (DPL) code to be
Turn Off Code	transmitted at the end of a transmission - once PTT is released, and while op-
	erating on the current channel. This sub-audible tone causes the receiving ra-
	dio to mute its speaker before loss of a carrier is detected. Muting the speaker
	eliminates unwanted noise (squelch tail) during loss of carrier detection.