Motorola HT 1000 service manual Pll, Xvi

PLL	Phase-Locked Loop; a circuit in which an oscillator is kept in phase with a
	reference, usually after passing through a frequency divider.
PTT	Push-To-Talk; the switch located on the left side of the radio which, when
	pressed, causes the radio to transmit.
Registers	Short-term data-storage circuits within the microcontrol unit or programmable
	logic IC.
RESET	Reset line; an input to the microcontroller that restarts execution.
RF PA	Radio Frequency Power Amplifier.
RSS	Radio Service Software.
RSSI	Received signal strength indicator; a dc voltage proportional to the received rf
	signal strength.
RX DATA	Recovered digital data line.
SLIC	Support-Logic IC; a custom gate array used to provide I/O and memory
	expansion for the microcontroller.
SmartRib	Use in conjunction with the RSS to read the Flashcode and Model Number, and
	to flash upgrade radios.
Softpot	Software potentiometer; a computer-adjustable electronic attenuator.
Software	Computer programs, procedures, rules, documentation, and data pertaining to
	the operation of a system.
Squelch	Muting of audio circuits when received signal levels fall below a pre-determined
	value.
SRAM	Static-RAM chip used for volatile, program/data memory.
Standby Mode	An operating mode whereby the radio is muted but still continues to monitor
	data.
TOT	Time-Out Timer; a timer that limits the length of a transmission.
TPL	Tone Private-Line; Continuous Tone Coded Squelch System (CTCSS), industry
	standard.
TSOP	Thin Small-Outline Package.
µC	Microcontrol unit (see MCU).
VCO	Voltage-Controlled Oscillator; an oscillator whereby the frequency of oscillation
	can be varied by changing a control voltage.
VSWR	Voltage Standing Wave Ratio.

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