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.
Summary of Contents for SYMBOL MT2000 Series
Page 1: ...HT 1000 JT 1000 MT 2000 MTS 2000 and MTX Series Handie Talkie Portable Radios Service Manual ...
Page 2: ......
Page 24: ...2 Notes ...
Page 78: ...56 Notes ...
Page 147: ...Appendix A 9 Appendix Figure 2 Secure Module Location Detail ...
Page 169: ......
