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G-2
Glossary of Terms
PL
Private-Line
®
tone squelch: a continuous sub-audible tone that is transmitted along with
the carrier.
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; when pressed, causes the
radio to transmit.
RAM
Random Access Memory: the radio’s RAM is loaded with a copy of the EEPROM data.
Registers
Short-term data-storage circuits within the microcontroller.
RESET
Reset line: an input to the microcontroller that restarts execution.
RF PA
Radio Frequency Power Amplifier
ROM
Read Only Memory
RSSI
Received Signal-Strength Indicator: a dc voltage proportional to the received RF signal
strength.
RPT/TA
Repeater/Talk-Around
Softpot
A computer-adjustable electronic attenuator
Software
Computer programs, procedures, rules, documentation, and data pertaining to the
operation of a system.
SPI (clock and data
lines)
Serial Peripheral Interface: how the microcontroller communicates to modules and ICs
through the CLOCK and DATA lines.
Squelch
Muting of audio circuits when received signal levels fall below a pre-determined value.
Standby Mode
An operating mode whereby the radio is muted but still continues to receive data
TOT
Time-Out Timer: a timer that limits the length of a transmission.
TPL
Tone Private-line
µC
Microcontroller
µP
Microprocessor
UHF
Ultra High Frequency
VCO
Voltage-Controlled Oscillator: an oscillator whereby the frequency of oscillation can be
varied by changing a control voltage.
VCOBIC
Voltage-Controlled Oscillator Buffer Integrated Circuit
VHF
Very High Frequency
VSWR
Voltage Standing Wave Ratio
Term
Definition
Содержание P100 Series
Страница 1: ...P100 Series Portable Radios Detailed Service Manual ...
Страница 2: ......
Страница 8: ...iv Notes ...
Страница 18: ...xiv List of Tables Notes ...
Страница 22: ...xviii Summary of Printed Circuit Boards and Bands Available Notes ...
Страница 30: ...Notes 2 4 Test Equipment Service Aids and Service Tools Service Aids ...
Страница 54: ...7 4 UHF2 Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 128: ...7 78 Circuit Board Schematic Diagram and Parts List UHF2 435 480 MHz Notes ...
Страница 150: ...7 100 Circuit Board Schematic Diagram and Parts List UHF2 MDC QCII R TTE 435 470 MHz Notes ...
Страница 166: ...10 4 VHF Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 192: ...10 26 Circuit Board Schematic Diagram and Parts List VHF 136 174 MHz Notes ...
Страница 218: ...10 52 Circuit Board Schematic Diagram and Parts List VHF 136 174 MHz Notes ...
Страница 242: ...10 76 Circuit Board Schematic Diagram and Parts List VHF MDC QCII R TTE 136 174 MHz Notes ...
Страница 258: ...13 4 UHF1 Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 261: ...Circuit Board Schematic Diagram and Parts List UHF1 403 447 MHz 13 7 Figure 13 5 Transmitter Schematic Diagram ...
Страница 328: ...13 74 Circuit Board Schematic Diagram and Parts List UHF1 MDC QCII R TTE 403 447 MHz Notes ...
Страница 332: ...A 4 Warranty Service Support and Replacement Parts Further Assistance From Motorola Notes ...
Страница 335: ......