Acronyms :: M-R


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M

M – Mega-Million
MAC – Multiplexed Analog Components
MAN – Metropolitan Area Network
MAP – Middle Atmosphere Component
MARISAT – Maritime Satellite System (USA/Inmarsat)
MASER – Microwave Amplification by Simulated Emission of Radiation
MB/S, MBPS or M BIT/S – Megabits per second
MBA – Multiple Beam Antenna
MBTA – Multiple Tours Antenna
MC – Maintenance Center
MCC – Master Control Console
MCLF – Multichannel Loading Factor
MCS – Maritime Communications System
MCU – Monitor and Control Unit
MCW – Modulated Continuous Wave
MDA – Mechanically Despun Antenna
MDS – Multipoint Distribution Service
MDF – Main Distribution Frame
MDFD – Multi-Destination Full Duplex
MDHD – Multi-Destination Half Duplex
MDS – Minimum Discemible Signal
MDTA – Modulator-Demodulator-Translator Assemble
MDUS – Medium Data Utilization Station (Australia)
MECO – Main Engine Cut-Off
MEGA – Million
MELCO – Mitsubishi Electric Corporation (Japan)
MERS – Most Economical Routing Scheme
MET – Mission Elapsed Time
MF – Multifrequency
MF – Medium Frequency
MFR – Multifrequency Register
MFS – Multifrequency Sender
MFTDMA – Multiple Frequency Time Division Multiple Access
MG – Motor Generator
MGC – Multigroup Controller
MHZ – Megahertz
MIFR – Master International Frequency Register
MIP – Multigroup Interference Processor
MMDS – Microwave Multipoint Distribution System
MMIC – Monolithic Microwave Integrated Circuit
MMS – Multimission Modular Spacecraft
MMSS – Maritime Mobile Satellite Service
MMV – Multimission Modular Vehicle
MOD – Modulator
MOI – Moments of Inertia
MOL – Mole (Amount of Substance)
MON – Monitoring Station
MOS – Metal-Oxide Semiconductor
MPEG – Motion Picture Experts Group
MS – Meeting of Signatories (Intelsat)
MS – Millisecond
MSC – Management Services Contract(or)
MSD – Most Significant Digit
MSK – Minimum Shift Keying
MSM – Microwave Switch Matrix
MSS – Multi-Spectral Scanner
MSSF – Mate Scanner Stop Failure
MSU – Microwave Sounding Unit
MTBF – Mean Time Before/Between Failures
MTTF – Mean Time to Failure
MTTR – Mean Time to Repair
MTU – Magnetic Tape Unit
MU – Multi-Destination Unidirectional
MUF – Maximum Usable Frequency
MUX – Multiplex
MW – Microwave

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N

N – Nano (one-billionth)
NASA – National Aeronautics and Space Administration (USA)
NASC – National Aeronomics and Space Council (USA)
NASCOM – NASA Communications Network (USA)
NASDA – National Space Development Agency (Japan)
NAT/TFG – North Atlantic Traffic Forecasting Group
NB – Narrow Band
NCC — Network Control Center
NF – Noise Figure
NHK – Japan Broadcasting Corporation (Japan)
NIC – Nearly Instantaneous Companding
NICD – Nickel-cadmium (battery)
NIH – Nickel Hydrogen (battery)
NOI – Notice of Inquire (FCC)
NORAD – North American Air Defense Command (USA)
NPL – National Physical Laboratory (UK)
NPR – Noise Power Ratio
NCR – National Research Council (Canada)
NRL – Naval Research Laboratory (USA)
NRMS – Network Reference & Monitor Station
NRSC – National Remote Sensing Center (PRC, UK)
NRZ – Non Return-to-Zero
NS – Nanosecond
NTC – Network Transmission Committee (VITEAC)
NTIA – National Telecommunications Information Administrations (USA)
NTSC – National Television System Committee (USA) (Committee of representatives of the television industry in the U.S. on whose findings and recommendations television standards are established.
NTSC – System of color television based on the recommendation of the NTSC using 525 lines and 60 fields with a video bandwidth of 4.2 MHz (US, Canada, Japan)
NTT – Nippon Telegraph & Telephone Public Corporation (Japan)

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O

O AND M – Operation and Maintenance
OACI – Organization de Aviacion Civil International (International Civil Aviation Organization (ICAO)
OAO – Orbiting Astronomical Observatory
OAS – Orbit Adjust Subsystem
OBE – Out-of-Band Emission
OBN – Out-of-Band Noise
OCC – Operation Control Center
OFHC – Oxygen-Free High Conductivity Copper
OFT – Orbital Flight Test
OGO – Orbiting Geophysical Observatory
OIRT – International Radio & Television Organization
OMS – Orbital Maneuvering System
OMT – Orthomode Transducer
ONERA – Office Nationale d’Etudes et de Recherches Aerospatiales (National Bureau for Aerospace Studies and Research) (France)
OPSK – Octal Phase Shift Keying
ORBIS – Orbiting Radio Beacon Ionospheric Satellite
OSC – Oscillator
OSM – Miniaturized Rigid Coaxial Cable
OSPK – Off-Set Keyed Quadrature Phase Shift Keying
OSR – Orbital Solar Reflector
OTC – Overseas Telecommunications Commission (Australia)
OTE – Hellenic Telecommunications Organization (Greece)
OTS – Orbital Test Satellite
OTV – Orbital Transfer Vehicle
OUB – Occasional Use Bands
OW – Orderwire

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P

P – Private or Special Telephone Circuit (CCITT)
P – Pico (One Trillionth)
P-P – Peak-to-Peak
PA – Power Amplifier
PA – Preassigned
PABX – Private Automatic Branch Exchange
PAD – Packet Assembly and Disassembly
PAL – Phase Alternative Line (a television standard) Phase Attenuation by Line
PAL COLOR – A color television system developed in Germany using 625 lines and 50 fields with a video bandwidth of 5 MHz (Western Europe)
PAL-M – PAL System using NTSC Parameters
PAM – Pulse Amplitude Modulation
PAM — Payload Assist Module
PAMA – Pre-assigned Multiple Access
PAM-D – Payload Assist Module D
PAML – Program Authorized Materials List
PAPM – Pulse Amplitude Phase Modulation
PAR – Parity
PARAM – Parametric Low-Noise Amplifier
PBX – Private Branch Exchange
PC – Printed Circuit
PCE – Power Conditioning Electronics
PCM – Pulse Code Modulation
PCU – Power Control Unit
PDM – Pulse Duration Modulation
PDR – Preliminary Design Review
PESC – Telephone Engineering Service Circuit
PF – Picofarad (Unit of electrical capacitance)
PF – Power Factor
PFD – Power Flux Density
PFIX – Power Failure Interrupt
PFM – Pulse Frequency Modulation
PFO – Pilot Frequency Oscillator
PGM – Program
PH – Phase
PICO – A Trillionth
PIP – Payload Integration Plan
PKM – Perigee Kick Motor
PL – Parts List
PL – Path Loss
PLE – Plesetsk Launch Complex (USSR)
PM – Phase Modulation
PMA – Permanent Management Arrangements
PMB – Proto Main Body
PMS – Picturephone Meeting Service
PN – Pseudo-Noise
POL – Polarization
POLANG – Polarization Angle
POR – Pacific Ocean Region
PPF – Payload Processing Facility (USAF)
PPM – Pulse Position Modulation
PPS – Pulse Per Second
PPV – Pay-per-view
PQM – Proto Qualification Model
PR – Private Renter
PREAMP – Preamplifier
PRN – Pseudo-Random Noise
PROC – Processor
PRPM – Primary Power Monitor
PS – Power Supply
PSD – Performance Start Date
PSI – Pounds per square inch
PSK – Pounds Shift Keying
PSN – Packet Switching Network
PSN – Private Satellite Network
PSSC – Public Service Satellite Consortium
PSTN – Public Switched Telephone Network
PTC – Pacific Telecommunications Council
PTLU – Pre-Transmission Line-Up
PTM – Pulse Time Modulation
PTT – Post, Telegraph, Telephone
PULSAR – Pulsed Sequential Access Relay
PV – Present Value
PW – Picowatt
PWM – Pulse Width Modulation
PWP – Picowatt psophometrically weighted
PWPO – Picowatt Psophometrically weighted measured at a point of zero reference level
PWR – Power

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Q

QA – Quality Assurance
QAM-PAM – Quadrature Amplitude Modulation-Pulse Amplitude Modulation
QC – Quality Control
QM – Qualification Model
QPSK – Quadra-Phase Shift Keyed

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

R

R – Degree Rankin (absolute scale based on Fahrenheit)
RA – Right Ascension
RAD – Radian
RAF – Rate Adjusted Factor
RAM – Random Access Memory
RARC – Regional Administrative Radio Conference
RAS – Remote Analysis System
RBOC – Regional Bell Operating Company
RBV – Return Beam Vidicon
RC – Resistance-Capacitance
RCC – Radio Common Carrier
RCO – Restoration Control Office
RCS – Reaction Control Subsystem
RCVR – Receiver
RDF – Repeater Distribution Frame
RDG – Receive Data Gate
RDT&E – Research, Development, Testing & Evaluation
REF – Reference
REL – Release
RESTEC – Remote Sensing Technology Center (Japan)
RET – Reliable Earth Terminal
REV – Revolution
RF – Radio Frequency
RGM – Release Guard Message
RHCP – Right-Hand Circular Polarization
RIS – Retransmission Indication Signal
RLO – Restoration Liaison Officer
RMBAFN – Reconfigurable Multibeam Antenna Feed Network
RMS – Root Mean Square
RMS – Remote Manipulator System
RN – Reference Noise
RO – Receive Only
RPM – Revolutions per Minute
RPS – Revolutions per Second
RQ – Repetition of Information
RR/U – Revenue Requirements per Unit
RSE – Register Signaling Equipment
RSP – Receive Shift Pulse
RTE/TSM – TDMA Reference and Monitor Station Equipment
RFT – Radiotelephony
RTG – Radiotelegraphy
RTG – Radio-isotope Thermoelectric Generator
RTS – Request to Send
RTT – Regie des Telegraphes et des Telephones (Belgium)
RX – Receive
RZ – Return to Zero

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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