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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
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
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
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)
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
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
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
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
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
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 – 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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