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i didn't) OM Male voice ("Old Man") OMEGA Global LF navigation system, replaced by GPS OMS ("ohms") Orbital Maneuvering System (NASA) OOB (1)Out of band OOB (2)Out Of Bounds (classic Internet hack) OOK On-off keying OOOI Out, Off, On, In (ACARS time reporting) op Operation OP Observation Post OPAL Orbiting Picosat Automatic Launcher OPC Operations Center OPCEN Operations Center OPCODE Operations code OPCON Operational control OPF Orbiter Processing Facility (NASA) OPLAN Operations plan OPORD Operation order OPSEC Operation Security OR Offroute (unscheduled flights, usually military) ORBS Open Relay Behaviour-modification System (anti-email-spam) ORFM Office of Radio Frequency Management org organization (Internet) OS Operating system (code that runs a computer) OS/2 Operating System II (IBM) OS/2 Operating System 2, proprietary IBM op-system for PS/2 OSC Operations Systems Center, USCG, VA OSCAR Orbiting Satellite Carrying Amateur Radio OSCE Organization for Security and Cooperation in Europe OSCR Ocean Surface Current Radar OSI Open Systems Interconnection (coincidentally, OSI is by ISO) OSIR ISO's famous 7-layer "OSI Reference Model" for packet OSIRM ISO's famous 7-layer "OSI Reference Model" for packet OSPF Open Shortest Path First OSS Office of Special Services, WWII OSTP Office of Science and Technology Policy (US Government) OSWER Office of Solid Waste and Emergency Response OTAN NATO in French OTAR Over-The-Air Rekeying (crypto) OTASP Over-the-Air Service Provisioning (telco) OTCIXS Officer in Tactical Command Information Exchange System OTHB Over The Horizon Backscatter radar OTHR Over the horizon radar Out Voice prosign: Contact completed, going back to listening OVC overcast Over Voice prosign: Transmission completed, go ahead OVR Overcast OWF Optimum Working Frequency, realtime version of FOT OWI Office of War Information, WW II P Power (in watts) P greater than P Plus P/N Part number p/p (1)phone patch p/p (2)point-to-point p/p (3)peak -to-peak PA (1)Power amplifier PA (2)Public address system PA (3)Passenger agent PA (4)Privacy Act PAC (1)Pacific PAC (2)Personnel and Administration Center PAC (3)Political Action Committee PAC-3 Patriot Advance Capability 3 PACAF Pacific Air Force (US) PACAREA Pacific Area (USCG) PACSAT Packet radio satellite PACTOR Packet teleprinting over radio (modes 1 and 2) PAD Packet assembler/disassembler PADIL PATRIOT Digital Information Link (US missile batteries) PAL Phase Alternate Line (W. QSY (1) Frequency change QSY (2) Change frequency to -- k Hz QTC Message QTH Location of station QWD Quarterly World Days, observation intervals QWERTY Name of standard typewriter keyboard, from top row of ltrs QWZ Facetious prosign: Are you woozy?

JTF-5) JINTACCS Joint Interoperability of Tactical Command and Control Systems JIT Just In Time (JAVA Compiler, proprietary to Sun) JITC Joint Interoperability Test Command (US) JIVE Jamming and Interception Vulnerability Estimator JJ Transmission is in Japanese JJ Joprep Jiffy (obsolete SAC weather report form) JJY Japanese standard frequency & time station [~] JMC Joint movement center JMPA Joint Military Postal Agency JMRO Joint medical regulating office JOPES Joint Operations Planning and Execution System JOPREP Joint Operations Report JORN Jindalee Operational Radar Network (Australian OTH-B) JORN Jindalee OTH Radar Network JOSAC Joint Operational Support Airlift Center JOTS Joint Interoperability Targeting System JOVIAL Jules' Own Version of the International Algebraic Language, once used by USAF JP (1)Joint publication JP (2)Jumper (connection) JP4 Jet Propulsion #4 (military jet fuel) JPATS Joint Primary Aircraft Training System JPEG Joint Photographic Experts Group (lossy compression for pictures) JPL Jet Propulsion Laboratory, CA (NASA) JPNIC Japanese Network Information Center JRCC Joint Rescue Coordination Center JRTC Joint Readiness Training Center (Ft.Pierre contolo Italian Consulate, Toulouse, France CONUS continental United States conwett Italian Consulate, Wettingen, Switzerland COR (1)Carrier operated relay COR (2)Consolidated Operations Room ("Lights Out") COR Correction to a previously disseminated weather report CORES Commission Registration System (FCC) COSCOM Corps support command COSPAS Acronym for Russian SARSAT COT Changeover time COTHEN Customs Over The Horizon Enforcement Network (US) COTS Commercial Off-The-Shelf COWS Cells On Wheels (post-disaster cellphone service) CP (1)Command Post CP (2)CW general call: "Hello -- [2 or more callsigns follow]" CP/M Early Z80 operating system, might or might not have stood for "Control Program for Microcomputers," or "Control Program/Monitor." The guy who would know is dead, having narrowly missed out on being richer than Bill Gates.CPAS Cellular Priority Access Service CPCA Camp Parks Communications Annex (USAF) CPE Customer Premise Equipment (telco) CPFSK Continuous-Phase Frequency Shift Keying CPO Chief Petty Officer CPR Cardio-pulmonary resuscitation cps Cycle per second (one Hertz) CPS (2)Cellular Priority Services (US NCS) CPS (1)Characters Per Second CPT Captain (US Army) CPU Central Processing Unit (computer h/w) CPX Command Post Exercise (NATO) CQ General call: "Hello all stations" CQD "Hello All Stations, Distress," no longer used CQWW CQ World Wide (Amateur DX contest) CR Carriage Return CRC (1)Cyclic Redundancy Check (computer error test) CRC (2)CONUS Replacement Center CREN Corporation for Research and Educational Networking CRIS Communications Resource Information Sharing (US NCS) CRPLF French language: Francophonic Public Radio Community CRR Carrier CRRL Canadian Radio Relay League CRS Coastal Radio Station CRT Cathode-Ray Tube (usually a computer terminal) CRTC Combat Readiness Training Center CS (1)combat support CS (2)communication squadron CS (3)Chicken S-it CS (4)Chemical Shield (a tear gas) CSAR Combat Search And Rescue CSB Corps support battalion CSC Combat stress control CSEL Combat Survivor Evader Locator (pilot survival radio) CSG Corps support group csh C-shell, popular Unix command interpreter CSH Combat support hospital CSMA/CD Carrier Sense Multiple Access/ Collision Detection CSS (1)Combat service support CSS (2)Central Security Service (US SIGINT, run by NSA director) CSS (3)Cascading Style Sheets CSSCS Combat Service Support Control System CST (1)Central (US) Standard Time CST (2)Caribbean Support Tender CT ("Charlie Tango") - Communications Technician (on an aircraft) CTA Control Area CTAF Common Traffic Advisory Frequency CTCSS Continuous Tone Coded Squelch System ("PL") CTI Computer - Telephone Integration CTIA Cellular Telecommunications Industry Assn CTLZ Control Zone Ctrl (1)Control Ctrl (2)Computer's control key, sometimes shown with a ^ CTS Clear To Send (Serial I/O handshaking line) CU CW brevity code: "See you" CUAGN CW brevity code: "See you again" CUCV commercial utility cargo vehicle CUL CW brevity code: "See you later" CV USN Aircraft Carrier CVN US nuclear aircraft carrier CW (1)Continuous Wave (usually Morse code) CW (2)Clockwise (rotation) CWIS Campus-Wide Information System CWISP Campus-Wide Information System Protocol CWP Central West Pacific (MWARA) CZ (Panama) Canal Zone D Down D/L (1)Downlink D/L (2)Download DA (1)Directional antenna DA (2)Department of the Army DA-2 Station changes directional pattern at night (FCC) DAC (1)Digital-to-Analog Converter DAC (2)Disaster Assistance Center (FEMA) dah Morse code dash [~] DAMA Demand Assigned Multiple Access DAMSON Doppler And Multipath Sounding Network DARN (1)Dual Auroral Radar Network DARN (2)Disaster Amateur Radio Network, So Cal 440 MHz system DARPA Defense Advanced Research Projects Agency DAS Data Aquisition System DASR Digital Airport Surveillance Radar DAT Digital audio tape DB Dead body d B Decibel (1/10 Bel, a logarithmic voltage or power ratio) d BA Sound level (corrected to "A" scale d B) d Bc Decibels referenced to full-rated peak envelope power d Bd Decibel gain over dipole antenna d Bi Decibel gain over (theoretical) isotropic antenna d Bm Decibels over 1 m W into 50 ohms, usually rf, 0 d Bm = 0.316 Vp DBM (1)Doubly balanced mixer DBM (2)Data Block Message DBMS Data Base Management System DBPSK Differential Binary Phase-Shift Keying DBS Direct broadcasting satellite DC Direct Current DC1 Device Control 1 (ASCII flow control) DC2 Device Control 2 (ASCII) DC3 Device Control 3 (ASCII flow control) DC4 Device Control 4 (ASCII) DCD Data Carrier Detect (packet modems) DCE Data Communication Equipment (like a modem) DCG Deputy commanding general DCOM Distributed Component Object Module (Windoze) DCP Data Collection Platform DCPA Defense Civil Preparedness Agency, now FEMA DCR Direct Conversion Receiver ("Homodyne") DCS (1)Defense Communications System DCS (2)Disaster Communications System, amateur, from RACES DCS (3)Digital Coded Squelch DCT Direct Cosine Transform DCTN Defense Commercial Telecommunications Network DD Dual Diversity DDD Maritime preamble for relayed distress message DDN Defense Data Network DDO Dynamic Drive Overlay (used by Disk Manager on the PC) DDR Dual Diversity Receiver DDT Dynamic Debugging Tool, named for old pesticide DE Morse code prosign meaning "from" DE-QPSK Differentially Encoded Quaternary Phase Shift Keying DEA Drug Enforcement Administration (US) DEC Digital Equipment Corporation, made some nice computers DECCA Low-frequency CW phase comparison navigation DECM Deceptive Electronic Countermeasures DECnet DEC's name for networking protocols and products DECT Digital European Cordless Telecommunications DEFCON DEFense CONdition, 1-5; 5 is peace, 1 is global thermonuclear war (STRATCOM) DEMIZ DEW East Military Identification Zone DEPCON Departure Control DES Data Encryption Standard DES-FED Stronger (108 bit) DES used by US government Det Detector DEW Distant Early Warning (radar in Canada) DF (1) Direction finding DF (2) Direction finder ("duffer") DFAS Defense Finance and Accounting Service DFO Disaster Field Office DGM Digital group multiplexer DGPS-MSK Differential GPS, Minimum Shift Keying DGPS-QPSK DGPS-QPSK : Differential GPS, Quarternary Phase Shift Differential GPS, Quarternary Phase Shift Keying DHCP Dynamic Host Configuration Protocol DHTML Dynamic Hypertext Markup Language (web) DIA Defense Intelligence Agency DIG Domain Internet Groper DIGI ~ Digipeater, simplex digital repeater DII Defense Information Infrastructure DIMM Double In-line Memory Module DIMMS Double In-line Modular Memory System DIN German standards agency DIP Dual In-line Package (chips or small switches) Diplo Diplomatic traffic, usually encrypted DIS Defense Investigative Service DISA Defense Information Systems Agency DISAC Defense Information Systems Agency Circular DISC Packet control frame: Disconnect DISCO Defense Industrial Security Clearance Office DISCOM Division support command DISN Defense Information Systems Network dit Morse code dot [~] DIW Dead in the water DL (1)Download DL (2)Data Link DL (3)Driver's License (police) DLA Defense Logistics Agency DLE Data Link Escape (ASCII) DLL Dynamically Linked Library (computer programs) DLRP Data Link Reference Point, a USN authenticator DM Packet control frame: Disconnect Mode (busy) DM Delay Modulation (Miller Coding) DMA (1)Direct Memory Access DMA (2)Defense Mapping Agency DMAHTC DMA Hydrographic Topographic Center DMC Defence Management Committee (Canada) DME Distance Measuring Equipment (at airports) DMI Depot Maintenance Interservicing DMSP Distributed Mail System Protocol DMSP Defense Meteorological Satellite Program DMT Discrete Multi-Tone DMUX Demultiplexer DMZ Demilitarized Zone (Korea) DN (1)Dutch (Royal) Navy DN (2)Directory Number (telco) DND Department of National Defence (Canada) DNS Domain Naming System/Server (Internet) DO design objective DOA Dead On Arrival DOB Date Of Birth (police) DOC (1)Department of Commerce (US) DOC (2)Department Of Communication (Canadian "FCC") Do D Department of Defense (US) DOD Department of Defense Do DD Department of Defense Directive DODISS Department of Defense Index of Specifications and Standards Do DSI Department of Defense Security Institute DOE Department Of Energy (US) DOI Department Of the Interior (US) DOJ Department Of Justice (US) DOMS Director Of Military Support (MARS) DOS (1)Department of State (US) DOS (2)Disk Operating System (generic) DOS (3)MS-DOS (proprietary PC op-sys) DOS (4)PC-DOS, IBM version of above, obsolete?Maritime Satellite Org, a consortium, leases bandwidth on Marecs, Intelsat, Marisat for ship use.INMARSAT-A Inmarsat mobile voice/data terminal INMARSAT-B Improved version, replaced A INMARSAT-C Data-only INMARSAT terminal, also for SAFETYnet INMARSAT-E INMARSAT EPIRB INMARSAT-M INMARSAT terminal, voice only, not GMDSS-compliant INO Indian Ocean (MWARA) INS (1)Immigration & Naturalization Service (US) INS (2)Inertial Navigation System INSCOM US Army Intelligence and Security Command INSCOM Intelligence and Security Command Int International, interrupted, interrupt intel intelligence Internet Global interconnection of regional nets using TCP/IP Inter NIC Internet Network Information Center INTERPOL International Criminal Police Organization Intl International, internal IOC Index of co-operation (a fax parameter) IOM Installation, operation and maintenance IONCAP Ionospheric Communications Analysis and Prediction, original prediction algorithm, still used IOR Indian Ocean Region IOS Indian Ocean Station (NASA) IP Internet Protocol IPA Intermediate power amplifier IPI Intelligent Peripheral Interface IPng IP next generation IPS Inches per second IPS Ionospheric Prediction Service (Australia, original name for space weather agcy) IPSS International Packet Switch Stream, now GNS (UK) IPT Integrated Program Team IPX Internetwork Packet Exchange (Novell) IQSY International Year of the Quiet Sun, 1960's research interval IR (1) Infrared IR (2) Instrument route (numbered military training route) IRA International Reference Alphabet IRAC Interdepartment Radio Advisory Committee (part of US NTIA) IRBM Intermediate Range Ballistic Missile IRC (1)International Reply Coupon IRC (2)Internet Relay Chat, world's primo time waster IRC (3)International Red Cross IRC (4)Incrementally Related Carrier (CATV channel scheme) IRE Institute of Radio Engineers, now IEEE IRI Ionospheric Research Instrument, transmitter part of HAARP IRINT Infrared intelligence IRIS Improved Radio Ionospheric Sounder IRQ Interrupt request (computer hardware) IRS (1)Information Receiving Station (SITOR) IRS (2)Internal Revenue Service (US) IRS (3)Infernal Revenue Service (U$) IRS Information Receiving Station IS (1)Interval signal IS (2)Intermediate Standard, formerly RS ISA (1)Industry Standard Architecture (PC-AT bus) ISA (2)In-Session Activation (telco) ISABPS Integrated Submarine Automated Broadcast Processor System ISAM Indexed Sequential Access Method ISB (1)Independent Sideband ISB (2)Intermediate Staging Base ISC Initial Scope Command (phase I) ISD Inverted Scanning Direction (radiofax) ISDL ISDN Digital Subscriber Line ISDN Integrated services & data network (telco) ISF International Science Foundation ISMLS Interim Standard Microwave Landing System ISO International Organisation for Standardisation ISODE ISO Development Environment ISP Internet service provider ISR In-System Reprogrammable ISS (1)Information Sending Station (SITOR) ISS (2)International Space Station ISSO Information Systems Security Organization (US) ISTR I Seem To Recall ITA International Telegraph Alphabet ITA1 International Telegraph Alphabet #1 (Old cablegrams, obsolete) ITA2 International Telegraph Alphabet #2 (Baudot double-shift) ITA3 International Telegraph Alphabet #3 (7-bit ARQ) ITA4 International Telegraph Alphabet #4 (FM VFT) ITO Installation transportation office ITS Institute for Telecommunication Sciences ITU International Telecommunications Union ITU-R ITU Sector for Radiocommunications, old CCIR ITU-T ITU Sector for Telecommunications, old CCITT ITU-T International Telecommunications Union - Telecommunication Standardization Sector ITU-TSS ITU Telecommunications Standards Section, old CCITT IUGG International Union of Geodesy and Geophysics IUWDS International Ursigram and World Days Service IVAS Inward Voice Activated Services (telco) IVTT Integrated VERDIN Transmit Terminal IWTS Integrated Terminal Weather System J/S Jamming to signal ratio J2 Intelligence directorate at a joint headquarters J3E Single sideband, suppressed carrier AM radiotelephony (emission designator) J4 Logistics directorate at a joint headquarters JAA Joint Aviation Authorities (Europe) JAFO Just Another F[ine] Observer JAN Joint Army/Navy (spec) JANA Jamahiriyah News Agency JANET Joint Academic NETwork (UK) JAR Joint Aviation Requirements (Europe) JASORS Joint Advanced Special Ops Radio System JASORS Joint Advanced Special Operations Radio System JATACS Joint Advanced Tactical Command and Control System JATCC Joint Air Traffic Control Center JAWSAT Joint Air Force-Weber State University Satellite JCS Joint Chiefs of Staff JCSE Joint Communications Support Element JDF Japanese Defense Force JDISS Joint Deployable Intelligence Support System JEDEC Joint Electronic Device Engineering Council Jeep Believed from "General Purpose" military vehicle, now a tradename JFC Joint force commander JFET Junction Field-Effect Transistor JIATF-E Joint Interagency Task Force, East (incorporates JTF-4) JIATF-S Joint Interagency Task Force, South (inc.Polk, LA) JSC Johnson Space Center, TX JSC Joint Spectrum Center JSF Joint Strike Fighter JSMSw Joint Spectrum Management Spectrum for Windows (software) JSORS Joint Advanced Special OPS Radio System JSTARS Joint Surveillance Target Attack Radar System, aka "Joint STARS," aircraft heard on HF during Haitian operation JTF Joint Task Force, usually US "War on Drugs" JTF-4 Caribbean drug interdiction unit, out of Key West, part of JIATF-E JTF-5 Pacific coast drug unit, part of JIATF-W JTF-6 South & Central America drug unit, part of JIATF-South JTFEX Joint Task Force Exercise JTIDS Joint Tactical Information Distribution System JU JTIDS Unit (net member, like a "PU" in Link-11) JUH-MTF Joint user handbook for message text format JWICS Joint Worldwide Intelligence Communications System K (1)1024 (decimal) of anything (loosely from hexadecimal) K (2)CW prosign: "Go Ahead," technically an "Invitation To Transmit" k A thousand of anything, in decimal (short for kilo) K Index Logarithmic, 3-hourly geomagnetic activity reading k/c Kilocycles K/cs Kilocycles per second = kilo Hertz KA9Q Packet radio protocol, from callsign of its inventor [~] KAM Kantronics All-Mode (packet/digital controller) KAWN Identifier attached to AWN weather products, as relayed by several HF stations KB Keyboard k B Kilobit, kilobaud kb/s kilobits per second KBD Keyboard k Bd Kilobaud Kbps Kilobits per second kc Kilocycles per second, now k Hertz KCNA Korean Central News Agency kcs Kilocycles per second, now k Hertz KGB Komitet Gossudarstwennoy Besopasnostij (transliterated from Russian by Klingenfuss), old USSR comint, replaced by FAPSI KH Keyhole, optical recon satellite, KH-12 resembles Hubble k Hz Kilo Hertz KISS Keep it simple, stupid (packet radio mode/engineering golden rule) km kilometer k Mc Kilo-megacycle, now gigahertz knot Nautical mile/hour [~] KNRM Koninklijke Nederlandse Redding Maatschappij (Dutch SAR org.) Kp Planetary K index kph kilometer per hour KSC Kennedy Space Center, Cape Canaveral, FL KSCPAO Kennedy Space Center Public Affairs Office (NASA) ksh Korn shell (Unix) KSR Keyboard Send-Receive kt knot (nautical mile per hour) KT knots Ku-band 12-18 GHz microwave band k V Kilovolt KVA Kilo Volt-Amp(s); can k W in highly reactive circuit k W Kilowatt L Inductance (in Henrys) L left (with reference to runway designation) LA Low altitude Ladar Laser Radar LAN Local Area Network LANL Los Alamos (NM) National Laboratory LANTAREA USCG Atlantic Area LAPD (1)Link Access Procedure D-Channel LAPD (2)Los Angeles Police Department, famous organized crime family LAPM Link access protocol for modems LASER Light Amplification by Stimulated Emission of Radiation LAST last observation before a break in coverage at a manual station LBA Logical Block Addressing (Disk access) LC Limited Coastal (service) LCAC Landing Craft, Air-Cushioned (large hovercraft) LCC Launch Control Center LCD Liquid Crystal Display LCMP Atlantic Composite Broadcast LCP Link Control Protocol (PPP) LCS Limited Coastal Station LCU Landing Craft, Utility (US Army) LDAP Lightweight Directory Access Protocol LDF Lightweight digital facsimile LDOC Long Distance Operational Control (civil aviation) LDP Landing Decision Point LDR (1)Low Data Rate LDR (2)Loader LDTWA Long Dual Trailing Wire Antenna (TACAMO) LEARN Law Enforcement Amateur Radio Network LEASAT Leased Satellite (US military comm) LED Light Emitting Diode LEO Low Earth Orbit ("Little LEO" = a data satellite) LES Land Earth Station LF (1)Low Frequency (30-300 k Hz) LF (2)Linefeed LFO Low frequency oscillator LG Logistics Group LHCP Left-hand circular polarization Lidar Light Detection & Ranging (light "radar") LIM (1)Lotus/Intel/Microsoft, original spec for PC extended memory LIM (2)Line interface module LINCOMPREX Link Compression and Expansion, an ACSB system LIRL Low Intensity Runway Lights LL Landline, "Lima Lima" LLC (1)Logical Link Control LLC (2)Limited Liability Corporation (US) LLNL Lawrence Livermore National Laboratory LLP Limited Liability Partnership (US) LLWAS Low Level Wind Shear Alert System LMAO Laughing My A-- Off (Internet) LMCC Land Mobile Communications Council LO Local oscillator (of a receiver) LOC (1)lines of communication LOC (2)location LOGCAP Logistics Civil Augmentation Program LOGPAC Logistics package LOI Low Opportunity of Intercept LOJACK Vehicle locator beacon activated & DF'd by police LOL Laughing Out Loud (internet) LORAC LOng Range Long Range Accuracy (NASA booster recovery) LORAN Long Range Navigation LOS (1)Loss Of Signal LOS (2)Line of sight LOTS logistics-over-the-shore LP (1)Long Playing (old records) LP (2)Low pass (filter circuit) LP (3)Linking Protection (US mil ALE security) LPB Logistics preparation of the battlefield LPD Line Printer Daemon LPFM Low-Power FM (broadcasting) LPI Low Probability of Intercept LPM Lines per minute LPR Line Printer LPRS Low-Power Radio Service (FCC) LPT Logistics preparation of the theater LPTV Low-Power TV (broadcasting) LQA Link Quality Analysis (databursts heard from ALE radios) LRA Landing Rights Airport LRC Longitudinal Redundancy Check (computing) LRCOC Long Range Company Operational Control LSB Lower Sideband LSDIS Light and Special Division Interim Sensor (US Army) LSE Logistics support element LSI Large scale integration (of chips) LST (1)Landing ship, tank LST (2)Local Standard Time LSV Logistic Support Vessel (US Army) LTG lightning LTR Letter(s) LTRS Letters case (Baudot lower case) LUF Lowest Usable Frequency (varies with path) LUT Local User Terminal LWR lower LZW Lempel-Ziv-Welch, lossless compression algorithm for data M Mega, meg, a million of anything, or 1,048,576 bytes (hex) m Meter (39.37 inches) M minus, less than M Minus (Below zero C) M-JPEG JPEG used for moving pictures (cf JPEG, MPEG) M/S Motor Ship (also MS, M.

S.) m/v Motor Vessel (also MV) M/V Motor Vessel (also m/v) m A milliamperes Mac Macintosh (computer) MAC (1)Military Airlift Command, now AMC MAC (2)Media Access Control (computer networks) MACOM Major command Mac TCP TCP/IP package for Macintosh MAFFS Modular Airborne Fire Fighting System (tank for C-130) MAFOR Maritime weather forecast MAGIS Marine Air-Ground Intelligence System MAN Metropolitan Area Network, halfway between a LAN and a WAN MANPAD Man-Portable Air Defense MAP Maghreb Arabe Presse MAPI Mail/Messaging Applications Programming Interface MAPS Mail Abuse Prevention System (Internet) MARC MAchine Readable Catalog MARO Maritime Air Radio Organization MARS Military Affiliate Radio System (US) MARSA Military Assumes Responsibility for Separation of Aircraft MASER Microwave Amplification by Stimulated Emission of Radiation MASH mobile army surgical hospital, may be obsolete MASM Macro-Assembler (computer code) MATS Military Air Transportation Service, became MAC, now AMC MAU Media Attachment Unit, a network transceiver MAYDAY Prosign: Distress traffic follows; repeated 3 times [~] mb millibar MB Megabyte MBDL Missile Battery Data Link MBKS Multi-Button Key Set (telco) MBO Mailbox MBONE Multicast Backbone Mbps Megabytes per second MBR Master Boot Record ("boot sector") MCA Movement control agency MCC Master Control Center MCC Movement control center MCFB Multi-Channel Fleet Broadcast MCM Mine Countermeasures MCP Multimode Communications Processor (packet) MCS Mission Communications System MCS/P Maneuver Control System/Phoenix (US Army) MCVFT Multichannel Voice Frequency Telegraph (multiplex RTTY) MDT (1)Mobile Data Terminal (usually police) MDT (2)Mountain Daylight Time, US zone includes Rockies med medical MEDAFS Mine Warfare Environmental Data Analysis and Fusion System MEDCOM Medical command MEDICAL Voice prosign attached to c/s of vessel with emergency medical supplies or patients, pronounced MAY-DEE-CAL MEDICO Emergency Medical Communications MEDLOG Medical logistics MEL Maximum Elevation (of a spacecraft) MEMA Massachusetts Emergency Management Agency MERS Mobile Emergency Response Support (FEMA) MET Meterological Met Office Weather office at a base METAR Meteorological observation code for routine aviation METAREA Meteorological Area, same as a NAVAREA (see WMO) METARS Plural of METAR Meteo Meteorological METOC Meteorological and Oceanographic Metro Meteorological office METSAT Meterological Satellite MF (1)Medium Frequency (300-3000 k Hz) MF (2)Multifrequency MFA Ministry of Foreign Affairs MFD Modulated Fractional Division MFM Modified Frequency Modulation (Miller Coding) MFSK Multiple Frequency Shift Keying mgt management MHD Magnetohydrodynamics; behavior of plasmas in magnetic fields, such as the ionosphere and sunspots MHE materials-handling equipment MHS Message Handling System MHz Mega Hertz mi mile (1.6 km) MI Military intelligence, especially in UK MI shallow MI5 Directorate of Military Intelligence, group 5 (domestic) MI6 Directorate of Military Intelligence, group 6 (foreign, aka SIS) MIB Management Information Base MID (1)Middle East (MWARA) MID (2)Maritime Identification Digits, country code prepended to MMSI MID Maritime Identification Digit MIDS Multifunctional Information Distribution System MIFG Shallow Fog MIJI Meaconing, Intrusion, Jamming & Interference ("Jammer writeup") Mil (1) Military Mil (2) Milliampere MIME Multipurpose Internet Mail Extensions, allows attachment of binaries to letters MIMS Medical Information Management System min Minute MINIMUF Miniature Maximum Usable Frequency calculator, classic BASIC MUF prediction algorithm MINREX Ministerio de las Relaciones Exteriores (Cuban news agency) MIR Not an acronym; transliteration of Russian for "Peace" MIREX Mir Experiment, amateur robot packet station on Mir MIRL Medium Intensity Runway Lights MIT Massachussetts Institute of Technology mkr Marker ML Machine language, how computers store instructions MLB Motor Lifeboat MLS Microwave Landing System MLSO Mauna Loa Solar Observatory MLT Magnetic Local Time MM Maritime mobile mm Millimeter MMC materiel management center MMS Maritime Mobile Service MMSI Maritime Mobile Service Identity (code for DSC) MMX Multimedia extensions (microprocessor architecture) MNCS Master Net Control Station MNP Modem Network Protocol MOA Military Operation Area Mob Mobile MOC (2)Ministry Of Commerce (Canada) MOC (1)Mission Operation Center MOCA Minimum Obstruction Clearance Altitude Mod Modification (to radio) Mo D Ministry of Defence (UK) Mode A SITOR-A (ARQ) Mode B SITOR-B (FEC) Modem Modulator/Demodulator MOOTW Military operations other than war MOP Measure Of Performance MOPP mission-oriented protection posture (0-4, 4 being full suit) MOS Metallic Oxide Silicon MOSFET MOS Field Effect Transistor MOSS MIME Object Security Services MOTD Message Of The Day MOTIS Message Orientated Text Interchange Service, ISO version of MHS MOV moved/moving/movement MOX Manually Operated Switching MP (1)Military Police (US) MP (2)Member of Parliament (UK) MP (3)Multiprocessor (computer h/w) MP Magnetopause MP3 MPEG Level 3, CD-quality compression scheme MPEG Motion Picture Expert Group, lossy compression for video mph mile per hour MPSA Military Postal Service Agency MPSAP Mobile Public Safery Answering Point MPX Multiplex MR Magnetoresistive MRB Marine Radio Beacon MRC Mobile Radio Communications MRCC Maritime Rescue Coordination Center MRE meal, ready-to-eat MRO medical regulating office MRS Mountain Radio Service MRT Mountain Rescue Team ms millisecond MS Motor Ship MS Master Station MSB main support battalion MSC Military Sealift Command MSC Military Seaflift Command (US) MSE mobile subscriber equipment MSF English standard frequency & time station MSFC NASA Marshall Space Flight Center msg Message MSI Maritime Safety Information MSI Marine Safety Information MSI Maritime Safety Information MSIS Mass Spectrometer Incoherent Scatter (research) MSR main supply route MSS Mobile Satellite Service MST (1)Mountain (US) Standard Time, zone includes Rockies MST (2)Maintenance support team MT Monitoring Times (**the bible**) MT mountains MTA Message Transfer Agent MTBF Mean Time Before Failure MTF medical treatment facility MTI Moving Target Indicator MTMC Military Traffic Management Command mtr Meter, either distance unit or measuring device MTU Maximum Transmit Unit (TCP/IP packet length) MUF Maximum Usable Frequency (varies with path) MUX Multiplex, multiplexer m V Millivolt MV Motor Vessel MVS Multiple Virtual Storage (large IBM computers) MW (1)Medium Wave (typically 530-1710 k Hz) MW (2)Mega Watt m W Milli Watt MWARA Major World Air Route Area MWP Meteorologist Weather Processor MWR Morale, welfare, and recreation mx Music MX Mail Exchange Record MYM My Mailbox (packet) MYP Personal Mailbox (packet) N north N No Change N-ISDN Narrowband ISDN N/A not applicable N0N Unmodulated, steady carrier, old "A0" NA (1)North America NA (2)Not applicable, N/A NA Not authorized NAAS Naval Auxiliary Air Station NAB (1)National Assn of Broadcasters NAB (2)Naval Amphibious Base, USN, Coronado, CA (SEALs train there) NABER National Association of Business/Emergency Radio NADC Naval Air Development Center NADEP Naval Air Depot NADGE NATO Air Defence Ground Environment NAEC Naval Air Engineering Center NAF Naval Air Facility (US) NAFB National Assn of Farm Broadcasters NAK Negative Acknowledgment (error in received data, ASCII 21d) NALF Naval Auxiliary Landing Field NALO Naval Air Logistics Office NAM Number Assignment Module (Cellular) NANP North American Numbering Plan (telco) NAOC National Airborne Operations Center, aka Nightwatch, old NEACP NARTE Natl Assn of Radio & Telecommunications Engineers NARTEL North Atlantic Radiotelephone NAS (1)Naval Air Station NAS (2)National Academy of Sciences (US) NASA (1)National Aeronautics and Space Administration NASA (2)National Acronym Slinging Agency NASTD National Association of State Telecommunications Directors NAT (1)North Atlantic (MWARA) NAT (2)Network Address Translation NATO North Atlantic Treaty Organization NAV Navigation NAV/COMM Airplane Navigation/Communication radio NAVAID Navigational aid NAVAREA Navigational Area (IMO/IHO) NAVCEN USCG Navigation Center, VA NAVMARCORMARS Navy/Marine Corps Military Affiliate Radio Service (US) NAVMTO Navy Material Transportation Office NAVSAT NAVigation SATellite NAVTEX Navigational Telex, Navigational Text (518 k Hz SITOR-B) NAWC Naval Air Warfare Center NAWC-WPN Naval Air Warfare Center NAWCAD Naval Air Warfare Center Aircraft Division NAWS (1)Naval Air Weapons Station NAWS (2)Old group call: Notice to Allied Warships NB Narrowband NB Noise blanker NBC (1)Nuclear, Biological, Chemical (warfare) NBC (2)National Broadcasting Company NBDP Narrowband direct printing (RTTY) NBDPT Narrowband direct printing telegraphy NBF Net BIOS Frames NBFM Narrowband frequency modulation NBR Narrowband Receiver NBS National Bureau of Standards, now NIST NBSV Narrowband Secure Voice NBSVS Narrowband Secure Voice System NCA (1)North Central Asia (MWARA) NCA (2)National Command Authorities, US nuclear "button" NCAR National Center for Atmospheric Research, CO NCC National Coordinating Center for Telecommunications (US NCS) NCCOSC Naval Command, Control and Ocean Surveillance Center NCDC National Climatic Data Center NCEM National Coordinating Council for Emergency Management, now IAEM NCFSK Non-Coherent Frequency Shift Keying NCIC National Crime Information Center, US database of police records NCO Non-Commissioned Officer NCPi Netware Core Protocol NCR National Cash Register NCS (1)National Communications System, US government NCS (2)Net Control Station NCS (3)Naval Communications Station NCS (4) Network Coordinating Station NCSA National Centre for Supercomputing Applications, developed Mosaic web browser, which became Netscape (Mozilla) NCTSI Navy Center for Tactical Systems Interoperability (US) ND Nondirectional NDB Nondirectional beacon NDIS Network Driver Interface Specification NDS NUDET Detection System, see NUDET NE Northeast NEACP National Emergency Airborne Command Post, "kneecap," now NAOC NECN National Emergency Coordination Network NERC North American Electric Reliability Council (bulk power delivery) NERK Old CW group call, obsolete NESDIS National Environmental Satellite, Data and Information Service NEST Nuclear Emergency Search Team ("Flynest") NET/ROM Network packet radio protocol Net BEUI Net BIOS Extended User Interface Net BIOS Network Basic Input/Output System NFCC National Frequency Coordinators' Council NFR Navy Fleet Relay (USN secure satcom) NFS Network File System NGO Nongovernmental organization NHC National Hurricane Center NIC (1)Network Interface Card NIC (2)Network Information Center Ni Cad Nickel Cadmium (battery) Ni Cd Nickel Cadmium (battery) NICP National inventory control point NIEX No-Notice Interoperability Exercise (NATO) NIFC National Interagency Fire Center (US forest fire resources) NIFTP Network Independent File Transfer Protocol NIL CW prosign: "No traffic" or "I copy nothing" NIMBY Not In My Back Yard (place people want radio towers) Ni MH Nickel-metal hydride (battery) Ni Mh Nickel-Metal-Hydride (battery) NIMS Naval Ionospheric Measuring System (UK) Niner Number nine, to distinguish from five NIPRNET Non-Classified Internet Protocol Router Network (sensitive military net) NIS Network Information System NISO National Information Standards Organisation (US) NISP Networked Information Services Project (UK) NISS National Information on Software and Services (UK) NIST National Institute of Standards & Technology (old NBS) NLM Netware Loadable Module (extension of Novell Netware) NLSP Netware Link Services Protocol nm Nautical Mile; about 1.24 statute miles Nm Nautical Mile (1.85 km) NMA US Coast Guard COMMSTA, Miami, now controlled from CAMSLANT NMC (1)National Meteorological Center NMC (2)Call of US Coast Guard CAMSPAC Pt Reyes, CA NMEA National Marine Electronics Assn NMF US Coast Guard COMMSTA, Boston, will be ctld from CAMSLANT NMG US Coast Guard COMMSTA, New Orleans, will be ctrld from CAMSLANT NMN US Coast Guard CAMSLANT Chesapeake, VA NMO US Coast Guard COMMSTA, Honolulu NNCC National Network Control Center (FAA) NNE North-northeast nnnn RTTY/Telex ending characters NNTP Network News Transfer Protocol (USENET) NNW North-northwest NOAA National Oceanic & Atmospheric Administration NOC Network Operation Center NOE Nap-Of-the- Earth (low altitude attack) NOI Notice Of Inquiry (FCC rulemaking) NOJ US Coast Guard COMMSTA, Kodiak NORAD North American Aerospace Defense Command NORDO (1)No Radio NORDO (2)Aircraft has no radio (uses visual signals to tower) NORLANT North Atlantic norm normal NOS (1)Amateur version of TCP/IP (Internet protocols) NOS New, Old-Stock (wine or vacuum tubes) NOS (2)National Ocean Service NOSC Naval Ocean Systems Center, San Diego, CA, now NCCOSC NOSIG No Significent Weather NOSPECI no SPECI reports are taken at the station NOTAM Notice to Airmen NP North Pacific (MWARA) NPA Notice of Proposed Amendment NPN Negative/Positive/Negative; transistor type NPR National Public Radio (US) NPRM Notice of Proposed Rule Making (FCC) NPS National Park Service (US) NPSTC National Public Safety Telecommunications Council NRa D Naval Research and Development (US) NRAO National Radio Astronomy Observatory NRC (1)National Radio Club NRC (2)Nuclear Regulatory Commission (US) NREN National Research and Education Network, faster Internet successor for research sites NRI Net radio interface NRL Naval Research Laboratory (US) NRO National Reconnaissance Office (operates US spy satellites) NRV US Coast Guard COMMSTA, Guam, controlled from CAMSPAC NRWATS Naval Rotary Wing Aircraft Test Squadron NRZ Nonreturn to Zero NRZL Return To Zero Level NRZM Nonreturn To Zero Mark NRZS Nonreturn To Zero Space NS Node switch NS/EP National Security/ Emergency Preparedness NSA (1)National Security Agency (US intercept and crypto) NSA (2)No Such Agency (NSA used to "not exist") NSA (3)Never Say Anything (NSA secrecy policy) NSAP Network Service Address Point NSAWC Naval Strike and Air Weapons Center (replaces "Top Gun") NSE National Support Element NSF National Science Foundation (US) NSFNET National Science Foundation Network, old Internet backbone NSK Narrowband shift keying NSTAC National Security Telecommunications Advisory Committee (US) n T Nanotesla (unit of magnetic flux=1n Weber/m) NT Not Tested NTA (1)National Telecommunications Alliance (NCS) NTA (2)National telecom administration (ITU member bodies) NTCN National Telecommunication Coordination Network NTIA National Telecommunications and Information Administration NTM Notice to Mariners NTMS National Telecommunications Management Structure (national emergency plan) NTN NATO Track Number NTS (1)National Traffic System, amateur message network NTS (2)Naval Telecommunications System NTSC (1)National Television Standards Committee (US TV standard) NTSC (2)Never The Same Color (result of using above) NTT Nippon Telegraph and Telephone (Japanese "FCC") NUC Nuclear NUCINT Nuclear Intelligence NUCO Numerical Code (US Navy) NUDET Nuclear detonation NUKO Old group call: To All Ships Receiving MERCAST NUL Nothing (ASCII 0000) NVG Night-Vision Goggles NVIC Navigation & Vessel Inspection Circular NVRAM Nonvolatile Random Access Memory NW (1)CW brevity code: "Now," or "New" NW (2)Northwest NWR NOAA Weather Radio NWS (1)National Weather Service (US) NWS (2)Naval Weapons Station NWSFO National Weather Service Forecst Office nx News NYSEMO New York State Emergency Management Office O&O Owned & Operated (by broadcast network) o/l Online O/R On request O/R Address Originator/Recipient Address O/S Out of service OARNET Ohio Academic Resources Network OASD/C3I Office of the Assistant Secretary of Defense for command, control, communications and intelligence OBS Ship weather report in standard form OCA Oceanic Control Area OCC Operations Control Center (Centre) OCD (1)Office of Civilian Defense, obsolete OCD (2)Operations Control Division OCNL occasional OCONUS Outside Continental United States OCOT Office of the Chief of Transportation (US Army) OCR (1)Optical Character Recognition OCR (2)Optically Coupled Regenerative OD (1)Officer of the Day OD (2)Overdose ODBC Open Data Base Connectivity (Microsoft) ODMP Orbiter Maintenance Down Period (NASA) OE Operating Expense OEI One Engine Inoperative OEM Original Equipment Manufacturer OFCM Office of the Federal Coordinator for Meteorology OFP Operational Flight Program OG Operations Group OHD overhead OIC Officer In Charge OLF Outlying Landing Field (US Navy) OLTP On-Line Transaction Processing (IBM) OLX OLE Custom Control (MS made it up... QRM Interference QRN Noise QRO (1)High power operation QRO (2)Please increase power QRP (1)Low power operation QRP (2)Please reduce power QRP (3)Quick Reaction Package (US Army vehicle) QRQ Please increase code sending speed QRR Old land distress call, now SOS, MAYDAY, or QRRR QRRR Old land distress call QRS Please reduce transmission speed QRT (1)Station has ceased transmitting QRT (2)Please cease transmitting QRU I have no traffic for you QRU? QRV I am ready (go with your traffic) QRX Please standby QSA Signal strength QSB Fading QSD Your keying is defective QSK Duplex CW ("break-in") QSL (1)A card or letter confirming reception of a radio station QSL (2)Acknowledgment of transmission, a fancy "roger" QSO Communications between two or more stations QST (1)General call: "Hello all amateurs" QST (2)Ham radio magazine published by ARRL QSTAG Qadripartite Standardization Agreement QSV Send Vs QSX I am listening on...

"MCW" A3 (Alpha-3) Status: write up critical system; mission aborted A3E AM voice or broadcasting AA CW prosign: "[repeat] all after" AAA Anti-aircraft artillery AAAS American Association for the Advancement of Science AAB Automatic Answer-Back (RTTY) AABCP Advanced airborne command post AAF (1)Auxiliary Airfield AAF (2)Army Air Forces, obsolete AAFES Army and Air Force Exchange Service AAIC Accounting Authority Identification Code AAL ATM Adaptation Layer AAL-1 Synchronous adaptation layer designed for carrying voice trunk lines AAL-2 Adaptation layer intended for variable bit rate video, but never really got off the ground and is not offered by vendors AAL-3/4 Adaptation layer intended to be used by Frame Relay and SMDS and other delay-insensitive variable rate or bursty data traffic, but mostly now passed over in favour of AAL-5 AAL-5 'Simple and efficient adaptation layer' for computer networking AALC (1)Amphibious Assault Landing Craft AALC (2)Amplified automatic level control AAMSS Arinc Aeronautical Mobile Satellite Service (proposed; would replace much of MWARA) AARS Army Amateur Radio System, started 1925, now part of MARS AAV Assault Amphibious Vehicle AB Air Base AB CW prosign: "[repeat] all before" ABC (1)Atomic, Biological, Chemical (warfare) ABC (2)American Broadcasting Company ABCA American, British, Canadian, Australian ABCC Airborne battlefield command and control center ABCCC Airborne Command Control Center ABCS Army Battle Command System ABM Anti-Ballistic Missile ABN Airborne ABNCP Airborne National Command Post AC (1)Alternating Current AC (2)Active Components (US Army) AC&I Acquisition, Construction & Improvement ACA Airspace control authority ACA Australian Communications Authority ACAA Automatic chemical agent alarm ACAP Application Configuration Access Protocol (computing) ACAPS Area communications electronics capabilities ACARS Aircraft Communications Addressing and Reporting System ACC (1)Air Combat Command (US) ACC (2)Area Communication Center ACC altocumulus castellanus ACCHAN Allied Command Channel ACERT Army Computer Emergency Response Team ACFT MSHP aircraft mishap ACINT Acoustic intelligence ACJ Advisory Circular, Joint ACK Positive Acknowledgment (ASCII 06) ACLS Automatic Carrier Landing System ACM Association for Computing Machinery ACMI Air Combat Maneuvering Instrumentation ACOM U. Atlantic Command ACP Allied Communication Publication ACR Armored cavalry regiment ACS Assistant chief of staff ACSB Amplitude Compandored Side Band ACSL altocumulus standing lenticular cloud ACTD Advanced Concept Technology Demonstration ACTS Automated Computer Time Service ACW Air Control Wing (like 552nd AWACS at Tinker) ADA (1)Americans with Disabilities Act ADA (2)"Official" Do D computer language, not an acronym, named for Ada Babbage, the world's first programmer ADAS AWOS Data Acquisition System (Nice nested acronym) ADC Analog-to-Digital Convertor ADCC Air Defense Control Center addr Address ADES Airdrop equipment and systems ADF (1)Automatic direction finding ADF (2)Australian Defence Forces ADIZ Air Defense Identification Zone ADM Admiral ADMD Administration Management Domain ADO Active X Data Objects ADO Active Data Objects ADOC Air defense operation center ADONIS Article Delivery Over Network Information Systems ADP Automated data processing ADPCM Adaptive differential pulse-code modulation ADPE Automated Data Processing Equipment ADPSIS Automated Data Processing Software Inventory System ADPSO Automated Data Processing Security Officer ADPSSO Automated Data Processing System Security Officer ADR CW brevity: address ADS Automatic Dependent Surveillance ADS-B Automated Dependent Surveillance-Broadcast ADSL Assymetric Digital Subscriber Line Ae Auroral Electrojet magnetic activity index AF (1) Air Force AF (2) Audio Frequency (30 Hz - 30 k Hz) AFAMPE Air Force Automated Message Processing Exchange AFATDS Advanced Field Artillery Tactical Data System AFB Air Force Base AFC Automatic frequency control AFCA Air Force Communications Agency (US) AFEPS ACARS Front-End Processor System (ground computer network) AFETR Air Force Eastern Test Range AFFSA Air Force Flight Standards Agency AFGWC Air Force Global Weather Central at Offutt AFB, NE AFI (1)Africa/Indian Ocean (MWARA) AFI (2)Air Force Instruction (official directive) AFI (3)American Film Institute AFN American Forces Network (US broadcast for military) AFNET Air Force Integrated Telecommunications Network AFR Armed Forces Radio AFRES Air Force Reserve (US) AFRN Armed Forces Radio Network AFRTS Armed Forces Radio & Television Services AFS (1)Air Force Station AFS (2)Aeronautical Fixed Service AFSATCOM Air Force Satellite Communications AFSK Audio frequency-shift keying AFSOC Air Force Special Operations Command AFTCO Air Force Telecommunications Certification Office AFTN Aeronautical Fixed Telecommunication Network AG Adjutant general AGC Automatic gain control AGE Aerospace Ground Equipment (pronounced like how old you are; when you replace it you order New Age) AGL Above ground level AGU American Geophysical Union AHAMSL Antenna height above mean sea level AHF Adaptive High Frequency AHMSL Antenna height above mean sea level AHP Army Heliport AI Artificial intelligence AIC Air Intercept Control AICPITS All India Coordinated Program of Ionosphere & Thermosphere Studies AIDA Atmospheric Investigations of Dynamics over Arecibo AIDC Automatic Identification and Data Capture AIM AOL Instant Messenger (popular internet talk program) AIN Advanced Intelligent Network (US NCS) AIR (1)All-India Radio AIR (2)Aviation Incident Response (Red Cross) AIREP Air Report; weather observation, like a PIREP AIRK Area interswitch rekey AIRMET Air Meteorological Information AIS (Universal) Automated Identification System AJ Anti-Jam Ak DT Alaskan Daylight Time, US Ak ST Alaskan Standard Time, US AL Approach and landing ALC (1)Automatic level control ALC (2)Air logistics center ALCC Airborne Launch Control Center ALCE Airlift Control Element ALCS Airborne Launch Control System ALE Automatic Link Establishment ALERT Attack & Launch Early Reporting to Theater ALF Absorption Limiting Frequency, realtime version of LUF Al Ga N Aluminum-Gallium Nitride ALOC Air lines of communication Aloha Wide-area net protocol, developed at U of Hawaii ALP airport location point Alpha # Aircraft maintenance status (1 is best) Alpha Hotel A-- H--- (also Adam Henry) ALQA Active Link Quality Assesment ALS Airlift squadron ALU Arithmetic Logic Unit (computer h/w) ALW Airlift Wing AM (1)Amplitude Modulation AM (2)Aeronautical Mobile AM (3)Ante Meridian, hours between midnight and local AMC (1)Air Mobility Command (old Air Force MAC, MATS) AMC (2)Army Materiel Command (US) AMCO Aircraft maintenance company AMD American Micro-Devices (with Cyrix, Intel's competition) AMD Automatic Message Display AME Amplitude modulation equivalent AME Automatic Message Exchange AMI Alternate Mark Inversion AMMCS Airborne Multimedia Multiservices Communication System AMP Antenna Maintenance Program AMSA Australian Maritime Safety Agency AMSAT Radio Amateur Satellite, Inc.

AMTOR Amateur Teleprinting Over Radio (Ham SITOR) AMVER Automated Mutual Assistance Vessel Rescue System AN Army/Navy (prefix on US military type designators) AN/FRT Army/Navy Fixed Radio Transmitting AN/GRC Army/Navy General Radio Communication AN/MRC Army/Navy Mobile Radio Communication ANARC Assn.

DOS (5)Denial of Service (attack) DOT Department of Transportation (US) DOW Doppler On Wheels (storm chasing radar equipment) DPG Defense Planning Guidance DPSK Differential Phase-Shift Keying dpx Duplex DQPSK Differential Quadrature Phase-Shift Keying DR low drifting DRAC Dynamic Relay Authorisation Control DRAM Dynamic Random Access Memory DRE Drug Recognition Expert DRFMU Digital Radio Frequency Memory Unit DRSN Defense RED Switch Network DS Direct support DS Dust storm DSA Division support area DSB Double sideband DSC Digital Selective Calling (GMDSS) DSL Digital Subscriber Line DSLAM Digital Subscriber Line Access Multiplexer DSM Digital Switching Module DSN Defense Switched Network (old AUTOVON) DSNT distant DSOR Depot Source of Repair DSP Digital signal processing DSR Data Set Ready (Serial I/O primary handshaking line) DSS Digital Satellite System Dst Disturbance Storm Time, equatorial magnetospheric activity index DSTO Defence Science & Technology Organisation (Australia) DSVD Digital Simultaneous Voice and Data DSW Russian CW brevity code: "Daswedanya" (Goodbye) DT (1)District T (USCG) DTAC Division tactical command post DTE Data Terminal Equipment (computers, workstations, dumb terminals) DTG Date time group (typically ddhhmm mon yy tz) DTM Data Text Message DTMF Dual Tone Multi Frequency (like telco "touch tone") DTMF-RA Dual Tone Multi-Frequency - Remote Access DTO Division tactical operations center DTR Data Terminal Ready (Serial I/O primary handshaking line) DTS Data Terminal Set DU widespread dust DUP-ARQ Hungarian diplomatic teleprinting system DUPE CW prosign: message or contact is a duplicate DUT1 UTC correction interval to get UT1 DV Distinguished Visitor DVA Department of Veterans Administration DVD Digital Versatile Disk DVFR Defense Visual Flight Rules DVI Digital Video Interface DVM Digital Voltmeter DVMT Dynamic Video Memory Technology DVP (1)Distinguished Visitor Protocol (US Air Force DVP (2)Digital Voice Protection (Motorola DES mode) DW Deutsche Welle DX (1)Distant Transmitter.

The distance can be either geographic or psychological.

DX (2)First transmission of FEC character DX (3)Duplex DXAC DX Advisory Committee (ARRL) DXCC Coveted amateur radio award, for confirming at least 100 countries DXing The hobby of listening to distant radio or television DZ (1)Drop zone DZ (2)drizzle E (1)Electromotive force (in volts) E (2)east, ended E-HA Enroute High Altitude E-LA Enroute Low Altitude E-mail Electronic mail, usually by computer EA (1)East Asia (MWARA) EA (2)Electronic Attack EAC Echelons above corps EAD Echelons above division EAF Expeditionary Airfields EAM Emergency Action Message EARN European Academic and Research Network EAS (1)Emergency Alerting System, replaced EBS EAS (2)Equivalent Air Speed EAS (3)Electronic Article Surveillance EBB Electronic bulletin board EBC Emulated buffer computer EBCDIC Extended Binary Coded Decimal Interchange Code, old IBM EBIOS Enhanced Basic Input/Output System (PCs with disks over 540 meg) EBONE A pan-European Backbone service EBS Emergency Broadcasting System, replaced CONELRAD EBU European Broadcasting Union ECB Echelons corps and below ECC (1)Error Correction Code (better than parity) ECC (3)Error Control Coding ECC (2)Error Checking & Correcting (memory chip) ECCM Electronic counter-countermeasures (usually freq hopping) ECHS Extended Cylinder, Head, Sector (addressing) ECM Electronic countermeasures ECOM Emergency Communications ed Edit; any of several funky line editors for old printing TTYs connected to computers EDC Error Detection Code EDD Electronic Document Delivery EDFMCM Environmental Data Fusion for Mine Countermeasures EDI Electronic Document Interchange EDO Extended Data Output (memory chip) EDP Electronic Data Processing EDPT Enhanced (fixed) Disk Parameter Table EDR Enhanced Data Rate EDT Eastern (US) Daylight Time edu Educational Institution domain (Internet) EE (1) Transmission is in English EE (2) Person with Electrical Engineering degree EEC European Economic Community EECEN Electronics Engineering Center, NJ (USCG) EEFI Essential elements of friendly information EEI Essential Elements of Information (Federal report form) EEJ Equatorial Electrojet, might cause trans-eq spread-f propagation EEPROM Electronically Erasable Programmable Read Only Memory EEZ Exclusive Economic Zone ("200-mile limit") EFF Electronic Frontier Foundation, Internet free speech group EFFI Essential Elements of Friendly Information EFTO Encrypted for transmission only EGC Enhanced Group Call (GMDSS) EGP Exterior Gateway Protocols EGS European Geophysical Society EI-232 Latest name for RS-232, the serial interface standard EIA (1)Electronic Industries Association, replaced RETMA EIA (2)Equatorial Ionization Anomaly EIDE Enhanced Integrated Drive Electronics, ATA version once proprietary to WD EIRP Equivalent Isotropically Radiated Power EISA Extended Industry Standard Architecture EISCAT European Incoherent Scatter Radar (research) ELF (1) Extremely Low Frequency (30-300 Hz) ELF (2) US military comm system using same ("Project Elf") ELINT Electronic Intelligence elm ELectronic Mailer, Unix ELSEC Electronic Security ELT Emergency Locator Transmitter EM (1)Electromagnetic EM (2)Extended mission EM (3)Emergency management EM End of Medium (ASCII) Emacs Editing Macros, powerful if ungainly Unix text editor EMC Electromagnetic compatibility EMCON (1)Electromagnetic Radiation Control EMCON (2)Emission Control (radio, etc, not smog) EMF Electromotive force (back-EMF occurs in coils & motors) EMI Electromagnetic incompatibility EMP Electromagnetic pulse EMS (1)Extended Memory Specification (IBM PC, old LIM spec) EMS (2)Emergency Medical Services EMT Emergency Medical Technician, public safety certificate ENE East-northeast engr engineer ENIAC Electronic Numerical Integrator And Computer, 1940s vacuum tube calculating machine ENIGMA (1) European Numbers Information Gathering & Monitoring Assn ENIGMA (2)[~]Historic German crypto machine, WW II code broken by Allies ENJEP Euro-Nato Jet Pilot Training (at Sheppard AFB) ENQ (1)Enquiry, sent by computer to get ACK/NAK response (ASCII 05) ENQ (2)Enquiry (Like Who Are You? (US Army) GA (1)CW prosign: go ahead GA (2)CW brevity code: Good Afternoon Ga As Gallium Arsenide Ga As FET Gallium Arsenide Field Effect Transistor GAFRAN Stationary German Air Force GAK Government Access to Key Ga N Gallium Nitride Gantsec Greater Antilles Section (US military/federal, out of Puerto Rico) GAO General Accounting Office (US Government) GATM Global Air Traffic Management GATR ground-to-air transmitter/receiver GBDL Ground Based Data Link GBS Ground Based Sensor GCA Ground Controlled Approach GCBS Ground Control Bombing System GCCS Two different systems: GCCS (1)Global Command Control System, obsolete US Air Force GCCS (2)Global Command & Control System, 1992 data network plan to replace WWMCCS computers GCHQ Government Communication Headquarters ("G;" UK comint) GCMP Guam Composite Broadcast (obsolete USCG) GCN (1)ground communications network GCN (2)ground control network GD CW brevity: Good GDOC Geographical Display Operations Computer GE (1)General Electric GENSER general service GENTEL General Telephone Company GEO Geosynchronous Earth Orbit GEODSS Ground-based electro-optical deep space surveillance GEOS (1)Geodynamic experimental ocean satellite GEOS (2)Geomagnetic earth observation system GEOS (3)Graphic Environment Operating System GEP Ground Entry Point GETS Government Emergency Telecommunications Service (US NCS) GFAE Government-furnished aerospace equipment GFE (1)Government-furnished equipment GFE (2)God-Furnished Equipment (ionosphere) GFI (1)Government-furnished information GFI (2)Ground Fault Interrupter GFM Government-furnished material GFP Government-furnished part GFP Government-furnished property GG Transmission is in German GHFS Global High Frequency System (US Air Force) GHz Giga Hertz GI (1)Government Issue GI (2)Old slang, from above: U. soldier GID Group Identification GIF Graphics Interchange Format, first used on Compu Serve GIGO Garbage In, Garbage Out; first rule of computing GIS Geographical Information System GLONASS Global Navigation Satellite System (Russian GPS) GM (1)CW brevity code: Good Morning GM (2)General Motors GM (3)General Manager GMDSS Global Maritime Distress & Safety System GMF Ground mobile forces GMRS Gneral Mobile Radio System GMS Geostationary Meteorological Satellite (Japanese) GMT Greenwich Mean Time (obsolete, kept only by BBC) GNA Gulf News Agency GNC (1)guidance and navigation computer GNC (2)guidance, navigation and control gnd ground GNDCON Ground Control gnu Gnu is Not Unix, freeware op-system GO General Officer GOA Gone on Arrival (police) GOES Geosynchronous Oceanic & Environmental Satellite GOGO government-owned, government-operated GOJ Government of Japan GORIZONT Moscow State University Geostationary Monitor satellite GOSIP Government Open Systems Interconnection Profile (UK & US) gov Government site (Internet) GOWON Gulf Offshore Weather Observing.