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The Radio Spectrum
ULF - Ultra Low Frequency (3-30 Hz)
ELF - Extremely Low Frequency (30-300 Hz)
VF - Voice Frequencies (300 Hz-3 kHz)
VLF - Very Low Frequency (3-30 kHz)
LF - Low Frequency (30-300 kHz)
MF - Medium Frequency (300 kHz-3 MHz)
HF - High Frequency (3-30 MHz)
VHF - Very High Frequency (30-300 MHz)
UHF - Ultra High Frequency (300 MHz-3 GHz)
SHF - Super High Frequency (3-30 GHz)
EHF - Extremely High Frequency (30 GHz and above)
// - Indicates a Parallel Frequency
uF - Microfarad
uH - MicroHenry
us - microsecond
uV - Microvolt
10-11-11 MFSK - See Crowd-36
73 - Best Regards
A - Saturday
AB - Air Base
ABC - Australian Broadcasting Corporation/American Broadcasting Company
ABU - Asia Broadcast Union
AC - Alternating Current/Adult Contemporary (light rock) music
ACA - Australian Communications Authority (Australia's FCC)
ACARS - Aircraft Communication and Reporting System
ACE - Association of Clandestine Enthusiasts
ACM - Air Combat Maneuvering
A/D - Analog-to-digital
ADC - Analog-to-Digital Converter
Admin - Administration
Aero - Aeronautical
Af - Africa
AFB - Air Force Base
AFC - Automatic Frequency Control
AFN - American Forces Network
AFRTS - Armed Forces Radio and Television Service
AFTN - Aeronautical Fixed Telecommunications Network
AIR - All India Radio
AKM - Apogee Kick Motor
ALE - Automatic Link Establishment
Am - The Americas
AM - Amplitude Modulation
AMASS - Airport Movement Area Safety System
Amb - Ambulance
Amps - Amperes
AMPS - Advanced Mobile Phone Service (800 MHz)
AMRAD - Amateur Radio Research Development Corporation
AMSAT - Radio Amateur Satellite Corporation
AMTOR - Amateur Teleprinting Over Radio
AMVER - Automated Mutual-assistance Vessel Rescue System
AMW - Air Mobility Wing
ANG - Air National Guard
AOC - Air Operational Control
AP - Associated Press
APRS - Automatic Packet Reporting System
APT - Automatic Picture Transmission (weather satellites)
AR - Air Refueling
ARCP - Air Refueling Control Point
ARES - Amateur Radio Emergency Service
ARG - Air Refueling Group
ARINC - Aeronautical Radio, Inc
ARIP - Air Refueling Initial Point
ARQ - Synchronous transmission and automatic repetition teleprinter system
ARQ6-90 - Six-character blocks simplex ARQ teleprinter system
ARQ-E3 - Single channel ARQ teleprinter system
ARRL - American Radio Relay League
ARS - Amateur Radio Service/Adventure Radio Society
ARTCC - Air Route Traffic Control Center (FAA)
ARW - Air Refueling Wing
As - Asia
ASCII - American Standard Code for Information Interchange
ASDE-3 - Airport Surface Detection Radar System
ASDL - Asymmetrical Digital Subcriber Line
ASECNA - Agence pour la Securite de la Navigation Aerienne en Afrique et a Madagascar
ASP - Application Service Provider
ASOS - Automated Surface Observation System
ASR - Airport Suveillance Radar
Assoc - Association
AT&T - American Telephone and Telegraph
ATA - Airport Traffic Area
ATC - Air Traffic Control
ATIS - Automatic Terminal Information Service
ATS - Applications Technology Satellites
ATTRIB - Attribute
ATU - Arab Telecommunications Union
ATU-A - Arabic ATU-80 alphabet
Au - Australia
Autodin - Automatic Digital Network
AVHRR - Advanced Very High Resolution Radiometer (weather satellites)
AVHRR/2 - Advanced Very High Resolution Radiometer/2 [5 channels] (weather satellites)
AVHRR/3- Advanced Very High Resolution Radiometer/3 [6 channels] (weather satellites)
AWACS - AirborneWarning and Control System
AWOS - Automated Weather Observation Station
AWR - Adventist World Radio
Bandscan - A list of stations normally received at a given location (not DX)
Barefoot - Unamplified
BBC - British Broadcasting Corporation
BBCM - British Broadcasting Corporation Monitoring Service
BBC-WS - British Broadcasting Corporation - World Service
BBG - Broadcasting Board of Governors
BBS - Bulletin Board System
BCB - Broadcast Band (Refers to the 530-1705 kHz AM band)
BCNU - Be Seeing You
Bcst - Broadcast
Bd - Baud
BFO - Beat Frequency Oscillator
BIOS - Basic Input/Output System
Bldg - Building
BLM - Bureau of Land Management
BNC - Coax connector commonly used with VHF/UHF equipment
BSKSA - Broadcasting Service of the Kingdom of Saudi Arabia
BUD - Big Ugly Dish (C-band TVRO setup)
CAMSLANT - Communications Area Master Station, Atlantic
CAMSPAC - Communications Area Master Station, Pacific
CAP - Civil Air Patrol
CAP - Combat Air Patrol
Caracol - Primera Cadena Radial Colombiana
Carib - Caribbean
CARMA - Chicago Area Radio Monitors Association
CB - Citizen Band
C-band - The spectrum from 3.7-4.2 GHz where satellite TV and other fixed satellite services are broadcast.
CBC - Canadian Broadcasting Corporation
CBS - Columbia Broadcasting Company
CCD - Charge coupled device
CD - Compact Disc
CDMA - Coded Division Multiple Access
CD-ROM - Compact Disc Read Only Memory
CE - Chief Engineer
CES - Consumer Electronics Show
CG - Coast Guard
CIA - Central Intelligence Agency
CIB - Compliance and Information Bureau (FCC)
CID - Call-letter identification with Morse code/Criminal Investigation Division
CIS-36 - See CROWD-36
CI-V - Radio computer interface made by Icom
CJCS - Chairman, Joints Chief of Staff
CL - Call Letters
CLA - Cuban Coastal Radio Station
CMA - China Meteorological Administration
CMOS - Complementary Metal-Oxide Semiconductor
C/N - Carrier-to-Noise Ratio
CNN - Cable Network News
CO - Commanding Officer
Co. - County
COM 1 - First Serial Port (Asynchronous Port)
COM 2 - Second Serial Port
COM 3 - Third Serial Port
COM 4 - Fourth Serial Port
Comm - Communications
COMSAT - Communications Satellite, Inc.
COMSUBGROUP - Commander, Submarine Group
CONUS - Continental United States
COQ-8 - Eight-tone multi-frequency shift keyed teleprinter system (Coquelet)
Coquelet-8 - See COQ-8
CP - Command Post
CPC - Courtesy Program Committee (a group that arranges DX Tests)
CPU - Central Processing Unit
CQ - General call to all stations
CR - Croatia Radio
CRI - China Radio International
CROWD-36 - A multi-frequency shift keyed communications system. (Also known as URS Multitone, CIS-36, 10-11-11 MFSK)
CRTC - Canadian Radio-Television Commission (The Canadian FCC)
CRW - Clandestine Radio Watch
CSQ - Carrier Squelch
CTCSS - Continuous Tone Controlled Squelch System
CW - Continuous Wave (Morse code)
C&W - Country and Western music
CX - Conditions
DAB - Digital Audio Broadcast
dB - Decibel
dBi- Decibels over isotropic
DBS - Direct Broadcast Satellite
DC - Direct Current
DCII - DigiCipher II
DCS - Digital Coded Squelch
de - Morse code prosign meaning "from"
DEA - Drug Enforcement Administration
Dead Air - Station is on the air but broadcasting silence (no programming)
Dept. - Department
DGPS - Differential Global Positioning System
DJ - Disc Jockey
DMA - Direct Memory Access
DME - Distance Measuring Equipment
DMSP - Defense Meteorological Satellite Program
DMX - Digital Music Express
Do - Domestic
DOAS - Department of Administrative Services
DoD - Department of Defense
DOS - Disk Operating System
DPL - Digital Private Line
DPS - Department of Public Safety
DSC - Digital Selective Calling
DSL - Digital Subscriber Line
DSN - Defense Switching Network
DSP - Digital Signal Processing
DSR - Digital Satellite Radio
DSS - Digital Satellite System
DSWCI - Danish Shortwave Clubs International
DTB - Digital Television Broadcasting
DTH - Direct to Home
DTMF - Dual Tone Multi Frequency
DTRS - Digital Trunk Radio System
DTV - Digital Television
DUP-ARQ - Hungarian diplomatic simplex ARQ teleprinter system
DVB - Digital Video Broadcast
DW - Deutsche Welle
DX - Distant Station Reception
DXCC - ARRL DX Century Club for working at least 100 countries
DXer - A person who engages in the hobby of distant radio/television reception
DXing - The hobby of listening to distant radio or television signals
DXpeditions - DX Expeditions (trips to the boonies by radio listeners)
DX Test - A special program put on by a radio station to make it easier for DX enthusiasts to hear that station
E - Voltage (measured in volts)
EAM - Emergency Action Message (U.S. military forces)
ECFS - Electronic Comment Filing System
ECM - Electronic Countermeasures
ECPA - Electronic Communications Privacy Act
ECS - Emergency Communications System
ECSS - Exalted Carrier Selectable Sideband
EDACS - Enhanced Digistal Access Communications System
EE - English language
EEPROM - Electrically Erasable Programmable Read-Only Memory
EIRP - Effective Isotropic Radiated Power
ELT - Emergency Locator Transmitter
EMA - Emergency Management Agency
EME - Earth-Moon-Earth
Emerg. - Emergency
EMS - Emergency Medical Service
ENIGMA - European Numbers Information Gathering and Monitoring Association whose shorthand codes became the standard to identify "numbers" transmissions
EOD - Explosive Ordnance Disposal
EPIRB - Emergency Positioning Indicating Radio Beacon
EQT - Equatorial
ER - Emergency Room
ERP - Effective Radiated Power
ERT - Elliniki Radiophonia Teleorassi (Greece)
ESA - European Space Agency
E-skip - Sporadic E-layer ionospheric propagation
ET - Eastern Time
E-Trax - A DOS based utility which allows tracking of the Ericsson EDACS trunking systems.
Eu - Europe
EW - Electronic Warfare
EZL - Easy listening music
FAA - Federal Aviation Administration
FAC - Forward Air Controller
FAPSI - Federal Agency for Communications and Intelligence (Russian Agency)
FAQ - Frequently Asked Questions
FAX - Facsimile
FBI - Federal Bureau of Investigation
FBO - Fixed Base Operator
FCC - Federal Communications Commission
FD - Fire Department
f/D Ratio - Focal Length-to-Diameter Ratio
FE - Far East
FEBA - Far East Broadcasting Association
FEBC - Far East Broadcast Company
FEC - Forward error correction teleprinter system
FEC-A - One-way traffic FEC teleprinter system
FEMA - Federal Emergency Management Agency
Feng Yung - Chinese series of geostationary weather imaging satellites
FF - French language
FFH - Fast Frigate Helicopter
FGS - Federal German Ship
FHWA - Federal Highway Administration
Fig. - Figure
FM - Frequency Modulation
FM2 - FM Squared
Freq - Frequency
FRS - Family Radio Service
FRW - Free Radio Weekly
FSS - Flight Service Station (FAA)
Ft. - Fort
FTA - Free-to-Air
FTP - File Transfer Protocol
FTW - Flying Training Wing
FUNC - Function
FW - Fighter Wing
FY - Fiscal Year
GANTSEC - Greater Antilles Section (US Coast Guard)
GB - GigaByte
GHFS - Global High Frequency System (U.S. Air Force)
GHz - Gigahertz
GI - General Instrument
GID - Group Identifications
GMDSS - Global Maritime Distress and Safety System
GMRS - General Mobile Radio Service
GMS - Geostationary Meteorological Satellite, Japanese geostationary weather imaging satellite
GMT - Greenwich Mean Time (has been replaced in most applications by UTC)
GOES - Geostationary Operational Environmental Satellites, US geostationary weather imaging satellite constellation
GOMS - Geostationary Operational Meteorological Satellite, Russian geostationary weather imaging satellite
Golay - Golay Sequential Pager Signaling System
Goniometer - Direction finder
GOS - Gospel music
GPO - General Post Office
GPS - Global Positioning Satellites
Graveyard Stations - AM radio stations on 1230, 1240, 1340, 1400, 1450, 1490 kHz
GSM - Global System for Mobiles (900 MHz)
GTO - Geostationary Transfer Orbit
G/T Ratio - Gain-to-(noise) Temperature Ratio
GVAR - GOES Variable Format (Weather Satellites)
GWEN - Ground Wave Emergency Network (USAF project, no longer operational)
ha. - Hectares
HAARP - High Frequency Active Auroral Research Program
HAR - Highway Advisory Radio (see TIS)
HBO - Home Box Office
HCDX - Hard Core DX
HD - High Density
HDTP - Handheld device transfer/transport protocol
HDTV - High Definition Television
HEMT - High Electron Mobility Transistor
HF - High Frequency (3-30 MHz)
HFDL - High Frequency Data Link
HHS - Health and Human Services
HM - Her Majesty
HMCS - Her Majesty Canadian Ship
hp - Horsepower
HQ - Headquarters
HRIT - High Rate Information Transmission (satellite)
HRPT - High Resolution Picture Transmission (weather satellite)
hrs - Hours
HS - High School
HT - Handi Talkie/Handheld Transceiver
HTML - HyperText Markup Language
HTTP - HyperText Transfer Protocol
HWD - Height, Width and Depth
Hydrolant - U.S. broadcasts of Atlantic and Mediterranean Ocean navigational warnings
Hydropac - U.S. broadcasts of Pacific and Indian Ocean navigational warnings
Hz - Hertz
I - Current (measured in amperes)
IARU - International Amateur Radio Union
IBB - International Broadcasting Bureau
IBC - International Broadcasting Corporation
IBM - International Business Machines
IBOC - Inband Onchannel
IC - Integrated Circuit
ICS - Internet Connection Sharing
ID - Identification
IEEE - Institute of Electrical and Electronics Engineering
IF - Intermediate Frequency
IFF - Identification Friend or Foe
IFR - Instrument Flight Rules
ILS - Instrument Landing System
Info - Information
Inmarsat - International Maritime Satellite Organization
INSAT - Indian National Satellite, a geostationary satellite launched by India that provides communication and weather imaging.
INTERPOL - Organisation Internationale de la Police Criminelle
Intl/Int'l - International
I/O - Input/Output
IPX - Internetwork Packet Exchange
IRC - International Reply Coupon
IRCA - International Radio Club of America
IRQ - Computer Interrupt Request
ISA - Industry Standard Architecture
ISB - Independent Sideband
ISDN - Integrated Services Digital Network
ISP - Internet Service Provider
ITA - International Telegraph Alphabet
ITU - International Telecommunications Union
JIATF-E - Joint Inter-Agency Task Force-East
JIATF-S - Joint Inter-Agency Task Force-South
JStars - Joint Surveillance Target Attack Radar System
KBC - Kenya Broadcast Corporation
kbps - Kilobytes per second
KBS - Korean Broadcasting System
kHz - Kilohertz
km - Kilometer
Knot - A nautical mile per hour, one mile is 1.15 statue miles or 1.85 kilometers
Ku-band - The spectrum from 11.7-12.2 GHz were satellite TV and other fixed satellite services are broadcast. Also in North America the spectrum from 12.2-12.7 GHz were the small dish (18-inches) antenna systems operate.
kW - Kilowatt
LAN - Local Area Network
LAPD - Los Angeles Police Department
lbs. - Pounds
LCD - Liquid Crystal Display
LDOC - Lond Distance Operational Control
LED - Light Emitting Diode
LF - Low Frequency
LNA - Low Noise Amplifier
LNB - Low Noise Block Downconverter
LNBF - Low Noise Block Downconverter Feedhorns
LNBS - Lesotho National Broadcasting Service
LORAN - Long Range Navigational System
LOWFER - Low Frequency Experimental Radio
LP10 - Proposed catagory of low power FM station with power at 10 watts
LP100 - Proposed catagory of low power FM station with power at 100 watts
LP1000 - Proposed catagory of low power FM station with power at 1000 watts
LPF - Low Pass Filter
LPFM - Low Power FM (United States)
LPON - Low Power Open Narrowcasting (Australia)
LRIT
- Low Rate Information Transmission (satellite)
LSB - Lower Sideband
LSR - Local Sunrise
LSS - Local Sunset
LW - Longwave (150-300 kHz)
LWCA - Longwave Club of America
M - Monday/meter
mA - Milliampere
mA/h - Milliampere-hours
MAC - Multiplexed Analog Components
MAG - Marine Air Group
MARCS - Multi-Agency Radio Communications System (Ohio)
MARS - Military Affiliate Radio System
MAW - Marine Air Wing
mb/MB - meter band/MegaByte
Mbps - MegaBytes Per Second
MBTA - Massachusetts Bay Tranportaion Authority
MCAS - Marine Corps Air Station
MDR - Mitteldeutscher Rundfunk (Germany)
MDT - Mobile Data Terminal
Me - Middle East
Med - Medical
METAR- Meterological Aviation Routine report
Meteo/Metro - Meteorological
Meteor - Russian series of polar orbiting weather imaging satellites
Meteosat - European geostationary weather satellite constellation
MF - Medium Frequency
MFA - Ministry of Foreign Affairs
MFSK - Multi Frequency Shift Keyed
Mgt - Management
MHz - MegaHertz
MI6 - Military Intelligence, group 6 (U.K. spy agency)
Minrex - Ministry of Foreign Affairs Cuba
MINURCA - Mission des Nations Unies en Republique Centrafricaine
mm/MM - Millimeter/Mass Media
MNO - Merlin Network One
MOA - Military Operating Area
Mode C - IFF mode used by civilian aircraft
MPEGII - Digital video compression technique
ms - milliseconds
MS-DOS - Microsoft Disk Operating System
MSK - Minimum Shift Keying
MSL - Mean Sea Level
MT - Monitoring Times
MTR - Military Training Route
MUF - Maximum Useable Frequency
MV - Motor Vessel
mW - Milliwatt
MW - Medium Frequency (0.3-3 MHz)
MW - Medium Wave (typically 530-1710 kHz)
MW - MegaWatts
NAB - National Association of Broadcasters
NAf - North Africa
Na - North America
NAM - Narrowband Amplitude Modulation
NAMPS - Narrowband Advanced Mobile Phone Service (800 MHz)
NAS - Naval Air Station
NASA - National Aeronautics and Space Administration
NASWA - North American Short Wave Association
NAT - Network Address Translation
Natl - National
NATO - North Atlantic Treaty Organization
NAVAREA - Navigational Area (defined by IMO & IHO)
Navrad - Naval Radio
NAVTEX - Navigational Text (broadcast on 518 kHz)
NBC - Nambian Broadcasting Corporation
NBC - National Broadcasting Corporation
NCC - National Coordination Center
NCS - National Communications System
NCS - Net Control Station
NDB - Non-Directional Beacon
NE - Northeast
NECN - National Emergency Coordination Network
NESDIS - National Environmental Satellite, Data and Information Service
NESS - National Earth Satellite Service
NetBEUI - NetBIOS Extended User Interface
NetBIOS - Network Basic Input/Output System
Nexrad - Next Generation Doppler Radar
NFM - Narrowband Frequency Modulation
NFM - Narrowband Frequency Modulation
NHK - Nippon Hoso Kyokai
NIC - Network Interface Card
NiCd - Nickel Cadmium Battery
NiMH - Nickel Metal Hydride battery
NIRC - National Interagency Fire Center
NIRSC - National Incident Radio Support Cache
nm - Nautical mile
NOAA - National Oceanographic and Atmospheric Administration
No Joy - Station did not answer call
NORAD - North American Oceanographic and Atmospheric Administration
NOS - Nostalgic music (mostly 1940s-1950s)
NPR - National Public Radio
NPRM - Notice of Proposed Rulemaking
NRC - National Radio Club
NRCS - Natural Resources Conservation Service
NRK - Norsk Rikskringkasting
NSAm - North South America
NSMC - Chinese National Satellite Meteorological Center
NSW - New South Wales
NTIA - National Telecommunications and Information Administration
NTSC - US and Japanese TV broadcasting standard utilizing 525 scanning lines
NU - Numero Uno
NVIS - Near Vertical Incidence Skywave
NWR - National Wildlife Refuge
NWR-SAME - National Weather Radio Specific Area Message Encoding
NWS - National Weather Service/News
Nx - News
OC - Open Carrier (see Dead Air)
OCF - Off-Center Fed
OEDP - Operational Error Detection Patch
Okean - Russian low earth orbit earth resources imaging satellite series
OLD - Oldies rock music
Om - Omnidirectional
Op-amp - Operational Amplifier
Ops - Operations
ORTB - Office de Radiodiffusion et Television du Benin
OTHR - Over The Horizon Radar
Pa - Pacific
Packet - Amateur radio error correcting mode
PACTOR - Teleprinter system that combines certain aspects of Packet and SITOR.
PAL - European TV broadcasting standard utilizing 625 scanning lines
PAL - Precision Approach and Landing system or radar
PBS - Public Broadcasting System
PC - Personal Computer/Printed Circuit
PCFM - Personal Computer Frequency Manager
PCI - Peripheral Component Interconnect/Interface
PCS - Personal Communication System/Satellite
PD - Police Department/Primary Data
PDA - Personal Data Assistant
PDUS - Primary Data User Station
PETRA - Jordan News Agency
PFC - Prepared Form Card
PIP - Picture in Picture
PL - Private Line
PLL - Phase Locked Loop
PNG - Papua New Guinea
POCSAG - Digital Pager Code
POL-ARQ - Polish diplomatic ARQ teleprinter system
POW - Prisoner of War
PPI - Plan Position Indicator
PROM - Programmable Read-Only Memory
PS/2 - Programming System 2
PSA - Public Service Announcement
PSAP - Public Safety Answering Points
PSK - Phase Shift Keying
PSRA - Pre-sunrise authorization
PSSA - Post-sunset authorization
PSTN - Public Switched Telephone Network
PTT - Post, Telegraph and Telephone Administration
PTT - Push to Talk
Q - Performance rating regarding selectivity or bandwidth, with highest Q being sharpest or most narrow
QBS - Qatar Broadcasting Service
QFH - Quadrifillar Helix Antenna
QRA - The name of my station is ...
QRM - Interference from another station
QRN - Interference from natural sources (i.e. lightning, etc) or from man-made sources other than radio stations (ignition noise, vacuum cleaners, etc)
QRP - Low power operation
QSL - A card or letter confirming reception of a radio station
QSO - Communications between two or more stations
QTH - Location
R - Resistance (measured in ohms)
R. - Radio
R3E - Upper sideband reduced carrier
RACES - Radio Amateur Civil Emergency Service
RAE - Radiodifusion Argentina Al Exterior (Argentina)
RAF - Royal Air Force
RAI - Radiotelevisione Italiana
RAM - Random Access Memory
RCI - Radio Canada International
RCMP - Royal Canadian Mounted Police
RCS - Radio Communication System
RCV - Radio Christian Voice
Rcvr - Receiver
RDA - Radio Democracy for Africa
RDF - Radio Direction Finding
RDP - Radiodifusao Portuguesa EP
REACT - Radio Emergency Associated Communications Teams
REE - Radio Exterior de Espana
Rel - Religious
Rep - Republic
Resurs - Russian earth resources imaging satellite series
RF - Radio Frequency
RFA - Radio Free Asia
RFE - Radio Free Europe
RFI - Radio France International
RFPI - Radio For Peace International
RG-6 - Low loss 75 ohm coax (highly recommended by Grove Ent for scanner/shortwave antenna installations)
RHC - Radio Havana Cuba
RKI - Radio Korea International
RL - Radio Liberty
RMI - Radio Moldovia International
RMS - Royal Majesty Ship
RN - Royal Navy
RN - Radio Netherland
RNI - Radio Norway International
RNZI - Radio New Zealand International
ROM - Read Only Memory
rpm - Rotations per minute
Rptr - Repeater
RRI - Radio Republik Indonesia
RS - Radio Shack
RSA - Republic of South Africa
RS-ARQ - (WUN term) Automatic link set-up simplex ARQ teleprinter system by Rohde and Schwarz. Klingenfuss calls this ALIS. Also known as Merlin.
RTBF - Radio-Television Belge de la Communiaute Francaise
RTE - Radio Telefis Eireann (Ireland)
RTG - Radiodiffusion Television Guineenne
RTI - Radio Taipei International
RTTY - Radioteletype
RTV - Radiodiffusion Television
RTVM - Radiodiffusion Television Malienne (Office of, ORTM)
RVI - Radio Vlaanderen International
RVW - Review
Rx - Receiver
Sa - South America
SA - Scientific Atlanta
SAM - Special Air Mission (U.S. Military VIP flight)/ Surface to Air Missile
SASE - Self Addressed Stamped Envelope
S-band - Microwave frequencies above UHF
SCA - Subsidiary Carrier Authorization (now known as SCS)
SCOPE - System Capable of Planned Expansion (U.S. Air Force)
SCPC - Single Channel Per Carrier
SCS - Subsidiary Carrier Service
SCSI - Small Computer Systems Interface
Sec. - Second
SECAM - French TV broadcasting standard, also used by some (former) communist countries
SECURE - State Emergency Capability Using Radio Effectively
SELCAL - Selective Calling
SELSCAN - Selective Scanning
Sesqui - A sesquipedalian word used by Glenn Hauser, commonly known as a Hauserism
Sesquihour - One and a half hours
Sesquiminute - One and a half minutes
SETI - Search for Extraterrestrial Intelligence
SHARES - Shared Resources (U.S. government traffic network)
S.I.B.C. - Solomon Islands Broadcasting Corporation
Sich - Russian earth resources imaging satellite series
SID - Sudden Ionospheric Distrubance/Singing Identification
Silent - Station off the air
SIM - Subscriber Identity Module
SINAD - Signal to noise and distortion ratio
SINPO - A code system used by radio hobbyists to indicate how well a station was received: S=Strength, I=Interference, N=Noise, P=Propagation, O=Overall
SIO - A code system used by radio hobbyists to indicate how well a station was received: S=Strength, I=Interference, O=Overall
SIS - Secret Intelligence Service (United Kingdom)
SITA - Société Internationale de Télécommunications Aéronautiques
SITOR-A - Simplex teleprinting over radio system, mode A
SITOR-B - Simplex teleprinting over radio system, mode B (FEC mode)
SLBC - Sri Lanka Broadcasting Corporation
SLR - Side Looking Radar
S-Meter - Signal Strength Meter
SMIS - Russian Space Monitoring Information Support
SMR - Specialized Mobile Radio
SMS - Synchronous Meteorological Satellite
S/N - Serial Number
S/N Ratio - Signal-to-Noise Ratio
SNG - Satellite News Gathering Unit
SNOTEL - Snowpack Telemetry
SO - Sheriff Office
SPST - Single Pole Single Throw (switch)
SPT - Sports
SPX - Sequenced Packet Exchange
SQL - Squelch
SRS - Sunrise Skip
SS - Spanish language
SSAm - South South America
SSB - Single Sideband/ U.S. National Anthem: Star Spangled Banner
SSN - Sunspot Number
SSR - Secondary Surveillance Radar
SSS - Sunset Skip
SSTV - Slow Scan Television
STRATCOM - U.S. Strategic Command
STS - Space Transportation System (Space Shuttle)
SVGA - Super Video Graphics Adapter
S-VISSR - Stretched Very High Resolution Infrared Spin Scan Radiometer
SW - Shortwave (high frequency - HF)
SWBC - Shortwave Broadcast
SWED-ARQ - Swedish diplomatic ARQ teleprinter system
SWL - Shortwave Listener
SWNet - Shortwave Net
SWR - Standing Wave Ratio
SWRL - Shortwave Reception Log (DXtreme Software Product)
Tac - Tactical
TACAN - Tactical Air Navigation
TACTS - Tactical Aircrew Combat Training System
TC - Time Check
TCP/IP - Transmission Control Protocol/Internet Protocol
TDF - Telediffusion de France
TDMA - Time Division Multiple Access
TECG - Tactical Exercise Control Group (US Marine Corps)
Tent - Tentative
TI - Terrestrial Interference
TIAWR - Costa Rica Adventists World Radio
TIP - Tiros Information Processor (satellite data mode)
TIS - Traveler Information Service
TL - Tower Location
TLA - Three Letter Acronym
TLK - Talk
TOSS - Television Ordnance Scoring System
TP - Test Point
TRACON - Terminal Radar Approach Control
Tropical Shortwave Bands - 2300-2495 kHz, 3200-3400 kHz, and 4750-5060 kHz
TRS - trunked radio system
TRT - Turkiye Radyo-Televizyon Kurumu
TV - Television
TVRO - TV Receive Only
TVI - Television Interference
TW - Test Wing
TWEB - Transcribed Aviation Weather Broadcast
TWC - Two-way communications
Twinplex - Four-frequency duplex teleprinter system also known as F7B4 Twinplex SITOR-A
TWR - Trans World Radio
Tx - Transmit
Txt - Text
UART - Universal Asynchronous Receiver/Transmitter
UC - Urban Contemporary
UFE - User Defined Field
U.S. - United States
UHF - Ultra High Frequency
U.K. - United Kingdom
UKoGBaNI - United Kingdom of Great Britain and Northern Ireland
ULS - Universal License System
UN - United Nations
Unid - Unidentified
UNITA - National Union for the Total Independence of Angola
UPI - United Press International
UPN - United Paramount Network
URL - Universal Resource Locator
URS Multitone - See Crowd-36
U.S. - United States
USA - United States of America
USAF - U.S. Air Force
USB - Upper Sideband
USCG - U.S. Coast Guard
USIA - U.S. Information Agency
USMC - U.S. Marine Corps
USN - U.S. Navy
USS - United States Ship
USSR - Union of Soviet Socialist Republics
UT - Universal Time
UTC - Universal Time Coordinated
UTP - Universal Twisted Pair
UV - Ultraviolet
UWB - Ultra-wideband
V. - Voice
Va - Various
Vac/VAC - Volts Alternating Current
VC - Voz Christiana
VCII - VideoCipher II
VCR - Video Cassette Recorder
Vdc/VDC - Volts Direct Current
VF - Voice Frequencies (3-30 kHz)
VFO - Variable Frequency Oscillator
VFR - Visual Flight Rules
VFT - Voice Frequency Telegraph teleprinter system
VIP - Very Important Person
VHF - Very High Frequency
VHRR - Very High Resolution Radiometer (weather satellites)
VID - Spoken call letter identification
VIP - Very Important Person
VISSR - Very High Resolution Infrared Spin Scan Radiometer (weather satellites)
VK - Amateur callsign prefix for Australia
VLF - Very Low Frequencies (10-100 kHz)
VOA - Voice of America
VOIRI - Voice of the Islamic Republic of Iran
VOLMET - Aviation Weather Broadcasts (on HF)
VON - Voice of Nigeria
VOR - Voice of Russia
VOR - VHF Omnidirectional Range
VOT - Voice of Turkey
VOV - Voice of Vietnam
VOX - Voice Operated Relay
VP - Vice President
VRT - Vlaamse Radio en Televisie
VSWR - Voltage Standing Wave Ratio
VTO - Voltage Tuned Oscillator
VTR - Video Tape Recorder
VTS - Vessel Traffic Service
WAAS - Wide Area Augmentation System (corrects errors in GPS system)
WAM - Wideband Amplitude Modulation
WAP - Wireless application protocol
WARC - World Administrative Radio Conference
WEFAX - Weather Facsimile
WFM - Wideband Frequency Modulation
WG - Wing
WLM - Coastal Buoy Tender (Medium Endurance US Coast Guard cutter)
WMO - World Meteorological Orgranization
wpm - Words Per Minute
WRN - World Radio Network (via satellite)
WRTH - World Radio TV Handbook
WS - World Service
WTB - Wireless Telecommunications Bureau (FCC)
WTI - Weapons Tactical Instructor
WTFDA - Worldwide TV/FM DX Association
WUN - World Utility News (www.wunclub.com)
WWII - World War Two
WWV - National Bureau of Standards Time Station, Ft. Collins, CO
WWVH - National Bureau of Standards Time Station in Hawaii
WWW - World Wide Web
Wx - Weather
WXSAT - Weather Satellite
X-band - Expanded AM broadcast band (1610-1700 kHz)
YLE - Yleisradio Oy (Finnish Non-commercial broadcast service)
ZBC - Zimbabwe Broadcasting Corporation
ZBS - Zambia Broadcasting Corporation
ZL - Amateur callsign prefix for New Zealand
Zulu - Military time zone (same as UTC)