| Abbr. | Meaning |
|---|
| A | Ampere |
| A-FHSS | Adaptive Frequency Hopping Spread Spectrum |
| AC | Alternating Current |
| ACAS | Airborne Collision Avoidance System |
| ACELP | Adaptice Code Excited Linear Prediction |
| ADS-B | Automatic Dependent Surveillance-Broadcast |
| AF | Audio Frequency |
| AFC | Automatic Frequency Control |
| AFSK | Audio Frequency Shift Keying |
| AGC | Automatic Gain Control |
| AIS | Automatic Identification System |
| ALE | Automatic Link Establishment |
| AM | Amplitude Modulation |
| AMC | Automatic Modulation Control |
| AMPS | Advanced Mobile Phone System |
| AMTOR | AMateur Teleprinting Over Radio |
| ANL | Automatic Noise Limiter |
| AOS | Acquisition Of Signal (or Satellite) |
| APRS | Automatic Packet/Position reporting System |
| APT | Automatic Picture Transmission |
| AQS | Amateur Quinmatic System |
| ARES | Amateur Radio Emergency Service |
| ARISS | Amateur Radio on the International Space Station |
| ARQ | Automatic Repeat reQuest |
| ARRL | American Radio Relay League |
| ARS | Automatic Repeater Shift |
| ASAS | Airborne Separation Assurance System |
| ASC | Automatic Squelch Control |
| ASK | Amplitude Shift Keying |
| ASTRID | The police/fire/ambulance TETRA network in Belgium |
| ATC | Air Traffic Controller |
| ATT | Attenuator |
| ATV | Amateur TeleVision |
| AWI | Antenna Warning Indicator |
| BC | BroadCasting |
| BER | Bit Error Rate |
| BGA | Ball Grid Array (A type of surface-mount package for IC's) |
| Bit banging | Hex editing |
| BJT | Bipolar Junction Transistor |
| BMS | Battery Management System |
| BNC | Bayonet Neill Concelman (A type of RF connector) |
| BOSNET | The police/fire/ambulance TETRA network in Germany |
| BPL | Broadband over Power Lines |
| BSM | Blind Spot Monitoring (A vehicle lane change collision warning system) |
| BW | Band width |
| C2000 | The police/fire/ambulance TETRA network in the Netherlands |
| CAS | Carrier Activated Squelch |
| CB | Citizen Band |
| CBRS | Citizen Band Radio Service (Australia) |
| CC | Constant Current |
| CCK | Complementary Code Keying |
| CDMA | Code Division Multiple Access |
| CERDIP | CERamic Dual In-line Package |
| CME | Coronal Mass Ejection |
| CMOS | Complementary Metal-Oxide Semiconductor |
| COF | Chip On Film |
| COFDM | Coded Orthogonal Frequency Division Multiplex |
| COR | Carrier Operated Relay |
| COS | Carrier Operated Switch |
| CPFSK | Continuous Phase Frequency Shift Keying |
| CPM | Continuous Phase Modulation |
| CSS | Chirp Spread Spectrum |
| CTC | Communications Transistor Corporation |
| CTCSS | Continuous Tone Coded Squelch System (Same as PL) |
| CV | Constant Voltage |
| CW | Continuous Wave |
| D-STAR | Digital Smart Technologies for Amateur Radio |
| DAB | Digital Audio Broadcasting |
| DAB+ | Digital Audio Broadcasting Plus (Newer and more efficient compression) |
| DATV | Digital Amateur TeleVision |
| DC | Direct Current |
| DCS | Digital Coded Squelch |
| DECT | Digital Enhanced Cordless Telecommunications |
| DF | Dissipation Factor |
| DF | Direction Finding |
| DIMM | Dual In-line Memory Module |
| DIP | Dual In-line Package |
| DMO | Direct Mode Operation (TETRA) |
| DMR | Digital Mobile Radio |
| DOTAC | Department of Transport and Communications (Australia) |
| DPMR | Digital Personal Mobile Radio |
| DQPSK | Differential Quadrature Phase Shift Keying |
| DRM | Digital Radio Mondiale |
| DRO | Dielectric Resonator Oscillator |
| DSB | Double Side Band |
| DSC | Digital Selective Calling |
| DSS | Digital Spread Spectrum |
| DSSS | Direct Sequence Spread Spectrum |
| DTMF | Dual Tone Multi Frequency (also known as Touch Tone) |
| DUT | Device Under Test |
| DW | Dual Watch |
| ECC | European Communications Committee |
| ECR | Exalted Carrier Reception |
| ECSS | Exalted Carrier Selectable Sideband |
| EHF | Extremely High Frequency (30 - 300 GHz) |
| EMC | ElectroMagnetic Compatibility |
| EME | Earth-Moon-Earth (Moonbounce) |
| EMG | Emergency |
| EMI | ElectroMagnetic Interference |
| EMS | Emergency Medical Service |
| EOM | Ethernet Over Mains |
| EPIRB | Emergency Position Indicating Radio Beacon |
| ERC | European Radiocommunications Committee |
| ESD | ElectroStatic Discharge |
| ESR | Equivalent Series Resistance |
| ETSI | European Telecommunications Standards Institute |
| EUT | Equipment Under Test |
| EWF | Emergency Warning Function |
| F | Farad (Capacitance) |
| FCC | Federal Communications Commission (USA) |
| FEC | Forward Error Correction |
| FET | Field Effect Transistor |
| FHSS | Frequency Hopping Spread Spectrum |
| FIPS | Federal Information Processing Standard |
| FM | Frequency Modulation |
| FM-N | Frequency Modulation Narrow (Same as NFM) |
| FM-W | Frequency Modulation Wide (Same as WFM) |
| FPGA | Field-Programmable Gate Array |
| FRS | Family Radio Service |
| FSK | Frequency Shift Keying |
| FSTV | Fast Scan TeleVision (See also ATV) |
| FUN | Function |
| GFSK | Gaussian Frequency Shift Keying |
| GFW | Global Frequency Warning |
| GHz | GigaHertz (1 GHz = 1000 MHz) |
| GMDSS | Global Marine Distress and Safety System |
| GMRS | General Mobile Radio Service |
| GMSK | Gaussian Minimum Shift Keying |
| GND | Ground |
| GP | Ground Plane |
| GPR | Ground Penetrating Radar |
| GPS | Global Positioning System |
| GSM | Global System for Mobile communication |
| GTO | Geostationary Transfer Orbit |
| H | Henry (Inductance) |
| HALT | Highly AcceLerated Testing |
| HEO | High Earth Orbit |
| HF | High Frequency (3 - 30 MHz) |
| HRPT | High Resolution Picture Transmission |
| HT | Handie Talkie (Portable transceiver) |
| Hz | Hertz |
| I/O | Input/Output |
| IARU | International Amateur Radio Union |
| IC | Integrated Circuit |
| ICS | Intermittent Communication Service |
| ID | Identification |
| IDAS | Icom Digital Advanced System |
| IF | Intermediate Frequency |
| IFSS | Interference Free Signal Strength |
| IFT | Intermediate Frequency Transformer |
| IP | Ingress Protection |
| IP | Intercept Point |
| IRLP | Internet Radio Linking Project |
| ISI | InterSymbol Interference |
| ISM | Industrial, Scientific & Medical |
| ISS | International Space Station |
| ITAR | International Traffic in Arms Regulations |
| ITU | International Telecommunication Union |
| IVT | In-Vehicle Technology |
| JEDEC | Joint Electronics Device Engineering Council |
| JFET | Junction gate Field Effect Transistor |
| JRCC | Joint Rescue Co-ordination Center (Sweden Rescue, maritime and aeronautical) |
| KDR | KortDistansRadio (Swedish, = Short distance radio) |
| KHz | KiloHertz (1 KHz = 1000 Hz) |
| LCR | Last Channel Recall |
| LDMOS | Laterally Diffused Metal Oxide Semiconductor |
| LDO | Low Drop Out |
| LEO | Low Earth Orbit |
| LF | Low Frequency (30 - 300 KHz) |
| LIDAR | Laser Imaging Detection And Ranging |
| LNA | Low Noise Amplifier |
| LNB | Low Noise Block downconverter |
| LOS | Loss Of Signal (or Satellite) |
| LPAM | Low Power AM (Max 1 W in the UK) |
| LPD | Low Power Device |
| LSB | Lower Side Band |
| LUF | Lowest Usable Frequency |
| LVD | Low Voltage Directive |
| LVDS | Low-Voltage Differential Signaling |
| LW | LongWave |
| MCU | MicroController Unit |
| MCW | Modulated Continuous Wave |
| MDS | Minimum Discernable Signal |
| MECO | Main Engine CutOff |
| MELF | Metal Electrode Leadless Face |
| MELP | Mixed-Excitation Linear Predictive |
| MELPe | Mixed-Excitation Linear Predictive enhanced |
| MEPT | Manned Experimental Propagation Transmitter |
| MER | Modulation Error Ratio |
| MF | Medium Frequency (300 - 3000 KHz) |
| MF | Mellanfekvens (Swedish) = Intermediate Frequency |
| MFSK | Multiple Frequency Shift Keying |
| MHz | MegaHertz (1 MHz = 1000 KHz) |
| MIMCO | Marconi International Marine COmpany |
| MMI | Man-Machine Interface |
| MMIC | Monolithic Microwave Integrated Circuit |
| MOSFET | Metal Oxide Semiconductor Field Effect Transistor |
| MPPT | Maximum Power Point Tracker (A type of solar charger) |
| MSK | Minimum Shift Keying |
| MUF | Maximum Usable Frequency |
| MURS | Multi Use Radio System |
| MW | Medium Wave |
| N | Neill (A type of RF connector) |
| NAVTEX | NAVigational TEleX |
| NB | Noise Blanker |
| NDB | Non-Direactional Beacon |
| NFM | Narrow Frequency Modulation (Ambiguous, usually a BW of approximately 10 or 16 KHz, depending
on manufacturer, but in modern terms, a BW of max ~10 KHz (±2.5 KHz deviation) would be more correct) |
| NIM | Network Interface Module (Basically a tuner and demodulator in one unit) |
| NOAA | National Oceanographic and Atmospheric Administration |
| NOMS | New Old Military Stock |
| NOS | New Old Stock |
| NPTH | Non-Plated Through Holes |
| NR | Noise Reduction |
| NRC | Noise Reduction Circuit |
| NTSC | National Television Systems Committee. (525 lines) |
| NVIS | Near Vertical Incidence Skywave |
| OFDM | Orthogonal Frequency Division Multiplexing |
| OIRT | Organisation Internationale de Radiodiffusion et de Television |
| OOK | On-Off Keying |
| PA | Power Amplifier |
| PAL | Phase Alternating Line |
| PAM | Pulse Amplitude Modulation |
| PAS | Personal Access System |
| PBT | Pass Band Tuning |
| PCB | Printed Circuit Board |
| PCM | Pulse Code Modulation |
| PDIP | Plastic Dual In-line Package |
| PDSL | Power line Digital Subscriber Line |
| PFC | Power Factor Correction |
| PHEMT | Pseudomorphic High Electron Mobility Transistor |
| PHS | Personal Handy-phone System |
| PIM | Passive InterModulation |
| PL | Private Line (Same as CTCSS, but a Motorola trademark) |
| PLB | Personal Locating Beacon |
| PLC | Power Line Communication/Carrier |
| PLL | Phase Locked Loop |
| PLN | Power Line Networking |
| PLT | Power Line Telecom |
| PM | Phase Modulation |
| PMR | Personal Mobile Radio |
| POCSAG | Post Office Code Standardization Advisory Group |
| PPM | Pulse Position Modulation |
| PSK | Phase Shift Keying |
| PSOC | Programmable System-On-Chip |
| PSOP | Plastic Small Outline Package |
| PTH | Plated Through Holes |
| PTS | Post & TeleStyrelsen (Swedish Post & Telecom Agency) |
| PTT | Push To Talk |
| PTZ | Pan-Tilt-Zoom (Cameras) |
| QAM | Quadrature Amplitude Modulation |
| QFN | Quad Flat No-lead package |
| QFP | Quad Flat Package |
| QPSK | Quad Phase Shift Keying |
| QSOP | Quarter size Outline Package |
| RACES | Radio Amateur Civil Emergency Service |
| RADAR | RAdio Detection And Ranging |
| RAKEL | RAdioKommunikation för Effektiv Ledning. The police/fire/ambulance TETRA network in Sweden |
| RAPS | Räddningstjänst, Ambulans, Polis och SOS Alarm (Sweden) |
| RDD | Radar detector detector |
| RDF | Radio Direction Finding |
| RED | Radio Equipment Directive |
| RF | Radio Frequency |
| RFID | Radio Frequency IDentification |
| RIT | Receiver Incremental Tuning |
| RMDR | Reciprocal Mixing Dynamic Range |
| RMS | Root Mean Square |
| RO | Radio Operator |
| RoHS | Restriction of certain Hazardous Substances |
| RPT | Repeater |
| RSGB | Radio Society of Great Britain |
| RSS | Radio Service Software (Motorola) |
| RSSI | Received Signal Strength Indicator |
| R&TTE | Radio & Telecommunications Terminal Equipment |
| RTTY | Radio TeleTYpe |
| RX | Receive/Receiver |
| RöV | Röntgenverordnung (X-ray regulation), in Germany |
| SAME | Specific Area Message Encoding |
| SAR | Search And Rescue |
| SARL | South African Radio League |
| SART | Search And Rescue Transponder |
| SCR | Silicon Controlled Rectifier (A type of thyristor) |
| SDR | Software Defined Radio |
| SHF | Super High Frequency (3 - 30 GHz) |
| SINE | The police/fire/ambulance TETRA network in Denmark |
| SIMM | Single In-line Memory Module |
| SIP | Single In-line Package |
| SIPP | Single In-line Pin Package |
| SIRESP | The police/fire/ambulance TETRA network in Portugal |
| SITOR | SImplex Telex Over Radio |
| SK | Silent Key (Deceased) |
| SMA | Surface-Mount Assembly (Module assembled with SMT) |
| SMC | Surface-Mount Components |
| SMD | Surface-Mount Device |
| SMP | Surface-Mount Packages (SMD case forms) |
| SMT | Surface-Mount Technology |
| SoC | System-On-a-Chip |
| SOD | Small Outline Diode |
| SOIC | Small Outline Integrated Circuit |
| SOJ | Small Outline J-leaded package |
| SOP | Small Outline Package |
| SOT | Small Outline Transistor |
| SRBR | Short Range Business Radio |
| SRD | Short Range Device |
| SSB | Single Side Band |
| SSDV | Slow Scan Digital Video - A packetised digital form of SSTV |
| SSOP | Shrink Small Outline Package |
| SSPA | Solid State Power Amplifier |
| SSR | Secondary Surveillance Radar |
| SST | Spread Spectrum Technology |
| SSTV | Slow Scan TeleVision |
| STS | Special Telecommunications Service. The police/fire/ambulance TETRA network in Romania |
| SW | Shortwave |
| SwMI | Switching and Management Infrastructure |
| SWR | Standing Wave Ratio |
| TAC | TalkAround Channel |
| TACS | Total Access Communication System. A variant of AMPS |
| TBS | TETRA Base Station |
| TCA | Time of Closest Approach |
| TCXO | Temperature Compensated Xtal Oscillator |
| TDMA | Time Division Multiple Access |
| TDOA | Time Difference Of Arrival |
| TEA | TETRA Encryption Algorithm |
| TEP | TransEquatorial Propagation |
| TETRA | TErrestial Trunked RAdio |
| TETRON | The police/fire/ambulance TETRA network in Austria |
| THz | TeraHertz (1 THz = 1000 GHz) |
| TMC | Traffic Message Channel |
| TMO | Trunked Mode Operation (TETRA) |
| TNC | Terminal Node Controller (Basically a packet modem with built-in advanced functions under CPU control) |
| TNC | Threaded Neill Concelman (A type of RF connector) |
| TRRS | Tip Ring Ring Sleeve - A type of 4-pole, 3.5 mm (1/8") connector, also called "minijack". |
| TRS | Tip Ring Sleeve - A type of 3-pole, 3.5 mm (1/8") connector, also called "minijack". |
| TS | Tip Sleeve - A type of 2-pole, 3.5 mm (1/8") connector, also called "minijack". |
| TS | Tuning Steps |
| TSOP | Thin Small Outline Package |
| TSOT | Thin Small Outline Transistor |
| TSSOP | Thin Shrink Small Outline Package |
| TT&C | Telemtry, Tracking and Command |
| TV | TeleVision |
| TWS | Traffic Warning System (Safety alerts) |
| TX | Transmit/Transmitter |
| UHF | Ultra High Frequency (300 - 3000 MHz) |
| UMTS | Universal Mobile Telephone System |
| USB | Upper Side Band |
| V | Volt |
| Vcc | Positive supply (originally on a bipolar component). Most common in all modern IC datasheets |
| Vdd | Positive supply (originally on a FET/CMOS component) |
| VDMOS | Vertical laterally Double-diffused Metal Oxide Semiconductor |
| Vee | Negative supply or ground (originally on a bipolar component). Most modern datasheets now refers to Gnd |
| VFD | Vacuum Fluorescent Display |
| VFO | Variable Frequency Oscillator |
| VHF | Very High Frequency (30 - 300 MHz) |
| VIRVE | The police/fire/ambulance TETRA network in Finland |
| VLF | Very Low Frequency (3 - 30 KHz) |
| VMSK | Very Minimum Shift Keying |
| VNA | Vector Network Analyzer |
| VoIP | Voice over Internet Protocol |
| VOR | VHF Omnidirectional Radio range |
| VOX | Voice Operated switch / Voice Operated eXchange |
| VPA | Voltage Probe Antenna |
| Vpp | Programming voltage (usually on a memory chip or MCU) |
| VSB | Vestigial Side Band |
| WSPR | Weak Signal Propagation Reporter |
| Vss | Negative supply or ground (originally on a FET/CMOS component). Most modern datasheets now refers to Gnd |
| VSWR | Voltage Standing Wave Ratio |
| VTS | Vessel Traffic Service |
| VTVM | Vacuum Tube VoltMeter |
| WDECT | Wideband Digital Enhanced Cordless Telecommunications |
| WEEE | Waste Electrical and Electronic Directive |
| WFM | Wide Frequency Modulation (Normal broadcast FM quality, about 150-230 KHz BW) |
| WiRES-II | Wide-coverage InteRnet Enhancement System version 2 (A VoIP system introduced in 2002 by Yaesu) |
| WVDC | Working Volts Direct Current |
| XFC | Transmit Frequency Check |
| XIT | Transmitter Incremental Tuning |
| XTAL | Crystal |
| ZF | ZwischenFrequenz (German) = Intermediate frequency |
