All Identified Signals

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== Description ==

Description

This is the complete list of all identified signals in our Signal Identification Guide ordered in alphabetical order. There are currently 319 identified signals in our database.

Browse List of Known Signals in Database

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Click the name of a signal to see more detailed information, possible decoding, and additional sound and waterfall samples
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Signal type Description Frequency Mode Modulation Bandwidth Location Sample Audio Waterfall image
'Ghadir' OTH Radar 'Ghadir', is an Iranian over the horizon radar, part of Iran's Sepehr Phased Radar System. 28 MHzMegaHertz (MHz) 10^6 Hz — 29.7 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation Pulse 60 kHzKiloHertz (kHz) 10^3 Hz — 1 MHzMegaHertz (MHz) 10^6 Hz Iran IranOTH.png
29B6 'Kontayner' OTH Radar 29B6, nicknamed 'Kontayner', is a Russian over the horizon radar. It is currently very active in Europe. 6.1 MHzMegaHertz (MHz) 10^6 Hz — 32 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FMOP 3.5 kHzKiloHertz (kHz) 10^3 Hz — 28 kHzKiloHertz (kHz) 10^3 Hz Russia Kontainer.png
2G CDMA (IS-95) 2G CDMACode Division Multiple Access, also known as IS-95, is a cellular standard. 850 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation QPSKQuadrature Phase-Shift Keying (2 bits per symbol) 1.228 MHzMegaHertz (MHz) 10^6 Hz Is95 narrow.PNG
3G WCDMA CDMA2000, known primarily as 3G mobile, is a family of 3G data protocols used to send voice, text and signaling data to cell phones and other wireless devices. 824 MHzMegaHertz (MHz) 10^6 Hz — 2,000 MHzMegaHertz (MHz) 10^6 Hz RAW, AMAmplitude Modulation QAMQuadrature Amplitude Modulation, QPSKQuadrature Phase-Shift Keying (2 bits per symbol), CDMACode Division Multiple Access 1.25 MHzMegaHertz (MHz) 10^6 Hz — 3.9 MHzMegaHertz (MHz) 10^6 Hz 3gwcdma 1936 iqremoval sigidwiki.PNG
4G LTE Network Long Term Evolution Network. Also known as 4G LTE Data and Evolved Universal Terrestrial Radio Access (E-UTRA). Data service for wireless consumer devices. 700 MHzMegaHertz (MHz) 10^6 Hz — 2,200 MHzMegaHertz (MHz) 10^6 Hz RAW OFDMOrthogonal Frequency-Division Multiplexing, PSKPhase-Shift Keying, QAMQuadrature Amplitude Modulation MHzMegaHertz (MHz) 10^6 Hz — 20 MHzMegaHertz (MHz) 10^6 Hz Worldwide LTE Thumb.jpg
AFSK Paging Link It is easier to transmit the FSKFrequency-Shift Keying pager signal to the transmitter site as AFSKAudio Frequency-Shift Keying. It is changed to POCSAG format when re-transmitted. 72 MHzMegaHertz (MHz) 10^6 Hz — 928 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation AFSKAudio Frequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide AFSKPaging Waterfallthmb.jpg
ALE-400 ALEAutomatic Link Establishment-400 is an amateur version of the 2G ALEAutomatic Link Establishment standard. It is adapted to the demands of amateur radio emergency traffic handling. 1.806 MHzMegaHertz (MHz) 10^6 Hz — 144.163 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ALE-400.jpg
AMSAT-P3D AMSAT-P3D (Known as Phase 3D, OSCAR-40, and AO-40) is a amateur radio satellite built by AMSAT. As of 2004, the satellite's systems have failed. 145.805 MHzMegaHertz (MHz) 10^6 Hz — 24,048.285 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 1.6 kHzKiloHertz (kHz) 10^3 Hz Worldwide SAT 40.jpg
ARQ-E(E3) ARQAutomatic Repeat reQuestAutomatic Repeat Query-E, also known as ARQAutomatic Repeat reQuestAutomatic Repeat Query-1000 Duplex or ARQAutomatic Repeat reQuestAutomatic Repeat Query-1000D, is a synchronous full-duplex ARQAutomatic Repeat reQuestAutomatic Repeat Query system. ARQAutomatic Repeat reQuestAutomatic Repeat Query-E3 is a variant that uses a different alphabet encoding. Mainly used by French Military Forces. Stations commonly idled for hours on end. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 85 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 850 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ARQE3192Bd.png
ARQ-M2-242 ARQAutomatic Repeat reQuestAutomatic Repeat Query-M2-242 (Also known as TDM 242, TDM-2, 96-TDM, and ARQAutomatic Repeat reQuestAutomatic Repeat Query-28) is a two-channel time division multiplexed telex system. This is the CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) 242 standard version. Used in Aeronautical, Marine, and Point-to-Point services. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ARQ-M2-242.jpg
ARQ-M2-342 ARQAutomatic Repeat reQuestAutomatic Repeat Query-M2-342 (Also known as TDM 342, TDM-2, 96-TDM, and ARQAutomatic Repeat reQuestAutomatic Repeat Query-28) is a two-channel time division multiplexed telex system. This is the CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) 342 standard version. Used in Aeronautical, Maritime, and Point-to-Point services. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ARQ-M2-342.jpg
ARQ-M4-242 ARQAutomatic Repeat reQuestAutomatic Repeat Query-M4-242 (Also known as TDM 242, TDM-4, 192-TDM, and ARQAutomatic Repeat reQuestAutomatic Repeat Query-56) is a four-channel time division multiplexed telex system. This is the CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) 242 standard version. Used in Aeronautical, Maritime, and Point-to-Point services. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ARQ-M4-242.jpg
ARQ-M4-342 ARQAutomatic Repeat reQuestAutomatic Repeat Query-M4-342 (Also known as TDM 342, TDM-4, 192-TDM, and ARQAutomatic Repeat reQuestAutomatic Repeat Query-56) is a four-channel time division multiplexed telex system. This is the CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) 342 standard version. Used in Aeronautical, Maritime, and Point-to-Point services. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ARQ-M4-342.jpg
ARQ-N ARQAutomatic Repeat reQuestAutomatic Repeat Query-N is a synchronous dual channel ARQAutomatic Repeat reQuestAutomatic Repeat Query mode identical to ARQAutomatic Repeat reQuestAutomatic Repeat Query-E, with the only difference being that ARQAutomatic Repeat reQuestAutomatic Repeat Query-N has no symbol inversions. Formerly used by Italian Diplomatic services. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 85 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 850 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ARQ-N.jpg
ARQ6-90 ARQ6-90, also known as ARQAutomatic Repeat reQuestAutomatic Repeat Query-6-90 and ARQAutomatic Repeat reQuestAutomatic Repeat Query-6/90, is a 6-character block simplex ARQAutomatic Repeat reQuestAutomatic Repeat Query system formerly used by French and Italian diplomatic services exchange of teletype-data. It is no longer used or seen today. 10 MHzMegaHertz (MHz) 10^6 Hz — 23 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 700 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ARQ 6-90.jpg
ARQ6-98 ARQ6-98, also known as ARQAutomatic Repeat reQuestAutomatic Repeat Query-6-98 and ARQAutomatic Repeat reQuestAutomatic Repeat Query-6/98, is a 6-character block simplex ARQAutomatic Repeat reQuestAutomatic Repeat Query system formerly used by French and Italian diplomatic services for the exchange of teletype-data. It is no longer used or seen today. 10 MHzMegaHertz (MHz) 10^6 Hz — 23 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ARQ 6-98.jpg
ASCII ASCII (also known as ITA5 or IRA) is an amateur radio telegraphy signal using the ITA-5 alphabet. MHzMegaHertz (MHz) 10^6 Hz — 450 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation, USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ASCII.jpg
ATSC Broadcast Advanced Television Systems Committee Television. 8VSB Modulation 54 MHzMegaHertz (MHz) 10^6 Hz — 700 MHzMegaHertz (MHz) 10^6 Hz RAW 8VSB MHzMegaHertz (MHz) 10^6 Hz North America ATSCthmb.jpg
AUTOSPEC AUTOSPEC is a synchronous FECForward Error Correction teletype system used by British coastal stations to communicate with North Sea oil rigs. Also known as Autospec-bauer, Bauer, and Autospec Mk1. This signal is most likely phased out. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide AUTOSPEC.png
Accurate positioning by Low Frequencies (ALF) Accurate positioning by Low Frequencies, a former German DGPS navigation system. No longer in use as of 2013. 123.7 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.1 kHzKiloHertz (kHz) 10^3 Hz Germany ALF-RDS.jpg
Aircraft Communications Addressing and Reporting System (ACARS) Short messages sent to and from aircraft 129 MHzMegaHertz (MHz) 10^6 Hz — 137 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation MSKMinimum-Shift Keying (When Shift/Bd = 0.5. It is impossible to get this ratio to be lower than 0.5, hence it is called the 'Minimum' shift.) kHzKiloHertz (kHz) 10^3 Hz Worldwide ACARS.jpg
Amplitude Modulation (AM) Long range commercial broadcast and international radio. Also used for aviation communications. 153 kHzKiloHertz (kHz) 10^3 Hz — 137 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation AMAmplitude Modulation 10 kHzKiloHertz (kHz) 10^3 Hz Worldwide AM radio.jpg
Amplitude Modulation Signalling System (AMSS) Amplitude Modulation Signalling System (AMSS) is a DRM-based radiotext and data technology for AMAmplitude Modulation broadcasting, like RDS that is used for FMFrequency Modulation. It transmits as a subcarrier, phase-modulating the carrier frequency. 100 kHzKiloHertz (kHz) 10^3 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz SSB AMAmplitude Modulation (PSKPhase-Shift Keying) 200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). AMSS.jpg
Autocab This is an example of the Autocab Media Data Terminals used by cab companies all over the world. 163.375 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying 12.5 kHzKiloHertz (kHz) 10^3 Hz UK Autocab.jpg
Automated Train Control System (ATCS) Automated Train Control System (ATCS), specifically ATCS Spec. 200, is a standardized communication system for railroads designed to ensure safety by monitoring locations of trains and locomotives, providing analysis and reporting, and automation of track warrants and similar orders. 896 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 936 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying 12.5 kHzKiloHertz (kHz) 10^3 Hz North America Atcs.png
Automatic Dependent Surveillance-Broadcast (ADS-B) ADS-B is used by aircraft as an alternative to secondary radar. It broadcasts GPS position (latitude, longitude), pressure, altitude, callsign, as well as track and ground speed separated into messages carrying 10 bytes of data each. 1,090 MHzMegaHertz (MHz) 10^6 Hz RAW PPMPulse Position Modulation 50 kHzKiloHertz (kHz) 10^3 Hz Worldwide ADS-B.jpg
Automatic Identification System (AIS) Automatic Identification System (AIS) is used by ships to broadcast position and vessel information. 161.975 MHzMegaHertz (MHz) 10^6 Hz — 162.025 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation GMSKGaussian Minimum-Shift Keying 25 kHzKiloHertz (kHz) 10^3 Hz Worldwide AIS.jpg
Automatic Link Establishment (2G ALE) Automatic Link Establishment, 2G ALEAutomatic Link Establishment (Official designation MIL-STD-188-141A and/or MIL-STD-188-141B (Appendix A)) is the current standardized method of establishing connections between radio operators. Also known as FED-STD 1045, FED-STD 1049, and STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 5066. 3.068 MHzMegaHertz (MHz) 10^6 Hz — 28.313 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide ALE2G.jpg
Automatic Link Establishment (3G ALE ARCS) 3G ALEAutomatic Link Establishment (ARCSAutomatic Radio Control System) is the next generation of ALEAutomatic Link Establishment (Designated by MIL-STD-188-141B (Appendix C)). Also known as STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4538. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide 3Gale.jpg
Automatic Link Set-up (ALIS) Automatic Link Set-up (ALIS) is an automatic link system used by Rohde & Schwarz modems. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 270 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide ALIS.jpg
Automatic Packet Reporting System (APRS) Packet system for real time data communications. Used by hams for location reporting, weather stations etc. 144.39 MHzMegaHertz (MHz) 10^6 Hz — 145.57 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation AFSKAudio Frequency-Shift Keying 10 kHzKiloHertz (kHz) 10^3 Hz Worldwide APRS.jpg
Automatic Picture Transmission (APT) Automatic Picture Transmission (APT), also known as NOAA-GEOSAT, is an analog image transmission mode used to by the NOAA weather satellites and some Russian weather satellites to transmit satellite weather photos. 137 MHzMegaHertz (MHz) 10^6 Hz — 138 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation AMAmplitude Modulation 34 kHzKiloHertz (kHz) 10^3 Hz Worldwide APT NOAA.jpg
Automatic Transmitter Identification System (ATIS) ATIS systems are identification tags used by inland commercial waterway traffic on rivers in Europe. The FSKFrequency-Shift Keying burst is appended at the end of every voice transmission by the vessel operator. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying 12 kHzKiloHertz (kHz) 10^3 Hz Europe ATIS voice samp.jpg
BMW Key-Code signal This coded signal was sent by BMW Car-Key. It is used to open and lock bimmer doors. 433 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation ASKAmplitude-Shift Keying 10 kHzKiloHertz (kHz) 10^3 Hz Worldwide BMW Key Code.jpg
BPC BPC is the callsign of the Chinese low-frequency time broadcasting station, located near Shangqiu, Henan in China. 68.5 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) AMAmplitude Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). China BPC.jpg
BPM BPM is a time signal transmitted by the Chinese Academy of Sciences, broadcasting from CAS's National Time Service Center in Pucheng County, China. 2.5 MHzMegaHertz (MHz) 10^6 Hz — 15 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation AMAmplitude Modulation 3.5 kHzKiloHertz (kHz) 10^3 Hz China BPM.jpg
BR-6028 BR-6028 is a VFTVoice Frequency Telegraphy (Voice Frequency Telegraph) frequency and time diversity modem using 7 data channels. It is sometimes also known as BARRIE, USA-7, or 6028. 5.75 MHzMegaHertz (MHz) 10^6 Hz — 15.937 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 3.1 kHzKiloHertz (kHz) 10^3 Hz Worldwide BR-6028 RTTY.jpg
Binary Interchange of Information and Signaling (BIIS) BIIS (also known as BIIS 1200) is an ETSIEuropean Telecommunications Standards Institute. An independent, not-for-profit, standardization organization in the telecommunications industry in Europe, developing global telecommunications standards. protocol for a digital selective calling method with the added benefit of extended capability of transmitting data that exceeds what could be done with old 5-tone analog calling methods like CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) and ZVEI. 35 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FFSKFast Frequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Europe BIISthmb.jpg
CCIR 493-4 Selcall CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) 493-4 Selcall, also known as HFHigh Frequency (3-30 MHz) Selcall, Australian Selcall, and Codan 8580 Selcall, is a Selcall standard developed in Australia for the HFHigh Frequency (3-30 MHz) band. Used by Amateur radio and Codan Modems. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Ccir 493.jpg
CCIR Selcall CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) selcall consists of CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R)-1, CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R)-2, and PCCIR, which are 5-tone selcall modes for VHFVery High Frequency (30-300 MHz)/UHFUltra High Frequency (300-3000 MHz) radios. CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R)-1 and CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R)-2 only differ in the tone duration, and PCCIR only differs in the group, reset, and repeat tone frequencies. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide Ccir-1 5-tone.jpg
CCITT CCITT is a 5-tone selcall system for VHFVery High Frequency (30-300 MHz)/UHFUltra High Frequency (300-3000 MHz) radios. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide Ccitt 5-tones.jpg
CHIP CHIP, or CHIP64, is a spread-spectrum PSKPhase-Shift Keying mode developed by Antonino Porcino IZ8BLY. 7.09 MHzMegaHertz (MHz) 10^6 Hz — 14.11 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 580 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide CHIP.jpg
CHU CHU is a time signal radio station operated by the Institute for National Measurement Standards of the National Research Council of Canada. 3.33 MHzMegaHertz (MHz) 10^6 Hz — 14.67 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying, OOKOn-Off Keying Modulation 2.25 kHzKiloHertz (kHz) 10^3 Hz Canada CHU.jpg
CIS 3x100 VFT Three CISCommonwealth of Independent States (CIS), the former Soviet Republic-14 signals overlaid on top of each other in a 3100 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). VFTVoice Frequency Telegraphy bandwidth, operating at 100 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 3.1 kHzKiloHertz (kHz) 10^3 Hz Russia CIS3x100bd.jpg
CIS 3x144 VFT Three 144 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. FSKFrequency-Shift Keying signals in a 3100 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). VFTVoice Frequency Telegraphy bandwidth. Reportedly phased out. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 3.1 kHzKiloHertz (kHz) 10^3 Hz Russia CIS3x144bdtfc.jpg
CIS 3xBaudot-50 VFT Three 50 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. Baudot signals in a 3100 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). VFTVoice Frequency Telegraphy bandwidth. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 3.1 kHzKiloHertz (kHz) 10^3 Hz Russia 284px-CIS3xbaudot50bd.jpg
CIS MFSK-16 XPA2 Enigma Designation XPA2, also known as MFSKMultiple Frequency Shift-Keying-16, CISCommonwealth of Independent States (CIS), the former Soviet Republic MFSKMultiple Frequency Shift-Keying-14, and CISCommonwealth of Independent States (CIS), the former Soviet Republic MFSKMultiple Frequency Shift-Keying-16, is a 14-tone MFSKMultiple Frequency Shift-Keying signal said to have origin from Russian Intelligence and Foreign Ministry stations. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia XPA2.png
CIS MFSK-20 XPA Enigma Designation XPA, also known as MFSKMultiple Frequency Shift-Keying-20, CISCommonwealth of Independent States (CIS), the former Soviet Republic MFSKMultiple Frequency Shift-Keying-17, and CISCommonwealth of Independent States (CIS), the former Soviet Republic MFSKMultiple Frequency Shift-Keying-20, is a 17-tone MFSKMultiple Frequency Shift-Keying signal said to have origin from Russian Intelligence and Foreign Ministry stations. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 800 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia XPA10.png
CIS MFSK-68 New Russian MFSKMultiple Frequency Shift-Keying Modem that uses 68 MFSKMultiple Frequency Shift-Keying (5 tones at a time) as well as a 9000 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. 8-PSK8-Phase Phase-Shift Keying (3 bits per symbol) insert every second which spans 10 kHzKiloHertz (kHz) 10^3 Hz wide. This signal is often found attributed with CISCommonwealth of Independent States (CIS), the former Soviet Republic-3000, where CISCommonwealth of Independent States (CIS), the former Soviet Republic-3000 acts as the ALEAutomatic Link Establishment for this signal as well as CISCommonwealth of Independent States (CIS), the former Soviet Republic-128. 7.659 MHzMegaHertz (MHz) 10^6 Hz — 18.28 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying, PSKPhase-Shift Keying 10 kHzKiloHertz (kHz) 10^3 Hz Russia CIS MFSK-68.jpg
CIS OFDM HDR Modem Russian OFDMOrthogonal Frequency-Division Multiplexing HDR (High Data Rate) Modem. Has three main modes: CISCommonwealth of Independent States (CIS), the former Soviet Republic-45, CISCommonwealth of Independent States (CIS), the former Soviet Republic-60, and CISCommonwealth of Independent States (CIS), the former Soviet Republic-93, corresponding to the number of OFDMOrthogonal Frequency-Division Multiplexing tones in the signal. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 2.8 kHzKiloHertz (kHz) 10^3 Hz — 3 kHzKiloHertz (kHz) 10^3 Hz Russia CIS-45 33bd.jpg
CIS-11 CISCommonwealth of Independent States (CIS), the former Soviet Republic-11 (Also known as TORG-11) is a radio duplex teleprinter system used by Russian meteorological stations MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 650 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia CIS-11.jpg
CIS-112 CISCommonwealth of Independent States (CIS), the former Soviet Republic-112 OFDMOrthogonal Frequency-Division Multiplexing signal. Has a preamble of 7 Tones (not including carrier), then 56 tones before entering into the 112 tone data transmission. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing kHzKiloHertz (kHz) 10^3 Hz Russia CIS-112 pramb.jpg
CIS-12 CISCommonwealth of Independent States (CIS), the former Soviet Republic-12 (Also known as MS5, FIRE, AT-3004D, or AT-3104D) is a 12-tone PSKPhase-Shift Keying Russian military multi-channel modem. 7.026 MHzMegaHertz (MHz) 10^6 Hz — 14.6 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 3.1 kHzKiloHertz (kHz) 10^3 Hz Russia CIS-12.jpg
CIS-128 CISCommonwealth of Independent States (CIS), the former Soviet Republic-128 is an OFDMOrthogonal Frequency-Division Multiplexing mode that uses 128 channels, with one “off” channel in the center, so the signal is divided into two 64 channel parts. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing, QAMQuadrature Amplitude Modulation 3.1 kHzKiloHertz (kHz) 10^3 Hz — 6.1 kHzKiloHertz (kHz) 10^3 Hz Russia CIS-128.jpg
CIS-1280 CISCommonwealth of Independent States (CIS), the former Soviet Republic-1280 is a OQPSK (Offset Quadrature Phase Shift-Keying) modulation data modem signal. Also known as Soviet Mil(MOD)/FAPSIFederal Agency of Government Communications and Information (Russian Agency)/PTTPush To TalkPress to TransmitMinistries of Postal, Telephone, and Telegraph Service (Soviet Agency) system. These stations are recognizable in that they are all placed on .081 offsets from a kilohertz or half kilohertz point. MHzMegaHertz (MHz) 10^6 Hz — 13.369 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 1.28 kHzKiloHertz (kHz) 10^3 Hz Russia CIS-1280.jpg
CIS-14 Also known as AMOR and AMOR96. Synchronous FSKFrequency-Shift Keying duplex teleprinter system with ARQAutomatic Repeat reQuestAutomatic Repeat Query. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 650 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia CIS-14TFC.jpg
CIS-16 CISCommonwealth of Independent States (CIS), the former Soviet Republic-16 is a BPSKBinary Phase-Shift Keying (1 bit per symbol) 16-tone mode, possibly transmitted from a modified AT-3004D or AT-3104 type Russian military transceiver. Also known as CISCommonwealth of Independent States (CIS), the former Soviet Republic 16x75 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. for the 75 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. speed in each of the 16 sub channels. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.7 kHzKiloHertz (kHz) 10^3 Hz Russia CIS-16Tfcc.jpg
CIS-20 Russian AT-3104 Modem signal, 20-tone OFDMOrthogonal Frequency-Division Multiplexing DQPSKDifferential Quadrature Phase-Shift Keying signal MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 2.75 kHzKiloHertz (kHz) 10^3 Hz Russia CIS-20.jpg
CIS-300 Known as CISCommonwealth of Independent States (CIS), the former Soviet Republic-300 Burst, FSKFrequency-Shift Keying mode used with 300 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. rate with a starting and ending tone on the upper part of the signal. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 370 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia CIS-300.jpg
CIS-3000 CISCommonwealth of Independent States (CIS), the former Soviet Republic-3000 is an 8-PSK8-Phase Phase-Shift Keying (3 bits per symbol) Data Modem protocol. It's source is traced to Russia. 3000 is for its 3000 BaudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. speed (maximum speed is technically 9000 bpsBits per second (bps)). MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 3.4 kHzKiloHertz (kHz) 10^3 Hz Russia CIS-3000.jpg
CIS-36-50 CISCommonwealth of Independent States (CIS), the former Soviet Republic-36-50, also known as BEE-36 and T-600, is an FSKFrequency-Shift Keying modem used by the Russian Navy. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 550 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia CIS-36-50.jpg
CIS-40.5 CISCommonwealth of Independent States (CIS), the former Soviet Republic-40.5 (Also known as T-206) is an FSKFrequency-Shift Keying signal used in Russian Military Communications Equipment. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia CIS-40.5.jpg
CIS-48 CISCommonwealth of Independent States (CIS), the former Soviet Republic-48 is an interesting data mode with a unique format. It uses a 4 DBPSK Preamble with a constant tone and changing OFDMOrthogonal Frequency-Division Multiplexing modes as it transmits data. Origin is suspected to be in Russia. 5.017 MHzMegaHertz (MHz) 10^6 Hz — 17.289 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying MHzMegaHertz (MHz) 10^6 Hz — 3 MHzMegaHertz (MHz) 10^6 Hz Russia CIS-48.jpg
CIS-50-50 CISCommonwealth of Independent States (CIS), the former Soviet Republic-50-50 is very similar to CISCommonwealth of Independent States (CIS), the former Soviet Republic-36-50. The main difference is in the available baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. rates and frequency shifts used. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 150 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 630 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia CIS-50-50.jpg
CIS-8181 CISCommonwealth of Independent States (CIS), the former Soviet Republic-8181 is an FSKFrequency-Shift Keying modem used by the Russian navy. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia CIS-8181.jpg
CLOVER 2000 CLOVER 2000 is an upgrade to CLOVER-II, a digital data protocol developed by Ray Petit and HAL Communications. Sometimes referred to as XCLOVER or 8 Tone CLOVER. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, QAMQuadrature Amplitude Modulation kHzKiloHertz (kHz) 10^3 Hz Worldwide CLOVER-2000new.jpg
CLOVER 2500 CLOVER 2500 is a new upgrade to CLOVER-2000, adding 25% more speed to the CLOVER system. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, QAMQuadrature Amplitude Modulation 2.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide CLOVER-2500.jpg
CLOVER-I CLOVER-I was the first iteration of the Clover series of digital modes. Was never released for commercial use, replaced by CLOVER-II. Also known as Cloverleaf. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, QAMQuadrature Amplitude Modulation 100 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide CLOVER-I sim.jpg
CLOVER-II CLOVER-II is the advancement of CLOVER-I, with 4 tone pulses and a max data rate of 750 bpsBits per second (bps). Also known as Q-CLOVER and QUAD-CLOVER. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, QAMQuadrature Amplitude Modulation 500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide CLOVER-II.jpg
CODAR CODAR (Coastal Ocean Dynamics Applications Radar) is used for near-surface ocean monitoring, such as waves and water current. 4.438 MHzMegaHertz (MHz) 10^6 Hz — 42.5 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) ILFM 50 kHzKiloHertz (kHz) 10^3 Hz Worldwide CODARthm.jpg
CRY2001 Voice Scrambler CRY2001 is a voice scrambling mode used on Sailor CRY2001 Scramblers. Fisherman often use these modes to communicate with privacy. MHzMegaHertz (MHz) 10^6 Hz — 300 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide CRY2001 Full.jpg
CV-786 CV-786 is a wideband FSKFrequency-Shift Keying mode built in Rockwell-Collins MDM-2001 modems. Also known as TRC-75, as it was used in TRC-75 transceivers. A military-based Radio TeleTYpe mode. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 900 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide CV-786.jpg
California Smart-Meter This is a signal from a Californian Electricity 'Smart Meter'. Each house is now fitted with one of these, and they are strong - typically 50 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal. above the atmospheric noise level. 902 MHzMegaHertz (MHz) 10^6 Hz — 928 MHzMegaHertz (MHz) 10^6 Hz 15 kHzKiloHertz (kHz) 10^3 Hz United States Open-Way-Centron Smart-Meter Waterfallthmb.png
Chinese 4+4 Chinese 4+4, also known as 4+4 or PRC 4+4, is a multi-carrier transmission mode. It used by Chinese Diplomatic services with most traffic originating from Beijing, China. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.5 kHzKiloHertz (kHz) 10^3 Hz China CHN 4+4.jpg
Chinese Firedrake Jammer The Chinese Firedrake Jammer (also known as FireDragon) is a Commercial AMAmplitude Modulation Broadcast jamming signal that aims to jam specific radio stations in Asia from being received by listeners. It plays the chinese folk song "The Firedrake" to jam AMAmplitude Modulation radio stations. MHzMegaHertz (MHz) 10^6 Hz — 18 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation AMAmplitude Modulation 10 kHzKiloHertz (kHz) 10^3 Hz China CHN Jammer.png
Codan Data Modem Codan Data Modulation for Codan Data Modems. Has 3 distinct signals: Data, ALEAutomatic Link Establishment, and SELCAL. This modulation is used in Codan's 9001, 9002, 3012 and 3212 modems. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, FSKFrequency-Shift Keying 400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2.56 kHzKiloHertz (kHz) 10^3 Hz Worldwide Codan Modem.jpg
Code-Division Multiple Access (CDMA) CDMACode Division Multiple Access is another standard for Cellular Devices with GSM being the first standard. 850 MHzMegaHertz (MHz) 10^6 Hz — 1,900 MHzMegaHertz (MHz) 10^6 Hz RAW QPSKQuadrature Phase-Shift Keying (2 bits per symbol) 1.23 MHzMegaHertz (MHz) 10^6 Hz WORLDWIDE CDMA.jpg
Coherent BPSK Coherent BPSKBinary Phase-Shift Keying (1 bit per symbol), also known as C-BPSKBinary Phase-Shift Keying (1 bit per symbol), was an experimental amateur mode developed by Bill DeCarle VE2IQ. 138 kHzKiloHertz (kHz) 10^3 Hz — 18.081 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Coherent PSK.jpg
Coherent CW Coherent CWContinuous Wave (also known as CCW) was a strictly timed morse code mode designed by Ray Petit W7GHM (The same inventor of CLOVER). CCW depended on accurate timing from both receiver and transmitter. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) OOKOn-Off Keying Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Coherent CW.jpg
CompuLert Low speed FSKFrequency-Shift Keying telemetry to monitor and control warning sirens that are used to warn the public of threats such as tsunamis, severe weather, chemical spills and civil emergencies. 453.375 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide Compulert.jpg
Contestia Contestia, developed by Nick Fedoseev (UT2UZ) in 2005, is a digital mode derived from Olivia. It aims to deliver a compromise of speed and performance. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 150 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2 kHzKiloHertz (kHz) 10^3 Hz Worldwide Contestiathmb.png
Continuous Tone-Coded Squelch System (CTCSS) CTCSS, also known as Private Line and Channel Guard, is a low continuous tone transmitted on NFMNarrowband Frequency Modulation voice transmissions that is used to squelch and manage transmissions on a given frequency. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation CWContinuous Wave kHzKiloHertz (kHz) 10^3 Hz — 30 kHzKiloHertz (kHz) 10^3 Hz Worldwide CTCSS vce.jpg
Coquelet Coquelet is an MFSKMultiple Frequency Shift-Keying system, similar to Piccolo. Also known as COQ-8, COQ-12, and COQUELET 8 V 2. Uses ITA-2 charset. It's two main modes are Coquelet-8 and Coquelet-13. No longer in use. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Coq 8 intro.png
D-STAR D-STAR is a digital voice protocol used by ham radio. Is sometimes routed over the internet for international communications. 145.67 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying, GMSKGaussian Minimum-Shift Keying, 4FSK 6.25 kHzKiloHertz (kHz) 10^3 Hz Worldwide DSTAR.jpg
DCF77 DCF77 is a German longwave time signal radio station based at 77.5 kHzKiloHertz (kHz) 10^3 Hz. DCF uses an AMAmplitude Modulation modulated carrier and phase modulation sidebands to transmit it's time signal. 77.5 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) AMAmplitude Modulation, PSKPhase-Shift Keying 1.3 kHzKiloHertz (kHz) 10^3 Hz Germany DCF77.jpg
DUP-ARQ DUP-ARQAutomatic Repeat reQuestAutomatic Repeat Query, also known as ARTRAC and 125-ARTRAC, is a semi-duplex ARQAutomatic Repeat reQuestAutomatic Repeat Query system once used by Thai and Hungarian Diplomatic services. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 325 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide DUP ARQ.jpg
DUP-ARQ-2 DUP-ARQAutomatic Repeat reQuestAutomatic Repeat Query-2 (also known as ARTRAC II) is a further development of the DUP-ARQAutomatic Repeat reQuestAutomatic Repeat Query system and the system characteristics are very similar. DUP-ARQAutomatic Repeat reQuestAutomatic Repeat Query-2 allows transmission of ITA-2 (Baudot) or ITA-5 (ASCII) characters depending on the application. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 1.3 kHzKiloHertz (kHz) 10^3 Hz Worldwide DUP ARQ-2.jpg
DUP-FEC-2 DUP-FECForward Error Correction-2 is a further development of the DUP-ARQAutomatic Repeat reQuestAutomatic Repeat Query system and the system characteristics are very similar. Uses FECForward Error Correction instead of ARQAutomatic Repeat reQuestAutomatic Repeat Query and runs at either 125 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. or 250 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 1.1 kHzKiloHertz (kHz) 10^3 Hz Worldwide DUP FEC-2.jpg
Datawell Buoy HF Link Datawell Buoy HFHigh Frequency (3-30 MHz) Links transmitted by Datawell Marine measurement buoys, measuring ocean conditions, temperature, and wave current. 25.5 MHzMegaHertz (MHz) 10^6 Hz — 45 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying, MFSKMultiple Frequency Shift-Keying 200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Datawell 2FSK.jpg
Delfi-C3 Telemetry Delfi-C3 Telemetry is a telemetry signal sent from the Delfi-C3 university-class satellite. 145.87 MHzMegaHertz (MHz) 10^6 Hz LSBLower Side Band Modulation BPSKBinary Phase-Shift Keying (1 bit per symbol) Worldwide Delfi-C3.jpg
DeltaFix DeltaFix was a DGPS system that was used to provide precision positioning used in the survey and oceanographic industry. 1.7 MHzMegaHertz (MHz) 10^6 Hz — 3.4 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Deltafix.jpg
Differential Global Positioning System (DGPS) Differential GPS (DGPS), also known as M823 DGPS and SC-104 DGPS, is a supplementary correction signal used by GPS receivers to increase the accuracy of GPS based positioning. 283.5 kHzKiloHertz (kHz) 10^3 Hz — 2.95 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MSKMinimum-Shift Keying (When Shift/Bd = 0.5. It is impossible to get this ratio to be lower than 0.5, hence it is called the 'Minimum' shift.) 150 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide DGPS 200Bd.png
Digital Audio Broadcasting (DAB) A type of digital broadcast radio signal, containing multiple digital radio stations in the signal. 174.928 MHzMegaHertz (MHz) 10^6 Hz — 1,490.625 MHzMegaHertz (MHz) 10^6 Hz RAW OFDMOrthogonal Frequency-Division Multiplexing 1.537 MHzMegaHertz (MHz) 10^6 Hz Worldwide No Audio File DABthmb.jpg
Digital Audio Broadcasting + (DAB+) DAB+ is a type of digital broadcast radio signal, containing multiple digital radio stations in the signal. Here transmitted on channel 7D. 174 MHzMegaHertz (MHz) 10^6 Hz — 1,492 MHzMegaHertz (MHz) 10^6 Hz RAW OFDMOrthogonal Frequency-Division Multiplexing 1.5 MHzMegaHertz (MHz) 10^6 Hz Worldwide No Audio File DAB.jpg
Digital Dispatch Systems MDT Digital Dispatch Systems Mobile Data Terminal is a dispatching system used by taxi and private transportation companies. 152 MHzMegaHertz (MHz) 10^6 Hz — 854.788 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying kHzKiloHertz (kHz) 10^3 Hz United States MDT data terminals.jpg
Digital Enhanced Cordless Telecommunications (DECT) DECT is a ETSIEuropean Telecommunications Standards Institute. An independent, not-for-profit, standardization organization in the telecommunications industry in Europe, developing global telecommunications standards. standard for short range communications, mainly cordless phones. It uses a 10 channel/24 slots in a TDMATime Division Multiple Access FDD structure. Audio sample is 100 times slower than real for listening purposes. 1,880 MHzMegaHertz (MHz) 10^6 Hz — 1,900 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) GFSKGaussian Frequency-Shift Keying 1.6 MHzMegaHertz (MHz) 10^6 Hz Worldwide DECT waterfall.jpg
Digital Mobile Radio (DMR) Digital Mobile Radio (DMR) is an open digital mobile radio standard defined by ETSIEuropean Telecommunications Standards Institute. An independent, not-for-profit, standardization organization in the telecommunications industry in Europe, developing global telecommunications standards. and used in commercial products around the world. Mostly used by private network and local police, can be encrypted. Used in MOTOTRBO products. 136 MHzMegaHertz (MHz) 10^6 Hz — 860 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 4FSK 12.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide DMR.jpg
Digital Multimedia Broadcasting (DMB) Digital Multimedia Broadcasting (DMB) is a digital radio transmission technology developed in South Korea as part of the national IT project for sending multimedia such as TV, radio and datacasting to mobile devices such as mobile phones, laptops and GPS navigation systems. 174 MHzMegaHertz (MHz) 10^6 Hz — 216 MHzMegaHertz (MHz) 10^6 Hz DQPSKDifferential Quadrature Phase-Shift Keying-OFDMOrthogonal Frequency-Division Multiplexing 1.536 MHzMegaHertz (MHz) 10^6 Hz South Korea DMB-TDMB-Waterfall-01.jpg
Digital Private Mobile Radio (dPMR) dPMR is an open, non-proprietary trunked radio standard developed by ETSIEuropean Telecommunications Standards Institute. An independent, not-for-profit, standardization organization in the telecommunications industry in Europe, developing global telecommunications standards., published under ETSIEuropean Telecommunications Standards Institute. An independent, not-for-profit, standardization organization in the telecommunications industry in Europe, developing global telecommunications standards. TS 102 658. Supports both data and digital voice transmission. 149.019 MHzMegaHertz (MHz) 10^6 Hz — 446.2 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 4FSK 6.25 kHzKiloHertz (kHz) 10^3 Hz Worldwide DPMR.jpg
Digital Radio Mondiale (DRM) Digital Radio Mondiale (DRM) is a digital commercial broadcasting mode used to deliver FMFrequency Modulation-comparable sound quality to shortwave radio. 909 kHzKiloHertz (kHz) 10^3 Hz — 26.06 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) QAMQuadrature Amplitude Modulation, OFDMOrthogonal Frequency-Division Multiplexing 4.5 kHzKiloHertz (kHz) 10^3 Hz — 20 kHzKiloHertz (kHz) 10^3 Hz Worldwide DRMimage.png
Digital Video Broadcasting — Terrestrial (DVB-T) Digital Video Broadcasting — Terrestrial (DVB-T) is a digital broadcast television format used in Europe and in many other countries in the world. 474 MHzMegaHertz (MHz) 10^6 Hz — 786 MHzMegaHertz (MHz) 10^6 Hz RAW QAMQuadrature Amplitude Modulation, OFDMOrthogonal Frequency-Division Multiplexing MHzMegaHertz (MHz) 10^6 Hz — 8 MHzMegaHertz (MHz) 10^6 Hz Worldwide DVB-T.PNG
Distress Radiobeacon (Analog) Analog Distress Radiobeacons are simple siren-based transmitters that were installed in older EPIRB's, PLB's and ELT's. Currently used as a supplementary homing signal in modern digital radiobeacons. 121.5 MHzMegaHertz (MHz) 10^6 Hz — 243 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FMCW 10 kHzKiloHertz (kHz) 10^3 Hz Worldwide Analog radiobeacon.jpg
Distress Radiobeacon (Digital) Digital Distress Radiobeacons (EPIRB's, PLB's and ELT's) are emergency radio beacons used for search and rescue operations to locate a vessel, plane, or person in distress. 406 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying 1.4 kHzKiloHertz (kHz) 10^3 Hz Worldwide Epirb.jpg
Distributed Power Unit (DPU) Distributed power refers to the placing of an extra locomotive at an intermediate point in the middle section of a train. This locomotive unit is remotely controlled from the lead locomotive, and greatly increases both the pulling and stopping power of longer trains. 457.925 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz Worldwide DPU.jpg
DominoEX DominoEX, also known as just Domino, is an IFKIncremental Frequency Keying (Incremental Frequency Keying) mode developed by Murray Greenman ZL1BPU and Con Wassilieff ZL2AFP in 2004 that was the first fully developed iteration of the Domino IFKIncremental Frequency Keying family modes. Used to send text over RFRadio Frequency. 5.332 MHzMegaHertz (MHz) 10^6 Hz — 28.117 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) IFKIncremental Frequency Keying 173 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 524 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide DominoEX.png
DominoF DominoF was the first experimental implementation of the Domino family of IFKIncremental Frequency Keying modes, developed by Con ZL2AFP. DominoF used dual interleaved tone sets. Superseded by DominoEX. 1.838 MHzMegaHertz (MHz) 10^6 Hz — 28.08 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) IFKIncremental Frequency Keying 220 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide DominoF.png
Driftnet Buoy Radio Beacon Driftnet Radio Buoys are extensively used by fishing boats operating in open seas and oceans for collecting long fishing lines or fishing nets, with the assistance of a radio direction finder 1.6 MHzMegaHertz (MHz) 10^6 Hz — 28 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) OOKOn-Off Keying Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide DriftnetBuoyDrift.jpg
Dual Tone Multi Frequency (DTMF) DTMF is a signaling mode used for a variety of purposes. It's most known for telephony dialing, but is in use for many different applications such as DTMF paging for DTMF-enabled VHFVery High Frequency (30-300 MHz)/UHFUltra High Frequency (300-3000 MHz) radios. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying 3.3 kHzKiloHertz (kHz) 10^3 Hz Worldwide DTMF tones.png
ECG Telemetry This is ECG Telemetry from a pacemaker. 403.959 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Australia Beeper.png
EEA EEA is a 5-tone selcall mode defined by the Electronic Engineering Association in the United Kingdom. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide EEA 5-tone.jpg
EFR Teleswitch Europäische Funk-Rundsteuerung (EFR) Teleswitch (European Radio Ripple Control GmbH (ERA) Teleswitch) is an energy management system operated via long-wave radio. Uses two transmitters in Germany and one in Hungary. Also known by DCF39, DCF49 and HGA22. 129.1 kHzKiloHertz (kHz) 10^3 Hz — 139.9 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Central Europe EFR Teleswitch.jpg
EIA EIA is a 5/6-tone selcall mode defined by the Electronics Industries Association in the United States. Also known as Motorola MetroPage. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide EIA 5-tone.jpg
EURO EURO is a 5-tone selcall mode used in VHFVery High Frequency (30-300 MHz)/UHFUltra High Frequency (300-3000 MHz) radios. Also known as EuroSignal. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide Euro 5-tone.png
Emergency Alert System (EAS) The Emergency Alert System (EAS) is a national warning system in the United States, implemented since 1997, superceding the Emergency Broadcast System (EBS). 162.4 MHzMegaHertz (MHz) 10^6 Hz — 162.55 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz — 30 kHzKiloHertz (kHz) 10^3 Hz United States EAS NFM.jpg
End of Train Device (EOTD) Transmits train telemetry such as brake status and accidental seperation information to the head locomotive. 427.938 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz Worldwide EOTthmb.jpg
Enhanced Digital Access Communications System (EDACS) EDACS is a trunked radio system developed by General Electric and Ericsson. EDACS was invented by General Electric in the mid-80s and is currently owned by Harris Corporation. Harris has announced that EDACS systems will no longer be supported by 2017. 160 MHzMegaHertz (MHz) 10^6 Hz — 941 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation GFSKGaussian Frequency-Shift Keying 12.5 kHzKiloHertz (kHz) 10^3 Hz — 25 kHzKiloHertz (kHz) 10^3 Hz United States EDACS96 Waterfallthmb.png
European Radio Message System (ERMES) European Radio Message System (ERMES) is a European common standard for paging developed by the European Telecommunications Standards Institute (ESTI) 169.413 MHzMegaHertz (MHz) 10^6 Hz — 169.833 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PAMPulse Amplitude Modulation 25 kHzKiloHertz (kHz) 10^3 Hz Europe ERMES.jpg
FEC-A FECForward Error Correction-A, also known as FECForward Error Correction-100 or FECForward Error Correction-100A, is a synchronous simplex ARQAutomatic Repeat reQuestAutomatic Repeat Query system that uses the ITA 2 alphabet. This mode was once used by many embassies, diplomatic services, and news agencies worldwide. This mode was developed by Siemens. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 100 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 1.2 kHzKiloHertz (kHz) 10^3 Hz Worldwide FEC-A 96 Bd 400 Hz.jpg
FLEX FLEX (Flexible Wide Area Paging Protocol) is Motorola's high speed one-way paging protocol that supports 1600, 3200, and 6400 bpsBits per second (bps). FLEX can transmit tone, numeric, alphanumeric, and binary data. 169 MHzMegaHertz (MHz) 10^6 Hz — 929 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying, 4FSK kHzKiloHertz (kHz) 10^3 Hz Worldwide FLEX.jpg
FM Broadcast Radio Commercial Broadcast FMFrequency Modulation radio stations. Used for the broadcast of many different radio programs, including music, news, sports, weather, and talk shows. 65 MHzMegaHertz (MHz) 10^6 Hz — 108 MHzMegaHertz (MHz) 10^6 Hz WFMWideband Frequency Modulation FMFrequency Modulation 38 kHzKiloHertz (kHz) 10^3 Hz — 200 kHzKiloHertz (kHz) 10^3 Hz Worldwide Broadcast FM.jpg
FSK441 FSK441 is a high speed meteor scatter communication mode. FSK441 uses a baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. rate of 441 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. 144 MHzMegaHertz (MHz) 10^6 Hz — 444 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 1.75 kHzKiloHertz (kHz) 10^3 Hz Worldwide FSK441.jpg
FSQ Fast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015. 3.58 MHzMegaHertz (MHz) 10^6 Hz — 10.149 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) IFK+Offset Incremental Frequency Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide FSQ.png
FUNcube-1 Telemetry FUNcube-1 Telemetry is a telemetry signal sent from the Funcube-1 Cubesat amateur radio satellite. 145.935 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide FUNcube.jpg
FreeDV COHPSK FreeDV Coherent PSKPhase-Shift Keying (Also known as FreeDV 700) is a robust Digital Voice mode developed by David Rowe for his FreeDV Digital Voice Software. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 1.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide 700 tfc DV.png
Frequency Division Multiplex Digital Voice (FDMDV) Frequency Division Multiplex Digital Voice (FDMDV), also known as FDMDV 14+1-tone, is a digital voice mode originally developed by Peter Martinez G3PLX and Francesca Lanza HB9TLK. It has since been improved upon by David Rowe. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 1.125 kHzKiloHertz (kHz) 10^3 Hz — 1.3 kHzKiloHertz (kHz) 10^3 Hz Worldwide 1600 tfc DV.png
G-TOR Golay-Teleprinting Over Radio (G-TOR) is an FSKFrequency-Shift Keying proprietary standard developed by Kantronics Inc. and is used by radio amateurs, military (Irish Air Corps/Navy, Mexican army) and governmental agencies (ICRC). MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide G-TOR300.jpg
GM2100 (R&S) Advanced HFHigh Frequency (3-30 MHz) waveform for data transmission. R&S proprietary. PSK8, 2400 sps. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Europe GM2100 R&S.png
GMDSS Digital Selective Calling Global Maritime Distress and Safety System's Digital Selective Calling (GMDSS-DSC) is a maritime communication protocol intended to initiate ship-to-ship, ship-to-shore and shore-to-ship radiotelephone and MFMedium Frequency (300-3000 kHz)/HFHigh Frequency (3-30 MHz) radiotelex calls. 2.188 MHzMegaHertz (MHz) 10^6 Hz — 247.635 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide DSC GMDSS.jpg
Gandalf MDT Gandalf MDTMobile Data Terminal, A mobile data terminal (MDT) is a computerized device used in public transit vehicles, taxicabs, commercial trucking fleets, military logistics, and emergency vehicles, such as police cars, to communicate with a central dispatch office. was developed by Canadian company Gandalf Technologies. Used primarily by taxi and courier services in Canada and the United States. This protocol was used in Gandalf's Cabmate systems. 150 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 4FSK 10 kHzKiloHertz (kHz) 10^3 Hz Worldwide Gandalf.png
Glenayre Paging Link Glenayre's Paging Link. Links from paging head end to pager transmitter sites. Glenayre C2100/C2000 model control systems were likely to use this. 152.54 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation QAMQuadrature Amplitude Modulation United States NoWaterfallFiller.png
Global System for Mobile Communications (GSM) GSM is a 2G digital cellular network standard developed by ETSIEuropean Telecommunications Standards Institute. An independent, not-for-profit, standardization organization in the telecommunications industry in Europe, developing global telecommunications standards.. As of 2014 it has become the default global standard for mobile communications. 450 MHzMegaHertz (MHz) 10^6 Hz — 1,800 MHzMegaHertz (MHz) 10^6 Hz RAW GMSKGaussian Minimum-Shift Keying 200 kHzKiloHertz (kHz) 10^3 Hz Worldwide GSMthmb.jpg
Globe Wireless HF Network Globe Wireless' Maritime Digital Radio was a system of 24 stations around the globe offering data services to large cargo vessels. Since 2014, GW has discontinued their HFHigh Frequency (3-30 MHz) network. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, FSKFrequency-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2 kHzKiloHertz (kHz) 10^3 Hz Worldwide GW.jpg
Golay Paging (GSC) Golay Paging (or Golay Sequential Code, GSC) is a one-way 2-FSKFrequency-Shift Keying paging format developed by Motorola. It is capable of transmitting tone, numeric, alphanumeric, and voice pages. 33 MHzMegaHertz (MHz) 10^6 Hz — 932 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying 2.6 kHzKiloHertz (kHz) 10^3 Hz Worldwide Golay.jpg
Graw DFM-06 Weather Balloon (Radiosonde) The DFM-06 is a standard radiosonde for most applications. It is perfectly suited for synoptic observations or military applications. 400.01 MHzMegaHertz (MHz) 10^6 Hz — 405.99 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying Europe Graw.jpg
HC-265 Voice Scrambler HC-265 is a Voice Scrambling mode developed by Hagelin Crypto for their HC-265 CRYPTOCOM secure voice unit. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 2.25 kHzKiloHertz (kHz) 10^3 Hz — 3 kHzKiloHertz (kHz) 10^3 Hz Worldwide HC 265.jpg
HC-ARQ Haegelin Crypto ARQAutomatic Repeat reQuestAutomatic Repeat Query (HC-ARQAutomatic Repeat reQuestAutomatic Repeat Query) was an FSKFrequency-Shift Keying synchronous simplex ARQAutomatic Repeat reQuestAutomatic Repeat Query system used by the UN and International Rescue Committee. This mode has been phased out and is no longer in use. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide HC-ARQ.jpg
HD Radio (AM) HD Radio is a proprietary digital broadcast radio format transmitted in North America, usually as sidebands on analog carriers. This is the AMAmplitude Modulation band implementation of HD Radio. 535 kHzKiloHertz (kHz) 10^3 Hz — 1.7 MHzMegaHertz (MHz) 10^6 Hz RAW OFDMOrthogonal Frequency-Division Multiplexing 30 kHzKiloHertz (kHz) 10^3 Hz North America Hd radio am.jpg
HD Radio (FM) HD Radio is a proprietary digital broadcast radio format transmitted in North America, usually as sidebands on analog carriers. This is the FMFrequency Modulation band implementation of HD Radio. 87.7 MHzMegaHertz (MHz) 10^6 Hz — 107.9 MHzMegaHertz (MHz) 10^6 Hz RAW OFDMOrthogonal Frequency-Division Multiplexing 400 kHzKiloHertz (kHz) 10^3 Hz North America HD Radio fm broadcast.jpg
HFGCS (High Frequency Global Communications System) HFGCS is a series of networks deployed by the United States Air Force to send encoded messages to deployed aircraft. This network is well known for it's coded EAM's (Emergency Action Messages) used for coordinating United States Strategic Nuclear Forces. 4.724 MHzMegaHertz (MHz) 10^6 Hz — 15.016 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) 2.95 kHzKiloHertz (kHz) 10^3 Hz Worldwide 11175 KHZ Crop Waterfall.png
HNG-FEC HNG-FECForward Error Correction was a full duplex system developed and used solely by the Ministry of Foreign Affairs in Hungary. Used 100.05 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. with 500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift FSKFrequency-Shift Keying. This mode is no longer used today. 2.4 MHzMegaHertz (MHz) 10^6 Hz — 24 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Hungary HNG FEC.jpg
HORYU-4 Telemetry 437.375 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) BPSKBinary Phase-Shift Keying (1 bit per symbol) Worldwide HORYU-4 Telemetry Waterfall.jpg
Hellschreiber Hellschreiber (Also known as Feld Hell or just Hell) is a teleprinter system developed in the late 1920's by Rudolf Hell, a German inventor. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) OOKOn-Off Keying Modulation, FSKFrequency-Shift Keying, MSKMinimum-Shift Keying (When Shift/Bd = 0.5. It is impossible to get this ratio to be lower than 0.5, hence it is called the 'Minimum' shift.) 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 800 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Feld Hellthmb.jpg
High Frequency Active Auroral Research Program (HAARP) HAARP is a ionospheric research program conducted at the HAARP Research Station at Gakona, Alaska. As of 2014 the HAARP program was shut down and the facility was given to The University of Alaska Fairbanks. The university plans on reopening HAARP in early 2017. 2.7 MHzMegaHertz (MHz) 10^6 Hz — 10 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation / CWContinuous Wave CWContinuous Wave 100 kHzKiloHertz (kHz) 10^3 Hz United States Haarp.jpg
High Frequency Data Link (HFDL) HFDL, also known as HFHigh Frequency (3-30 MHz)-ACARS, ARINC 753, ARINC 635, and HFHigh Frequency (3-30 MHz) DATALINK,is a data link that aircraft use to communicate short messages over long distances using HFHigh Frequency (3-30 MHz) signals. 2.9 MHzMegaHertz (MHz) 10^6 Hz — 22 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.4 kHzKiloHertz (kHz) 10^3 Hz Worldwide HFDL.jpg
High Frequency Data and Voice Link (HFDVL) HFDVL (or HFD+VL) is an experimental mode developed by research groups from The University of Las Palmas de Gran Canaria and The Polytechnic University of Madrid. This mode is intended for military use in accordance with STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 5066 parameters. 14.35 MHzMegaHertz (MHz) 10^6 Hz — 14.829 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing, QAMQuadrature Amplitude Modulation kHzKiloHertz (kHz) 10^3 Hz Spain HFDVL.jpg
High Speed USB Noise High Speed USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) 2.0 clock noise. Shows up at multiples of 480 MHzMegaHertz (MHz) 10^6 Hz. 480 MHzMegaHertz (MHz) 10^6 Hz — 960 MHzMegaHertz (MHz) 10^6 Hz RAW 200 kHzKiloHertz (kHz) 10^3 Hz Worldwide USB noise.png
HyperFix HyperFix was a radio-navigation system developed by Racal. Was used by vessels and ships. Has largely been phased out in favor of Differential GPS. 1.6 MHzMegaHertz (MHz) 10^6 Hz — 3.4 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Hyperfix.jpg
ICAO Selcal ICAO Selcal (also known as AVCALL, ANNEX 10, or just SELCAL) is a HFHigh Frequency (3-30 MHz)/VHFVery High Frequency (30-300 MHz) aviation selective calling system used by ground stations to initiate radio communications with aircraft. MHzMegaHertz (MHz) 10^6 Hz — 300 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 1.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide ICAO Selcall sample.jpg
ILS Marker Beacon ILS Marker Beacons are used by aircraft for Instrument Landing Systems, transmitted by an upward-facing directive antenna at known distances along the approach path. 75 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation OOKOn-Off Keying Modulation kHzKiloHertz (kHz) 10^3 Hz Worldwide 800px-LOM Waterfallthmb.png
IRA-ARQ IRA-ARQAutomatic Repeat reQuestAutomatic Repeat Query, also known as BULG-ASCII and ASCII-ARQAutomatic Repeat reQuestAutomatic Repeat Query, is a high data rate ARQAutomatic Repeat reQuestAutomatic Repeat Query FSKFrequency-Shift Keying system used by Bulgarian, Slovakian, and Czech diplomatic stations. The maximum speed of this mode has been seen to reach 1200 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. Not seen much much nowadays MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 650 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 1.35 kHzKiloHertz (kHz) 10^3 Hz Worldwide IRA-ARQ 300bd 500hz.jpg
ISCAT Ionospheric Scattering (ISCAT) mode used for weak signal long distance radio contact by meteor and Ionosphere scattering. 50 MHzMegaHertz (MHz) 10^6 Hz — 148 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 904 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 1.809 kHzKiloHertz (kHz) 10^3 Hz Worldwide ISCAT-A Sim.jpg
ISM Band Weather sensor Data returned from a consumer weather sensor using the AlectoV1 protocol. 433 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation 4.4 kHzKiloHertz (kHz) 10^3 Hz Worldwide Alecto wxthmb.png
ISM Band device An ISM band device such as a power meter or a wireless doorbell. 315 MHzMegaHertz (MHz) 10^6 Hz — 920 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation, NFMNarrowband Frequency Modulation ASKAmplitude-Shift Keying, OOKOn-Off Keying Modulation, FSKFrequency-Shift Keying 20 kHzKiloHertz (kHz) 10^3 Hz Worldwide ISMBandPowerMeter Waterfallthmb.jpg
Improved Automatic Link Set-up (ALIS-2) ALIS-2, also known as RS-ARQAutomatic Repeat reQuestAutomatic Repeat Query, RS ARQAutomatic Repeat reQuestAutomatic Repeat Query 240, and MERLIN, is an improvement of the original ALIS system. ALIS-2 is used in the Rohde & Schwarz MERLIN modem. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide ALIS 2.jpg
Inmarsat Aero Inmarsat Aero is the protocol that's used to link ground stations with aircraft via Inmarsat's satellite link. This protocol carries digital voice, fax and low speed data such as ACARS and ADS-C. 1,545 MHzMegaHertz (MHz) 10^6 Hz — 3,687 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 800 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 10.5 MHzMegaHertz (MHz) 10^6 Hz Worldwide Inmarsat Aero.jpg
Inmarsat-C TDM Inmarsat C provides two-way data and messaging communication services to and from virtually anywhere in the world. The low-cost terminals and antennas are small enough to be fitted to any size of ship. 1,537.7 MHzMegaHertz (MHz) 10^6 Hz — 1,539.685 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide Inmarsat TDM NCS.jpg
Inmarsat-D+ Downlink Inmarsat D+ (and it's predecessor, Inmarsat D) is Inmarsat's satellite paging system. The main use of this technology nowadays is in tracking trucks and buoys and SCADA applications. 1,525 MHzMegaHertz (MHz) 10^6 Hz — 1,559 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 512 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Inmarsat-D.jpg
Integrated Digital Enhanced Network (iDEN) iDEN is a TDMATime Division Multiple Access-based digital wireless standard developed by Motorola. It is a type of trunked radio with cellular phone benefits. 806 MHzMegaHertz (MHz) 10^6 Hz — 869 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation QAMQuadrature Amplitude Modulation, TDMATime Division Multiple Access 18.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide IDEN image.jpg
Integrated Services Digital Broadcasting—Terrestrial (ISDB-T) ISDB-T (Integrated Services Digital Broadcasting – Terrestrial) is a new type of digital broadcasting system for providing audio, video and multimedia services. ISDB-T system was standardized at the Association of Radio Industries and Businesses (ARIB) in Japan. ISDB-T uses a modulation method referred to as Band Segmented Transmission (BST) OFDMOrthogonal Frequency-Division Multiplexing. 470 MHzMegaHertz (MHz) 10^6 Hz — 770 MHzMegaHertz (MHz) 10^6 Hz RAW QPSKQuadrature Phase-Shift Keying (2 bits per symbol), 64-QAMQuadrature Amplitude Modulation MHzMegaHertz (MHz) 10^6 Hz Worldwide
Ionosonde An Ionosonde (Also known as a chirpsounder or ionospheric sounder) is a radar that examines the Ionosphere and monitors HFHigh Frequency (3-30 MHz) propagation conditions by sweeping the HFHigh Frequency (3-30 MHz) band and receiving the echoes. MHzMegaHertz (MHz) 10^6 Hz — 40 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FMCW HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Ionosonde2e.png
Iranian Navy QPSK Modem Iranian Navy QPSKQuadrature Phase-Shift Keying (2 bits per symbol) Modem is a QPSKQuadrature Phase-Shift Keying (2 bits per symbol) mode used by the Iranian Navy. It has gone through several versions. The current version (2015) is V2 and supports speeds of 468 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., 936 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., and 1872 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. 8.046 MHzMegaHertz (MHz) 10^6 Hz — 17.382 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2.85 kHzKiloHertz (kHz) 10^3 Hz Iran Iranian Navy QPSK 468.jpg
Iridium This is the L-band uplink/downlink for the Low Earth Orbit Iridium Satellite Constellation. This system is used for satellite based phone calls. 1,616 MHzMegaHertz (MHz) 10^6 Hz — 1,626.5 MHzMegaHertz (MHz) 10^6 Hz RAW PSKPhase-Shift Keying 31.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide IridiumTDMA.png
Israeli Intelligence VFT Israeli Intelligence based FSKFrequency-Shift Keying VFTVoice Frequency Telegraphy. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 3.1 kHzKiloHertz (kHz) 10^3 Hz Israel Israeli Intel VFT.jpg
Israeli Navy Hybrid Modem (188-110 MOD) The Israeli Naval Hybrid Modem is based on the MIL-STD-188-110 Serial Standard. Has characteristic preamble with 4/6 Tone and 18 QPSKQuadrature Phase-Shift Keying (2 bits per symbol) parallel mode before 110 Serial transmission. Possible use as a broadcast transmitter for ships. Used by the Israeli Navy 4XZ station from Haifa. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.75 kHzKiloHertz (kHz) 10^3 Hz Israel Mil Mod Israeli.jpg
Israeli VFT Israeli based VFTVoice Frequency Telegraphy transmission, most likely used by Israeli government or military. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying, PSKPhase-Shift Keying 3.1 kHzKiloHertz (kHz) 10^3 Hz Israel Preamble.jpg
JJY JJY, also known as JJY-40 and JJY-60, is the call sign for a pair of longwave Time Signal stations in Japan. 40 kHzKiloHertz (kHz) 10^3 Hz — 60 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) AMAmplitude Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Japan JJY.png
JT65 JT65 is an amateur radio QSO communication protocol developed by Joe Taylor, K1JT. JT65 has 3 submodes: JT65A, JT65B, and JT65C. The most popular submode of JT65 is JT65A. JT65 gets '65' from the 65 tones it uses. 1.838 MHzMegaHertz (MHz) 10^6 Hz — 50.276 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 180 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 710 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide JT65AWaterfall.png
JT6M JT6M is part of the WSJT suite of digital weak signal software applications developed by Joe Taylor, K1JT 50.215 MHzMegaHertz (MHz) 10^6 Hz — 50.25 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide JT6M sim.jpg
JT9 JT9 is a very narrow 9-FSKFrequency-Shift Keying mode for making contact (QSO's) under extreme weak-signal conditions. 3.578 MHzMegaHertz (MHz) 10^6 Hz — 28.079 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 20 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide JT9.png
JTMS JTMS is a meteor scatter mode that uses MSKMinimum-Shift Keying (When Shift/Bd = 0.5. It is impossible to get this ratio to be lower than 0.5, hence it is called the 'Minimum' shift.). JTMS behaves similarily to FSK441. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MSKMinimum-Shift Keying (When Shift/Bd = 0.5. It is impossible to get this ratio to be lower than 0.5, hence it is called the 'Minimum' shift.) 1.7 kHzKiloHertz (kHz) 10^3 Hz Worldwide JTMS sim.jpg
Japan Military 8-Channel FSK Data signal thought to originate from Japanese Military/Navy 12.385 MHzMegaHertz (MHz) 10^6 Hz — 16.554 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 2.4 kHzKiloHertz (kHz) 10^3 Hz Japan Japan 8 2-fsk.jpg
Japanese Slot Machine (XSL) The Japanese Slot Machine (Enigma Designation XSL) is a simplex system used by the Japanese Maritime Self-Defense Force in Ichihara, Japan. 4.153 MHzMegaHertz (MHz) 10^6 Hz — 8.703 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Japan XSL idle.jpg
Jindalee Operational Radar Network (JORN) JORN is an Australian OTHR system that operates uniquely in that it's radar bursts include an intro tone before the burst. 10.153 MHzMegaHertz (MHz) 10^6 Hz — 22.95 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FMCW 10 kHzKiloHertz (kHz) 10^3 Hz Australia JORN.png
KG-STV KG-STV is an image transmission mode developed by JJ0OBZ in Japan. 3.733 MHzMegaHertz (MHz) 10^6 Hz — 14.233 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide KG-STV 4LFSK norm.jpg
Kiwi Kiwi is a telemetry mode developed by CNES used on amateur rockets and radio balloons in France. 137.95 MHzMegaHertz (MHz) 10^6 Hz — 138.5 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying 12.5 kHzKiloHertz (kHz) 10^3 Hz France Kiwi thumb.jpg
LORAN LORAN (short for LOng RAnge Navigation) is a hyperbolic radio navigation system. 100 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PPMPulse Position Modulation 20 kHzKiloHertz (kHz) 10^3 Hz Worldwide LORAN.png
LTE Uplink Acquired via telecommunications carrier hardware during interference investigation of an Australian cellular network. 700 MHzMegaHertz (MHz) 10^6 Hz — 2,600 MHzMegaHertz (MHz) 10^6 Hz SC-FDMAFrequency Division Multiple Access QPSKQuadrature Phase-Shift Keying (2 bits per symbol) MHzMegaHertz (MHz) 10^6 Hz Worldwide LTE Uplink.PNG
Lentus Lentus is an extremely slow QRPIn amateur radio, QRP operation refers to transmitting at reduced power while attempting to maximize one's effective range. mode developed by Patrick Lindecker F6CTE used to transmit QRPIn amateur radio, QRP operation refers to transmitting at reduced power while attempting to maximize one's effective range.'s at very low power. Each 43-character (75 bit) transmission takes roughly 5 minutes to transmit across 32 possible tones in a tight 25 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). bandwidth. 136.3 kHzKiloHertz (kHz) 10^3 Hz — 14.096 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 25 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Lentus.png
Lightning Sferics VLFVery Low Frequency (3-30 kHz) RFRadio Frequency emissions from lightning in the atmosphere that can affect up to HFHigh Frequency (3-30 MHz) frequencies and beyond depending on strength. Has a popping crackle sound with both USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) and AMAmplitude Modulation modes of reception. HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 30 MHzMegaHertz (MHz) 10^6 Hz Worldwide Lightening Sfpherics.png
Link-11 Link-11 (Also known as ALLIGATOR, STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 5511, TADIL-A, MIL-STD-6011, and MIL-STD-188-203-1A) is a Tactical Data Link standard (formerly known as Tactical Digital Information Link (TADIL) used by NATONorth Atlantic Treaty Organization and the US Military for Maritime Tactical Data Exchange. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.5 kHzKiloHertz (kHz) 10^3 Hz — 6 kHzKiloHertz (kHz) 10^3 Hz Worldwide Link-11Waterfall.png
Link-11 (UHF) This is the UHFUltra High Frequency (300-3000 MHz) band variant of Link-11, which is transmitted on a FMFrequency Modulation carrier. The FMFrequency Modulation-demodulated baseband is identical to the HFHigh Frequency (3-30 MHz) Link-11 waveform. 225 MHzMegaHertz (MHz) 10^6 Hz — 399.975 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying 30 kHzKiloHertz (kHz) 10^3 Hz Worldwide Link-11 UHF.jpg
LoJack LoJack is a vehicle tracking system that allows vehicles to be tracked by police, with the aim of recovering them in case of theft via a small radio transceiver clandestinely installed in a vehicle. 173.075 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation GMSKGaussian Minimum-Shift Keying 10 kHzKiloHertz (kHz) 10^3 Hz Worldwide Lojack.jpg
Logic Trunked Radio Control Control channel for a logic trunked radio system. 148 MHzMegaHertz (MHz) 10^6 Hz — 170 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 12 kHzKiloHertz (kHz) 10^3 Hz Worldwide LogicTrunkedRadio Waterfallthmb.jpg
Low Rate Picture Transmission (LRPT) The Low Rate Picture Transmission (LRPT) is a digital transmission system, commonly transmitted by METEOR-M satellites, used to deliver weather images and data. 137 MHzMegaHertz (MHz) 10^6 Hz — 138 MHzMegaHertz (MHz) 10^6 Hz RAW QPSKQuadrature Phase-Shift Keying (2 bits per symbol) 120 kHzKiloHertz (kHz) 10^3 Hz Worldwide LRPTWaterfall.jpg
MD-522 MD-522 (Also known as MIL-M-55529A) is a synchronous FSKFrequency-Shift Keying mode built into GRC-MD522 teletypewriter sets and used for wirelessly transmitting ASCII information. MD-522 has a narrowband, wideband, and diversity mode. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). United States MD-674.png
MD-674 MD-674, also known as Wireline FSKFrequency-Shift Keying, is a very old United States Military FSKFrequency-Shift Keying Modem from the 1960's. Uses 85 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). FSKFrequency-Shift Keying shift. Speeds of 50 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., 75 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., 100 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., and 150 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. have been logged. No longer seen today. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). United States MD-674.png
METOP-A METOP-A Satellite DCP control signal 465.99 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 54 kHzKiloHertz (kHz) 10^3 Hz Worldwide KMS4-Waterfall.jpg
MIL-STD-110-342 MIL-STD-110-342 was a US Dept. of Defense standard for a 16 channel VFTVoice Frequency Telegraphy teletype transmission. This mode was officially cancelled as of December 5th, 1995. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 3.1 kHzKiloHertz (kHz) 10^3 Hz Worldwide MIL-STD-110-342.jpg
MIL-STD-188-110 Appendix A 16-Tone MIL-STD-188-110 Appendix A is a 16-tone OFDMOrthogonal Frequency-Division Multiplexing PSKPhase-Shift Keying signal used to transmit data. As of 110C revision, this mode has been phased out. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 2.1 kHzKiloHertz (kHz) 10^3 Hz Worldwide App A 16-tone.jpg
MIL-STD-188-110 Appendix B 39-Tone MIL-STD-188-110 Appendix B is a 39-tone OFDMOrthogonal Frequency-Division Multiplexing DQPSKDifferential Quadrature Phase-Shift Keying mode used to send data and voice. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 2.4 kHzKiloHertz (kHz) 10^3 Hz Worldwide 188-110 App B.jpg
MIL-STD-188-110 Serial MIL-STD-188-110 Serial is a US Department of Defense standard for HFHigh Frequency (3-30 MHz) Communications, Serial PSKPhase-Shift Keying mode. Can transmit both data and voice with a range of interleaving and speed modes for optimal propagation. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.75 kHzKiloHertz (kHz) 10^3 Hz Worldwide MIL STD 188-110ABC.jpg
MMP-4800 MMP-4800 was a MDTMobile Data Terminal, A mobile data terminal (MDT) is a computerized device used in public transit vehicles, taxicabs, commercial trucking fleets, military logistics, and emergency vehicles, such as police cars, to communicate with a central dispatch office. (Mobile Data Terminal) protocol developed by Canadian company Mobile Data International (MDI) in 1982 for their Mobile Data Terminals. Used by public safety and commercial industries. Phased out. 150 MHzMegaHertz (MHz) 10^6 Hz — 900 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 12.5 kHzKiloHertz (kHz) 10^3 Hz — 25 kHzKiloHertz (kHz) 10^3 Hz Worldwide NoWaterfallFiller.png
MOBITEX MOBITEX is an OSI based open standard, national public access wireless packet-switched data network. 400 MHzMegaHertz (MHz) 10^6 Hz — 900 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation GMSKGaussian Minimum-Shift Keying, FFSKFast Frequency-Shift Keying 15 kHzKiloHertz (kHz) 10^3 Hz Worldwide Mobitex8000.jpg
MODAT MODAT is a 7-tone Automatic Number Identification (ANI) status system used by handheld radios. It provides unit ID and emergency statuses to receiving radio sets when transmitted. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide MODAT.png
MPT 1327 MPT1327 (Ministry of Posts and Telegraph 1327) is a signaling protocol standard for analog trunked radio 162.5 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FFSKFast Frequency-Shift Keying 10 kHzKiloHertz (kHz) 10^3 Hz — 25 kHzKiloHertz (kHz) 10^3 Hz Worldwide MPT1327.jpg
MSM-1250 Modem MSM-1250 (Medium Speed Modem) is a 10 FSKFrequency-Shift Keying-2 OFDMOrthogonal Frequency-Division Multiplexing digital data protocol used by the stand-alone modem "SkyFax", used to transmit and receive faxes on HFHigh Frequency (3-30 MHz). MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 2.4 kHzKiloHertz (kHz) 10^3 Hz — 2.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide MSM-1250.jpg
MT63 MT63 is a Orthogonal Frequency Division Multiplexed (OFDMOrthogonal Frequency-Division Multiplexing) digital data mode aimed for use in high noise environments. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) OFDMOrthogonal Frequency-Division Multiplexing, PSKPhase-Shift Keying 500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2 kHzKiloHertz (kHz) 10^3 Hz Worldwide MT63.jpg
Marconi Selenia 25-Tone Modem The Marconi Selenia 25-Tone Modem is a military modem developed sometime around 2003 by Marconi Selenia Communications (Now Finmeccanica). It supports ECCMElectronic Counter-CounterMeasures (ECCM) is a part of electronic warfare which includes a variety of practices which attempt to reduce or eliminate the effect of electronic countermeasures (ECM) such as jamming. ECCM is also known as electronic protective measures (EPM), chiefly in Europe. capability and transmits at a datarate of 2400bps. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 1.6 kHzKiloHertz (kHz) 10^3 Hz Worldwide Marconi25.jpg
Mazielka (X06) Mazielka (X06) is a diplomatic selcall system used by the Russian Ministry of Foreign Affairs. Used to alert that a Serdolik transmission is going to occur soon, usually on a different frequency. 4.963 MHzMegaHertz (MHz) 10^6 Hz — 23.458 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia X06.jpg
Meteosat WEFAX Meteosat WEFAX is a WEFAX used to transmit satellite images via Meteosat Satellites. WEFAX was introduced with the first Meteosat in 1977. 1,691 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation AMAmplitude Modulation, FMFrequency Modulation Worldwide
Modernised High Frequency Communications System (MHFCS) The Modernised High Frequency Communications System (MHFCS) is an Australian Department of Defense HFHigh Frequency (3-30 MHz) System for their military communications network. Also known as AUS MIL ISBIndependent Side Band Modulation Modem, AUS MHFCS, and ADF HFCS. 2.01 MHzMegaHertz (MHz) 10^6 Hz — 27.478 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 750 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Australia ISB AUS MIL.jpg
Morse Code (CW) CWContinuous Wave Morse Code is the simplest form of transmission found virtually all over the RFRadio Frequency bands for a variety of uses. The most common use of this is for Call-sign Beacons by both Amateur and Military operators. MHzMegaHertz (MHz) 10^6 Hz — 930 MHzMegaHertz (MHz) 10^6 Hz CWContinuous Wave OOKOn-Off Keying Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide CW.jpg
Motorola Type II Radio trunking control channel. 800 MHzMegaHertz (MHz) 10^6 Hz — 960 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz Worldwide Moto.jpg
Multi Frequency Shift Keying (MFSK) MFSKMultiple Frequency Shift-Keying is a family of multi-frequency shift keying digital transmission modes. MFSKMultiple Frequency Shift-Keying-8 and MFSKMultiple Frequency Shift-Keying-16 are two well-known amateur radio modes. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 154 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 630 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide MFSK 8 thmb.jpg
Multitone Paging Multitone Paging signal, developed by Multitone Electronics in the UK. Uses similar coding to POCSAG but the headers are different and only work with Multitone's range of paging products 25 MHzMegaHertz (MHz) 10^6 Hz — 470 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FFSKFast Frequency-Shift Keying 12.5 kHzKiloHertz (kHz) 10^3 Hz — 25 kHzKiloHertz (kHz) 10^3 Hz Worldwide Multitone Pager.jpg
NATEL NATEL is a 5-tone selcall mode defined by Scandinavian National Telephone recommendations. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide Natel 5-tone.png
NFM Voice Used in analog walkie-talkies and communication systems. 27 MHzMegaHertz (MHz) 10^6 Hz — 864 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FMFrequency Modulation kHzKiloHertz (kHz) 10^3 Hz — 30 kHzKiloHertz (kHz) 10^3 Hz Worldwide NFMvoice.jpg
NTSC Broadcast National Television System Committee (NTSC) Television broadcast is an analogue television broadcast mode. Currently being phased out in parts of the world in favor of digital broadcast. 54 MHzMegaHertz (MHz) 10^6 Hz — 806 MHzMegaHertz (MHz) 10^6 Hz RAW QAMQuadrature Amplitude Modulation, VSBVestigial Sideband Modulation MHzMegaHertz (MHz) 10^6 Hz Worldwide No Audio File NTSC.jpg
Next Generation Digital Narrowband (NXDN) NXDN is a digital narrowband trunked radio protocol developed by ICOM Inc. and JVC KENVOOD Co. The NXDN protocol is used for commercial Private Land Mobile Radio (PLMR) and low-end public safety communications systems. 136 MHzMegaHertz (MHz) 10^6 Hz — 520 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation C4FMContinuous 4-Level Frequency Modulation 6.25 kHzKiloHertz (kHz) 10^3 Hz — 12.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide NXDN.jpg
Nissan Car Key Wireless entry rolling code car key. 301.5 MHzMegaHertz (MHz) 10^6 Hz — 433 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation 40 kHzKiloHertz (kHz) 10^3 Hz Worldwide NissanCarFob Waterfallthmb.png
Nokia Adaptive Message Terminal The Nokia Adaptive Message Terminal, also known as Nokia Adaptive Burst Modem, is a Finnish encrypted messaging system suggested to be used by Finnish Intelligence Services. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz kHzKiloHertz (kHz) 10^3 Hz — 1.6 kHzKiloHertz (kHz) 10^3 Hz 300 Bd semiidle stanag 4202.jpg
Non-Directional Beacon (NDB) A Non-Directional Beacon (NDB) is a ground-based, low frequency radio transmitter used as an instrument approach for airports and offshore platforms. 190 kHzKiloHertz (kHz) 10^3 Hz — 1.8 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) OOKOn-Off Keying Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide NDB.jpg
Nordic Mobile Telephone (NMT) Nordic Mobile Telephone (NMT, NMT-450, and NMT-900) is a first generation analog cell phone system. Originally designed for and by Nordic countries (Finland, Sweden, Norway, Denmark) it was widely deployed around the world. Nowadays (as of 2015) NMT is defunct. 450 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying 25 kHzKiloHertz (kHz) 10^3 Hz Worldwide NMT.jpg
North Korean Diplo FSK North Korean Diplomatic FSKFrequency-Shift Keying link, teletype radio diplomatic usage. Also known as DPRK-FSKFrequency-Shift Keying, KRE-FSKFrequency-Shift Keying, DPRK-ARQAutomatic Repeat reQuestAutomatic Repeat Query, and KEGURI. Has a FECForward Error Correction stream mode and a burst ARQAutomatic Repeat reQuestAutomatic Repeat Query mode. MHzMegaHertz (MHz) 10^6 Hz — 29 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 1.2 kHzKiloHertz (kHz) 10^3 Hz — 1.4 kHzKiloHertz (kHz) 10^3 Hz North Korea DPRK ARQ.jpg
North Korean Diplo PSK North Korean Diplomatic PSKPhase-Shift Keying link. Also known as KRE-PSKPhase-Shift Keying. Four speed modes have been seen, 150 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., 300 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., 600 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., and 1200 bdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. All use BPSKBinary Phase-Shift Keying (1 bit per symbol) modulation. The main identifying feature of this signal are the preambles and end of transmission patterns. MHzMegaHertz (MHz) 10^6 Hz — 29 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2.4 kHzKiloHertz (kHz) 10^3 Hz North Korea DPRK 1200bd.jpg
OPERA Beacon / Data OPERA Ad-Hoc Data/Beacon 136 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) ASKAmplitude-Shift Keying HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). World Wide Op02.png
Olivia OLIVIA is an amateur digital teletype mode designed by Pawel Jalocha SP9VRC in 2005. It's goal was to be effective even in poor propagation conditions. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 125 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2 kHzKiloHertz (kHz) 10^3 Hz Worldwide Olivia 8-250y.png
Orbcomm Orbcomm satellites are used for monitoring and sending short text messages. 137 MHzMegaHertz (MHz) 10^6 Hz — 150 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying 15 kHzKiloHertz (kHz) 10^3 Hz Worldwide ORBCOMM.jpg
PACKET PACKET, also known as FSK300, AX25, and X25, is a packet based protocol derived from AX.25 and HDLC computer network protocols. Packet radio is a synchronous system in which data is transmitted in ASCII character packets. MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 730 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide PACKET 300.jpg
PACTOR I PACTOR-I is a digital data protocol combining elements of PACKET and AMTOR ARQAutomatic Repeat reQuestAutomatic Repeat Query. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide PACTOR Addimg.jpg
PACTOR II PACTOR II is an advancement of PACTOR I. It is up to 8 times faster than PACTOR I. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 450 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide PACTOR IIstd.jpg
PACTOR III PACTOR III introduces 6 speed levels that provide higher throughput and improved robustness compared to PACTOR I and II. PACTOR III is on average 3.5 times faster than PACTOR II. With optimal conditions, PACTOR III becomes over 5 times faster. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2.4 kHzKiloHertz (kHz) 10^3 Hz Worldwide PACTORIIIthumb.jpg
PACTOR IV PACTOR IV is the newest iteration of the PACTOR series, advancing from PACTOR I-III. It is 1.5x-3x faster than PACTOR III, and has 10 speed levels. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, QAMQuadrature Amplitude Modulation 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2.4 kHzKiloHertz (kHz) 10^3 Hz Worldwide PACTOR IV.jpg
PAL Broadcast Phase Alternating Line (PAL) Analogue Television Broadcast. Now phased out in most of the world. 47 MHzMegaHertz (MHz) 10^6 Hz — 862 MHzMegaHertz (MHz) 10^6 Hz RAW QAMQuadrature Amplitude Modulation, VSBVestigial Sideband Modulation MHzMegaHertz (MHz) 10^6 Hz — 8 MHzMegaHertz (MHz) 10^6 Hz Worldwide 800px-PALTV Waterfallthmb.jpg
PAX PAX and PAX2 are developed by Patrick Lindecker F6CTE in 2005, and was derived from Olivia. It utilizes the AX.25 protocol that PACKET uses, and had a minimum SNR of -10dB. Can transmit APRSAutomatic Packet Reporting System, an amateur radio-based system for real time tactical digital communications of information of immediate value in the local area frames. 3.59 MHzMegaHertz (MHz) 10^6 Hz — 144.62 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide PAX.jpg
PLUTO II OTH Radar PLUTO II is an Over The Horizon Radar based at the UK's RAF Akrotiri base in Cyprus. PLUTO II is very active in Europe. MHzMegaHertz (MHz) 10^6 Hz — 38 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FMCW 20 kHzKiloHertz (kHz) 10^3 Hz Cyprus PLUTO II.png
POCSAG POCSAG (Post Office Code Standardisation Advisory Group), also known as Super-POCSAG, Radio Paging Code No. 1 or RPC1, is a one-way 2FSK paging protocol that supports 512, 1200, and 2400 bpsBits per second (bps). 25 MHzMegaHertz (MHz) 10^6 Hz — 932 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide POCSAG Waterfallthmb.png
POL-ARQ POL-ARQAutomatic Repeat reQuestAutomatic Repeat Query was a duplex ARQAutomatic Repeat reQuestAutomatic Repeat Query system used by Polish and Italian diplomatic services. This system uses the CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) 476-4 alphabet with polatiry retained. No longer in use. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Europe POL-ARQ.png
PRC-16 PRC-16 is a Chinese sourced PSKPhase-Shift Keying data link, traced to Shanghai. Suspected user Chinese Military. 14.3 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 2.2 kHzKiloHertz (kHz) 10^3 Hz China PRC-16.jpg
PSK-AM PSKPhase-Shift Keying-AMAmplitude Modulation is an amateur digital mode developed by Patrick Lindecker F6CTE in 2002/2003, and incorporates FECForward Error Correction interleaving. PSKPhase-Shift Keying-AMAmplitude Modulation uses the modulation of PSK10/31 with the FECForward Error Correction of SITOR-B. 10.148 MHzMegaHertz (MHz) 10^6 Hz — 144.62 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 40 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 180 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide PSKAM-31.png
PSK2K PSK2K is a meteor scatter type of mode written by DJ5HG Using a modulation scheme of BPSKBinary Phase-Shift Keying (1 bit per symbol) at 2000 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. 50.36 MHzMegaHertz (MHz) 10^6 Hz — 144.36 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide PSK2K.jpg
Panther-H Modem Panther-H is an intelligent frequency hopping transceiver developed by Racal (now Thales Group). Has a signature 8-burst SOC (Start Of Conversation) sync procedure. Used in Panther-2000H radios 1.5 MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide Panther-H SOC.png
Phase Shift Keying (PSK) PSKPhase-Shift Keying is a digital teletype mode based on Phase-Shift Keying (PSKPhase-Shift Keying) modulation. The most popular amateur radio PSKPhase-Shift Keying mode is PSKPhase-Shift Keying 31. 1.838 MHzMegaHertz (MHz) 10^6 Hz — 909 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 10 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 1 kHzKiloHertz (kHz) 10^3 Hz Worldwide BPSKthumb.png
Piccolo Piccolo was a MFSKMultiple Frequency Shift-Keying system developed by the UK Foreign and Commonwealth Office (FCO) to communicate with foreign embassies and UK military stations around the world. No longer used. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 180 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Piccolo Mk12.png
Police Idling Walkie Talkie Radio Signal I found out what Unknown 453 was, the one that I posted a few weeks ago, it is a police idling signal, apparently the police signal belongs to the remote SDR I was listening to, but I got my own SDR now. So yeah, it is an idling signal for a police walkie-talkie 453.6 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Police idlingthmb.jpg
Polish Intelligence 100bd/625Hz FSK One-way broadcast system, used by one of Polish intelligence agencies for delivery of messages to their operatives abroad on fixed schedules. MHzMegaHertz (MHz) 10^6 Hz — 20 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 3.5 kHzKiloHertz (kHz) 10^3 Hz Poland F11.png
Portable Traffic Lights Signals sent from portable traffic lights that are often used at roadworks. 154.463 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide PortTrafLight Waterfall.png
Positive Train Control (PTC) Positive train control (PTC) is a system of functional requirements for monitoring and controlling train movements as an attempt to provide increased safety. 220 MHzMegaHertz (MHz) 10^6 Hz RAW 20 kHzKiloHertz (kHz) 10^3 Hz United States PTC.jpg
Primex Wireless Time Sync Primex Wireless Time Sync is a VHFVery High Frequency (30-300 MHz) Time Synchronization signal used in Primex Wireless's XR Series. 72.02 MHzMegaHertz (MHz) 10^6 Hz — 72.98 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide A112.jpg
Project 25 (P25) Project 25 (P25 or APCO-25) is a trunked radio standard developed by The Association of Public Safety Communications Officials International (APCO-25) for use with public safety organizations around the world. 136 MHzMegaHertz (MHz) 10^6 Hz — 860 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying, C4FMContinuous 4-Level Frequency Modulation 12.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide P25.jpg
Pulse Coded Modulated (PCM) RC Toy Signal used for remote control (RC) Toys. 27.145 MHzMegaHertz (MHz) 10^6 Hz — 49 MHzMegaHertz (MHz) 10^6 Hz PCM HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide PCMRCToy Waterfallwaterfall.png
Pursuit Wireless Car Key Pursuit series wireless car alarm entry key, for use on vehicles equipped with Pursuit Series Car Alarm System. 301.5 MHzMegaHertz (MHz) 10^6 Hz — 434 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation AMAmplitude Modulation 40 kHzKiloHertz (kHz) 10^3 Hz Worldwide 1995 nissan key.jpg
Q-MAC HF Modem The Q-MAC HFHigh Frequency (3-30 MHz) Modem is a military modem developed by Q-MAC (acquired by Barrett Communications). It uses OFDMOrthogonal Frequency-Division Multiplexing with a BPSKBinary Phase-Shift Keying (1 bit per symbol) sync channel in a gap of the signal. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing kHzKiloHertz (kHz) 10^3 Hz Worldwide QMAC.jpg
Q15X25 Q15X25, also known as NEWQPSK, is an experimental amateur radio packet modem developed by Pawel Jalocha SP9VRC. Q15X25 is a OFDMOrthogonal Frequency-Division Multiplexing QPSKQuadrature Phase-Shift Keying (2 bits per symbol) implementation of the AX.25 Packet protocol used in PACKET. 3.585 MHzMegaHertz (MHz) 10^6 Hz — 14.109 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 1.95 kHzKiloHertz (kHz) 10^3 Hz — 2.35 kHzKiloHertz (kHz) 10^3 Hz Worldwide Q15X25 2400.jpg
Quadcopter Telemetry Signal This signal originates from the Silicon Instruments Si1000 Software Defined Radio (SDR) that is a component of the 3DR Telemetry Radio, sold for use as a data link between a computer ground station and a UAV "a drone". 414 MHzMegaHertz (MHz) 10^6 Hz — 935 MHzMegaHertz (MHz) 10^6 Hz FHSS-TDM BPSKBinary Phase-Shift Keying (1 bit per symbol), 8-PSK8-Phase Phase-Shift Keying (3 bits per symbol), QAMQuadrature Amplitude Modulation Worldwide No Audio File Quadcopter.png
RAC-ARQ RAC-ARQAutomatic Repeat reQuestAutomatic Repeat Query, also known as MEROD and RACAL-ARQAutomatic Repeat reQuestAutomatic Repeat Query, is a teleprinter system by Racal, used in MEROD devices. MEROD stands for Message Entry and Read Out Device. Hasn't been seen since 2010. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz — 1.3 kHzKiloHertz (kHz) 10^3 Hz Worldwide RAC-ARQ.jpg
RBU RBU is a time code radio station located in Moscow. It transmits a continuous 10 kW time code on 66.66 kHzKiloHertz (kHz) 10^3 Hz. 66.66 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 650 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia RBU .jpg
ROS ROS is an amateur radio teletype free running QSO mode designed for low signal/high noise conditions. 1.8 MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) CDMACode Division Multiple Access, Phase Continious MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide ROS 8Bd.jpg
RTTYM RTTYM, developed by Nick Fedoseev (UT2UZ) in 2005, is a digital mode derived from Olivia. It aims to deliver a compromise of speed and performance. RTTYM is about 4x faster than Olivia, but trades the speed for reduced robustness and sensitivity. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 150 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 2 kHzKiloHertz (kHz) 10^3 Hz Worldwide RTTYM.png
RUM-FEC RUM-FECForward Error Correction, also known as ROU-FECForward Error Correction and SAU-FECForward Error Correction, is a FSKFrequency-Shift Keying FECForward Error Correction system used by Romanian diplomatic services. This is no longer used today, replaced by MIL-STD 188-110 Serial. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 750 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Romania RUM-FEC.jpg
RUM-MOI FEC RUM-MOI FECForward Error Correction, also known as RUM-MIL 115.76 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., is a FSKFrequency-Shift Keying FECForward Error Correction mode used by the Romanian Ministry of Internal Affairs, supposedly under military use. This is no longer used today, replaced by MIL-STD 188-110 Serial. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Romania ROU-MOI tfc.jpg
RWM RWM is a Russian shortwave time signal station. 4.996 MHzMegaHertz (MHz) 10^6 Hz — 14.996 MHzMegaHertz (MHz) 10^6 Hz CWContinuous Wave OOKOn-Off Keying Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia RWM.png
Radio Data System (RDS) Radio Data System (RDS) and it's North American variant, Radio Broadcast Data System (RBDS), are data modes transmitted on subcarriers of commercial FMFrequency Modulation radio station transmissions. 65 MHzMegaHertz (MHz) 10^6 Hz — 108 MHzMegaHertz (MHz) 10^6 Hz DSBDual Side Band Modulation PSKPhase-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide RBDS.png
Radio Teletype (RTTY) RTTYRadio TeleTYpe (Also known as Baudot or ITA2) uses the Baudot 5-bit alphabet with FSKFrequency-Shift Keying to send text messages over the shortwave. This mode is gradually dying out in favor of more robust modes like PSK31 in the amateur service. 147.3 kHzKiloHertz (kHz) 10^3 Hz — 28.15 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 85 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 850 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide RTTY thumbnail.jpg
ReFLEX ReFLEX is a two-way paging variant of FLEX. 896 MHzMegaHertz (MHz) 10^6 Hz — 941 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FFSKFast Frequency-Shift Keying 40 kHzKiloHertz (kHz) 10^3 Hz United States ReFLEX.jpg
Redundant Digital File Transfer (RDFT) RDFT is an amateur radio digital mode used to transmit files. 9.065 MHzMegaHertz (MHz) 10^6 Hz — 9.24 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 1.8 kHzKiloHertz (kHz) 10^3 Hz Worldwide Digtrx intro.jpg
Robust PACKET Robust PACKET, also known as HFHigh Frequency (3-30 MHz)-APRSAutomatic Packet Reporting System, an amateur radio-based system for real time tactical digital communications of information of immediate value in the local area, RPR, Winlink RMS, and APRSlink, is an OFDMOrthogonal Frequency-Division Multiplexing version of the amateur mode PACKET which is optimized for shortwave use. This mode was developed by Spezielle Communications Systeme GmbH & Co. KG (SCS). 3.61 MHzMegaHertz (MHz) 10^6 Hz — 14.103 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Robust PACKET.jpg
Russian Diplo VFT PSK 64Bd Russian Diplomatic 3 channel VFTVoice Frequency Telegraphy PSKPhase-Shift Keying running at 64 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. Enigma M42 designation 4.022 MHzMegaHertz (MHz) 10^6 Hz — 23.131 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.5 kHzKiloHertz (kHz) 10^3 Hz Russia CIS unk.jpg
Russian Intelligence 200bd/1000Hz FSK One-way error-correcting broadcast system, used by one of Russian intelligence agencies for delivery of messages to their operatives abroad on fixed schedules. MHzMegaHertz (MHz) 10^6 Hz — 23 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Russia Russian Intelligence 200bd 1000Hz FSK.jpg
SI-ARQ SI-ARQAutomatic Repeat reQuestAutomatic Repeat Query, also known as ARQAutomatic Repeat reQuestAutomatic Repeat Query-S and ARQAutomatic Repeat reQuestAutomatic Repeat Query-1000S, is a simplex ARQAutomatic Repeat reQuestAutomatic Repeat Query system designed by Siemens formerly used by Austrian and Indonesian diplomatic services. No longer used today. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Europe SI-ARQ.png
SI-FEC SI-FECForward Error Correction, also known as FECForward Error Correction-S, FECForward Error Correction 1000 Simplex, and FECForward Error Correction-1000S, was the FECForward Error Correction variant of SI-ARQAutomatic Repeat reQuestAutomatic Repeat Query, and was only used under extremely poor propagation conditions. SI-FECForward Error Correction was developed by Siemens and was used by Austrian and Indonesian diplomatic services. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 280 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Europe SI-FEC.png
SIGFOX SIGFOX is a IoT wireless network system utilizing ETSIEuropean Telecommunications Standards Institute. An independent, not-for-profit, standardization organization in the telecommunications industry in Europe, developing global telecommunications standards.'s specification for Low Throughput Networks (LTN) and Ultra Narrow-Band (UNB) modulation. 868 MHzMegaHertz (MHz) 10^6 Hz — 868.6 MHzMegaHertz (MHz) 10^6 Hz RAW BPSKBinary Phase-Shift Keying (1 bit per symbol) 200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide 3 SIGFOX.jpg
SITOR-A SITOR-A (Also known as AMTOR-A) is one of two modes of SITOR, which stands for Simplex Teletype Over Radio. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide SITOR-A.jpg
SITOR-B SITOR-B is one of two modes of SITOR (Simplex Teletype Over Radio). MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide SITORB.jpg
SP-14 (XP) SP-14 (XP) was a 14 tone MFSKMultiple Frequency Shift-Keying mode with origins from the Russian Intelligence and Foreign Ministry. Also known as NUM-13. Inactive since 2005, superseded by XPA. MHzMegaHertz (MHz) 10^6 Hz — 12 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation MFSKMultiple Frequency Shift-Keying 1.2 kHzKiloHertz (kHz) 10^3 Hz Russia XP.png
SPREAD SPREAD, also known as AUTOSPEC Mk2, SPREAD-11, SPREAD-21, and SPREAD-51, was a FECForward Error Correction system used by Romanian diplomatic stations and the Brazilian Navy and shore stations. SPREAD is considered the successor to AUTOSPEC. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide SPREAD.jpg
STANAG 4197 STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4197 is a NATONorth Atlantic Treaty Organization QPSKQuadrature Phase-Shift Keying (2 bits per symbol) OFDMOrthogonal Frequency-Division Multiplexing signal used in ANDVT modems that transmit encrypted digital voice over HFHigh Frequency (3-30 MHz). MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 2.3 kHzKiloHertz (kHz) 10^3 Hz Worldwide STANAG 4197.jpg
STANAG 4285 STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4285 is specified by the NATONorth Atlantic Treaty Organization (North Atlantic Treaty Organization) Military Agency for Standardization in "Characteristics of 1200 / 2400 / 3600 Bits per Second Single Tone Modulators / Demodulators for HFHigh Frequency (3-30 MHz) Radio Links" 1.89 MHzMegaHertz (MHz) 10^6 Hz — 22.7 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.75 kHzKiloHertz (kHz) 10^3 Hz Worldwide STANAG 4285.jpg
STANAG 4415 STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4415 is a NATONorth Atlantic Treaty Organization standard for robust, non-hopping digital data communication, used on severely degraded HFHigh Frequency (3-30 MHz) channels with large Doppler and multipath spreads. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.75 kHzKiloHertz (kHz) 10^3 Hz Worldwide STANAG 4415.jpg
STANAG 4481 STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4481, also known as CRATT, Link-4, and NATONorth Atlantic Treaty Organization-75, is specified by the NATONorth Atlantic Treaty Organization (North Atlantic Treaty Organization) Military Agency for Standardization as a "Minimum technical equipment standards for naval HFHigh Frequency (3-30 MHz) shore-to-ship broadcast system" 2.815 MHzMegaHertz (MHz) 10^6 Hz — 18.016 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying, PSKPhase-Shift Keying 1.5 kHzKiloHertz (kHz) 10^3 Hz — 2.75 kHzKiloHertz (kHz) 10^3 Hz Worldwide STANAG 4481.jpg
STANAG 4529 STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4529 a modification of STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4285 to deliver data and voice in 1240 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). of bandwidth at rates of up to 1800 bpsBits per second (bps). MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 1.24 kHzKiloHertz (kHz) 10^3 Hz Worldwide 4529 long.jpg
STANAG 4539 STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4539 or MIL-STD-188-110B/C Appendix C is a HDR (110B) / MDR (110C) serial PSKPhase-Shift Keying/QAMQuadrature Amplitude Modulation signal that can reach speeds up to 9600 bpsBits per second (bps) (128000 bpsBits per second (bps) with no interleaving). MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, QAMQuadrature Amplitude Modulation kHzKiloHertz (kHz) 10^3 Hz Worldwide QAM 8000 M.jpg
STANAG 5065 STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 5065 is defined as "Minimum Standards for Naval Low Frequency (LFLow Frequency (30-300 kHz)) Shore-To-Ship Surface Broadcast Systems", with two primary protocols, FSK75 and MSK300. 50 kHzKiloHertz (kHz) 10^3 Hz — 160 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying, MSKMinimum-Shift Keying (When Shift/Bd = 0.5. It is impossible to get this ratio to be lower than 0.5, hence it is called the 'Minimum' shift.) 235 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 360 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide STANAG 5065 FSK.jpg
STP403 Bus PIT System STP403 is a bus PITPassenger Information Terminals, such as bus timetable displays at bus stops system used to update digital displays at bus stops. STP403 was developed by French companies INEO and CESATEC. 164 MHzMegaHertz (MHz) 10^6 Hz — 468.488 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FFSKFast Frequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz France Fouine91 MPT1327-Like.jpg
SWED-ARQ SWED-ARQAutomatic Repeat reQuestAutomatic Repeat Query, also known as ARQAutomatic Repeat reQuestAutomatic Repeat Query-SWE, was a Swedish simplex ARQAutomatic Repeat reQuestAutomatic Repeat Query system used by Swedish diplomatic services. This protocol supported three packet lengths and was able to change packet length mid-transmission. No longer used today. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Sweden SWED-ARQ.jpg
Saab Grintek MHF-50 MFSK Modem The MHF-50 MFSKMultiple Frequency Shift-Keying Modem by Saab Grintek Technologies in South Africa is a data modem that utilizes RTTYRadio TeleTYpe, 2-FSKFrequency-Shift Keying, and 33-MFSKMultiple Frequency Shift-Keying to transmit data 4.245 MHzMegaHertz (MHz) 10^6 Hz — 12.982 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying, FSKFrequency-Shift Keying 2.2 kHzKiloHertz (kHz) 10^3 Hz South Africa MHF-50.jpg
Serdolik Serdolik is a MFSKMultiple Frequency Shift-Keying signal used by the Russian diplomatic service. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 1.4 kHzKiloHertz (kHz) 10^3 Hz Russia Crowd 36thmb.jpg
Siemens CHX-200 FSK Modem CHX200, also known as Siemens CHP200 and PRC-921/GY, is a backpack HFHigh Frequency (3-30 MHz) ECCOM transceiver, designed and built by Siemens. 1.5 MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide CHX200.jpg
Single Sideband Voice Single side band, either lower side band or upper side band, is an AMAmplitude Modulation modulated voice channel with one sideband suppressed. Used in the HFHigh Frequency (3-30 MHz) band by amateur radio hams and aircraft weather reports. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz SSB AMAmplitude Modulation 1.9 kHzKiloHertz (kHz) 10^3 Hz Worldwide SSB Voice.jpg
Slow-Scan Television (SSTV) Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images. MHzMegaHertz (MHz) 10^6 Hz — 300 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FMFrequency Modulation 2.5 kHzKiloHertz (kHz) 10^3 Hz Worldwide Robot 36waterfall.jpg
Sonne Sonne (Called Consol by the Britons) was a low-frequency radio range based radio navigation system used for long range navigation. 250 kHzKiloHertz (kHz) 10^3 Hz — 350 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) OOKOn-Off Keying Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Consol.png
T-230-1A 'Mahovik' Mahovik, "Flywheel" in Russian, is a PSKPhase-Shift Keying based mode that can transmit both voice and data. It is transmitted from a Russian T-230-1A radio transceiver. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying 2.5 kHzKiloHertz (kHz) 10^3 Hz Russia Flywheel.jpg
TDF TDF is a time signal transmitted on the carrier of France's France Inter longwave AMAmplitude Modulation radio station on 162 kHzKiloHertz (kHz) 10^3 Hz. 162 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). France TDF.jpg
THOR THOR is an adaptation of DominoEX with MFSK16 binary varicode and FECForward Error Correction. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) IFKIncremental Frequency Keying 173 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 524 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide THORthmb.png
THROB THROB is a unique data mode that relies heavily on DSP techniques, using MFSKMultiple Frequency Shift-Keying and AMAmplitude Modulation modulation techniques together. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 72 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 188 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide THROB1prev.png
TT2300 TT2300, also known as TT2300B, TT2300-ARQAutomatic Repeat reQuestAutomatic Repeat Query, TRA-2300, and TPLEX, is an 8MFSK synchronous system developed by Thrane & Thrane of Denmark (acquired by UK defense firm Cobham in 2012). 5.029 MHzMegaHertz (MHz) 10^6 Hz — 7.72 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 1.6 kHzKiloHertz (kHz) 10^3 Hz — 1.7 kHzKiloHertz (kHz) 10^3 Hz Worldwide TT2300 100 Bd.jpg
TWINPLEX TWINPLEX, also known as F7B4 and TWINPLEX-SITOR, was a diplex 4-FSKFrequency-Shift Keying ARQAutomatic Repeat reQuestAutomatic Repeat Query mode developed by Mackay Radio and Telegraph Company, based in New York City, in the early 1950's. TWINPLEX was used by Interpol, the United Nations, and other diplomatic services. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 450 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 950 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Danish TWINPLEX.jpg
Terrestrial Trunked Radio (TETRA) TETRA is a professional mobile radio and two-way transceiver (walkie-talkie) specification 380 MHzMegaHertz (MHz) 10^6 Hz — 430 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying 25 kHzKiloHertz (kHz) 10^3 Hz Europe TETRA.jpg
Tetrapol Tetrapol is a digital professional mobile radio standard for digital voice and data communication used by public safety and military throughout Europe. Tetrapol was originally developed by Matra Communication (Currently part of EADS/Airbus Group) in France in the 1980's. 370 MHzMegaHertz (MHz) 10^6 Hz — 400 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation GMSKGaussian Minimum-Shift Keying 10 kHzKiloHertz (kHz) 10^3 Hz — 12.5 kHzKiloHertz (kHz) 10^3 Hz Europe Tetrapolnew.jpg
Thales Système 3000 HF Modem Thales Système 3000 is a HFHigh Frequency (3-30 MHz) modem capable of many different modes of transmission. It has a unique preamble and format to it's signals. 1.5 MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz — 3 kHzKiloHertz (kHz) 10^3 Hz Worldwide Systeme Thales ALE and Vx.jpg
Thales Système 3000 Skyhopper Thales Système 3000 Skyhopper is the frequency hopping mode of the Système 3000 Modem. Characterized by it's very short bursts and frequency hopping behavior. 1.5 MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz — 2.6 kHzKiloHertz (kHz) 10^3 Hz Worldwide ALE psk mfsk thales skyhopper.jpg
Thales Système 3000 Voice Scrambler Voice Scrambling mode from Thales Système 3000 HFHigh Frequency (3-30 MHz) Modem. Has characteristic PSKPhase-Shift Keying and MFSKMultiple Frequency Shift-Keying bursts at the beginning and end of a voice transmission. 1.5 MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide Scrambled thales.jpg
The Buzzer (ZhUOZ MDZhB UZB76) The Buzzer, call-sign ZhUOZ (formerly MDZhB and UZB76), is a Russian based military station that occasionally broadcasts Monolit format messages in Russian. Its trademark buzzer is constantly transmitted while there is no message to broadcast. 4.625 MHzMegaHertz (MHz) 10^6 Hz — 6.998 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) 2.8 kHzKiloHertz (kHz) 10^3 Hz Russia Buzzer.png
Tire Pressure Monitoring System (TPMS) Signal is from a Chrysler TPMS (Tire-Pressure Monitoring System) sensor. 315 MHzMegaHertz (MHz) 10^6 Hz — 433 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation Worldwide TPMS.png
Toyota Car Key Wireless entry rolling code car key. 315 MHzMegaHertz (MHz) 10^6 Hz — 433 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation 40 kHzKiloHertz (kHz) 10^3 Hz Worldwide ToyotaCarFob Waterfall.png
UK AM Data System (UK-AMDS) UK AMAmplitude Modulation Data System (UK-AMDS) was developed by BBC Research and Development in 1984 as a way to transmit low bitrate data on BBC Radio 4's LFLow Frequency (30-300 kHz) AMAmplitude Modulation carrier. Elements of this system were adopted into ETSIEuropean Telecommunications Standards Institute. An independent, not-for-profit, standardization organization in the telecommunications industry in Europe, developing global telecommunications standards.'s AMSS. 198 kHzKiloHertz (kHz) 10^3 Hz SSB AMAmplitude Modulation (PSKPhase-Shift Keying) 85 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). United Kingdom BBC teleswitch 2.png
UK GOV/MIL WINDRM51 UK GOV/MIL "WinDRM51" variant. Unknown purpose, But link between UK & Cyprus has been found some years ago. 9.104 MHzMegaHertz (MHz) 10^6 Hz — 13.451 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) OFDMOrthogonal Frequency-Division Multiplexing 2.5 kHzKiloHertz (kHz) 10^3 Hz Europe UK WINDRM51.jpg
UTC (Coordinated Universal Time) Time Standard UTC (Coordinated Universal Time) time standard transmission from NIST (National Institute of Standards and Technology) stations WWV in Fort Collins, Colorado USA and WWVH in Kauai, Hawaii. 2.5 MHzMegaHertz (MHz) 10^6 Hz — 25 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation kHzKiloHertz (kHz) 10^3 Hz United States UTC Image.jpg
Unknown Signal Unknown signal at 926422000hz
Unkown 0p012 Unknown VLFVery Low Frequency (3-30 kHz) signal ~12.5 kHzKiloHertz (kHz) 10^3 Hz. Interference every 10-30 minutes: 2-3 ~12.5 KHzKiloHertz (kHz) 10^3 Hz tones, separated by approximately a second. 12.5 kHzKiloHertz (kHz) 10^3 Hz 24 kHzKiloHertz (kHz) 10^3 Hz UNKWN 00p012.png
VDEW VDEW is a 5-tone selcall mode defined by the Vereinigung Deutscher Elektrizitaetswerke in Germany. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide VDEW 5-tone.jpg
VEZHA-S Two-way 100 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second./500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russian Telegraph system, attributed name VEZHA-C (Tower-S), usage claimed to be by Russian Ministry of Communications (MinComSvyaz Rossii). Possible usage in meteorology under callsign RWD59. 2.755 MHzMegaHertz (MHz) 10^6 Hz — 12.165 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 650 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia RUS FSK COMMS.jpg
VHF Data Link - Mode 2 (VDL-M2) VDL-M2 (Known as VDL2 or VDLM2) is an evolution of ACARS that's 10 times faster and supports a wider range of information to transmit between aircraft and ground stations. VDL-M2 was developed by ARINC under Rockwell Collins. 117.975 MHzMegaHertz (MHz) 10^6 Hz — 137 MHzMegaHertz (MHz) 10^6 Hz RAW PSKPhase-Shift Keying 25 kHzKiloHertz (kHz) 10^3 Hz Worldwide VDL2 Waterfallthmb.jpg
VHF Omnidirectional Range (VOR) A type of radio navigation system used by aircraft. It is distinctive in that the center frequency is flanked by two FMFrequency Modulation waves. 108 MHzMegaHertz (MHz) 10^6 Hz — 117.95 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation AMAmplitude Modulation, FMFrequency Modulation 21 kHzKiloHertz (kHz) 10^3 Hz Worldwide VORthmbnew.png
VISEL VISEL, also known as YUG-MIL 120.9 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., FECForward Error Correction-12, and YUG-MIL FECForward Error Correction, is a synchronous teleprinter system used by the former Yugoslav military. No longer active today. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Eastern Europe VISEL.jpg
VOICE VOICE is a MFSKMultiple Frequency Shift-Keying mode developed by Patrick Lindecker F6CTE in 2006, and was derived from Olivia. It was designed for blind or partially sighted amateur radio operators. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MFSKMultiple Frequency Shift-Keying 200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide VOICE.png
Vaisala RS41-SG Weather Balloon (Radiosonde) Weather balloon (radiosonde) telemetry data. 400 MHzMegaHertz (MHz) 10^6 Hz — 410 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation GFSKGaussian Frequency-Shift Keying 4.8 kHzKiloHertz (kHz) 10^3 Hz Worldwide Rs41 radiosonde wf.png
Vaisala RS92-KL Weather Balloon (Radiosonde) RS92-KL and RS92-K are analog radiosondes built by Vaisala in Finland. These radiosondes are used for weather balloons. 400 MHzMegaHertz (MHz) 10^6 Hz — 406 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying 200 kHzKiloHertz (kHz) 10^3 Hz Worldwide RS92-KL.jpg
Vaisala RS92-SGP Weather Balloon (Radiosonde) Weather balloon (radiosonde) telemetry data. 400.15 MHzMegaHertz (MHz) 10^6 Hz — 405.99 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation GFSKGaussian Frequency-Shift Keying 10 kHzKiloHertz (kHz) 10^3 Hz Worldwide VaisalaRS92SGP.png
Vehicle Counting System Data transmitted from a vehicle counting system installed in car parks. The data is frequency hopping over 10 MHzMegaHertz (MHz) 10^6 Hz. 915 MHzMegaHertz (MHz) 10^6 Hz — 925 MHzMegaHertz (MHz) 10^6 Hz RAW FSKFrequency-Shift Keying 10 MHzMegaHertz (MHz) 10^6 Hz Australia Flinders Uni Vehicle Counting System Waterfall.PNG
WEFAX Radiofax (Also known as Weatherfax, HFHigh Frequency (3-30 MHz)-FAX, WEFAX, and Weather Facsimile) is a slow scan analog image transmission mode used for the transmission of press images, weather charts, newspapers, and meteorological reports. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FMFrequency Modulation kHzKiloHertz (kHz) 10^3 Hz Worldwide Weather Fascimile.jpg
WLAN Interfering with Bluetooth A WLAN signal interfering with a Bluetooth signal. WLAN Bluetooth2b.png
WLO AMAmplitude Modulation CWContinuous Wave kHzKiloHertz (kHz) 10^3 Hz Home Base Mobile , AL Wlo.png
WinDRM WinDRM is an amateur radio derivation of the Digital Radio Mondiale (DRM) digital voice and data transmission protocol. Also known as HamDRM, and Digital SSTV. 14.236 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) QAMQuadrature Amplitude Modulation, OFDMOrthogonal Frequency-Division Multiplexing 2.2 kHzKiloHertz (kHz) 10^3 Hz — 2.4 kHzKiloHertz (kHz) 10^3 Hz Worldwide Digital sstvimg.jpg
Wireless Temperature Sensor The freezer temperature is requested by a master at regular intervals, and the slave attached to a freezer responds. The communication format appears to be a variant of chirp spread spectrum, (although the spectrum it consumes is quite narrow at ~150 kHzKiloHertz (kHz) 10^3 Hz). 434 MHzMegaHertz (MHz) 10^6 Hz Chirp Spread Spectrum 150 kHzKiloHertz (kHz) 10^3 Hz Australia Waterfall spectrum of Flinders Uni freezer communication.PNG
XM Satellite Radio XM Satellite Radio: Terrestrial Repeater Signal 2,332.5 MHzMegaHertz (MHz) 10^6 Hz — 2,345 MHzMegaHertz (MHz) 10^6 Hz RAW OFDMOrthogonal Frequency-Division Multiplexing, PSKPhase-Shift Keying MHzMegaHertz (MHz) 10^6 Hz United States XM sattelite radio.jpg
Yachta T-219 Voice Scrambler Yachta or Yakhta (Russian for 'Boat') T-219 is an analogue voice scrambler. It is unique in that an FSKFrequency-Shift Keying sync signal is transmitted in the middle of the main signal, with the scrambled voice stream split above and below the FSKFrequency-Shift Keying signal. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 2.7 kHzKiloHertz (kHz) 10^3 Hz Russia Yachta.jpg
Yugoslavian 16-Tone Modem The Yugoslavian 16-Tone Modem, also known as YUG-Diplo 16-Tone, is a 16 tone OFDMOrthogonal Frequency-Division Multiplexing PSKPhase-Shift Keying modem used in former Yugoslavia for diplomatic use. No longer used today. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 2.1 kHzKiloHertz (kHz) 10^3 Hz Eastern Europe YUG 16 tone.jpg
Yugoslavian 20-Tone Modem The Yugoslavian 20-Tone Modem, also known as YUG-MIL 20-Tone and YUG Diplo 20-Tone, is a 20 tone OFDMOrthogonal Frequency-Division Multiplexing PSKPhase-Shift Keying modem used in former Yugoslavia for military and diplomatic use. No longer used today. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PSKPhase-Shift Keying, OFDMOrthogonal Frequency-Division Multiplexing 2.2 kHzKiloHertz (kHz) 10^3 Hz Eastern Europe Yug Mil.jpg
ZVEI Selcall ZVEI is a family of selcall modes defined by the Zentralverband der Electrotechnischen Industrie in Germany. Selcall modes include ZVEI-1, ZVEI-2, ZVEI-3, PZVEI, DZVEI, and PDZVEI. 30 MHzMegaHertz (MHz) 10^6 Hz — 800 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation MFSKMultiple Frequency Shift-Keying kHzKiloHertz (kHz) 10^3 Hz Worldwide Zvei-1 5-tone.jpg

List of Known Signals in Database[edit]