Signal Name
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| Description
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stringclasses 31
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EFR Teleswitch | EuropΓ€ische 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 kHz β 139.9 kHz | USB | FSK | 1 kHz | Europe | null | null |
ELEKTRO-L GGAK-E Direct Broadcast | Broadcasts the data from the GGAK-E cosmic ray detector onboard ELEKTRO-L geostationary weather satellites | 1,693 MHz | DSB | PSK | 15 kHz | Asia, Europe | null | null |
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 MHz β 162.55 MHz | NFM | FSK | 5 kHz β 30 kHz | United States | null | null |
Emergency Managers Weather Information Network (EMWIN) - Repeater | The Emergency Managers Weather Information Network (EMWIN) is a system for distributing a live stream of weather information in the United States. This is the VHF Repeater of the network. | 163.3 MHz β 168.813 MHz | NFM | AFSK | 20 kHz | United States | null | null |
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 MHz β 941 MHz | NFM | GFSK | 6.25 kHz β 12.5 kHz | Worldwide | null | null |
Eurobalise downlink | Downlink from train to balise. A Eurobalise is a specific variant of a balise, a transponder placed between the rails of a railway. | 27.095 MHz | AM | null | null | Europe | null | null |
FLEX | FLEX (Flexible Wide Area Paging Protocol) is Motorola's high speed one-way paging protocol that supports 1600, 3200, and 6400 bps. FLEX can transmit tone, numeric, alphanumeric, and binary data. | 152.6 MHz β 931.938 MHz | NFM | FSK, 4FSK | 5 kHz | Worldwide | null | null |
FM Broadcast Radio | Commercial Broadcast FM radio stations. Used for the broadcast of many different radio programs, including music, news, sports, weather, and talk shows. | 65 MHz β 108 MHz | WFM | FM | 38 kHz β 200 kHz | Worldwide | null | null |
FM NBTV | FM NBTV is a method to send moving images in a very narrow bandwidth (maximum 3 KHz) | 3 MHz β 470 MHz | SSB, FM | FM, BPSK | 2.3 kHz | Worldwide | null | null |
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 MHz β 10.149 MHz | USB | IFK+ | 300 Hz | Worldwide | null | null |
FST4W | FST4W is an amateur radio digital protocol designed particularly for the LF and MF bands, for quasi-beacon transmissions of WSPR-style messages. FST4W uses 4-GFSK modulation and offers T/R sequence lengths of 120, 300, 900, and 1800 seconds. | 136 kHz β 1.839 MHz | USB | 4-GFSK | null | Worldwide | β | null |
FT4 | FT4 is an amateur radio contesting communication protocol developed by Joe Taylor (K1JT) and Steve Franke (K9AN) descended from FT8. | 10.14 kHz β 144.17 MHz | USB | GFSK | 83 Hz | Worldwide | null | null |
FT8 | FT8 is an extremely-weak-signal amateur radio mode that transmits very limited communications. JS8, a variant of FT8, can send full conversations and relay messages | 1.84 MHz β 144.174 MHz | USB | GFSK | 50 Hz | Worldwide | null | null |
FUNcube-1 Telemetry | FUNcube-1 Telemetry is a telemetry signal sent from the Funcube-1 Cubesat amateur radio satellite. | 145.935 MHz | USB | PSK | 2 kHz | Worldwide | null | null |
Federal Signal Modem-MSK | Signalling protocol developed for Federal Signal's line of civil defense warning siren systems. This signal is used for activation and telemetry of all units in a network. | 150 MHz β 160 MHz | NFM | MSK | 6 kHz | United States | null | null |
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 MF/HF radiotelex calls. | 2.177 MHz β 156.525 MHz | USB | FSK | 350 Hz | Worldwide | null | null |
GOES CDA Telemetry | Telemetry signal sent from GOES 16, 17 and 18. GOES is a family of Geostationary Operational Environmental Satellite operated by the United States National Oceanic and Atmospheric Administration (NOAA). | 1,693 MHz | RAW | BPSK | 80 kHz | United States, Asia | β | null |
GOES Data Collection System (DCS) | Comes from the geostationary satellites GOES 16 and GOES 17. Relays information about water levels, lightning strikes, and other information. | 1,679.9 MHz β 1,680.2 MHz | USB | 8PSK | 300 Hz β 1.2 kHz | Worldwide | null | null |
GOES High Rate Information Transmission (HRIT) | GOES HRIT is a retransmission of satellite imagery and other information from the GOES-R series of satellites. | 1,694.1 MHz | RAW | BPSK | 1.205 MHz | Worldwide | β | null |
GRAVES | The Grand RΓ©seau AdaptΓ© Γ la Veille Spatiale (GRAVES) system is a French space-surveillance system for low-orbit (up to 1000km) satellites. Emitter is based near Dijon, France. | 143.05 MHz | RAW I/Q | null | 1 kHz | France | null | null |
Glenayre Paging Link | Glenayre's Paging Link. With QAM being used, It is a way to upkeep a linked paging transmitter when no data is broadcast. Glenayre C2100/C2000 model control systems were likely to use this. | 152 MHz β 512 MHz | NFM | QAM | null | United States | null | null |
Global Positioning System (GPS) | GPS is the USA's global navigation satellite system which provides precision position, navigation, and timing services to devices around the globe. | 1,176.45 MHz β 1,575.42 MHz | USB | BPSK, QAM, DSSS, BOC, TMBOC | 22 MHz β 25 MHz | Worldwide | null | null |
Global System for Mobile Communications (GSM) | GSM (Global System for Mobile Communications) is a standard developed by ETSI to describe the protocols for second-generation (2G) digital cellular networks used by mobile phones. As of 2014, it has become the default global standard for mobile communications. | 450 MHz β 1,900 MHz | RAW, AM, FM | GMSK | 200 kHz | Worldwide | null | null |
Gonets | Gonets (Russian ΠΠΎΠ½Π΅Ρ, for Messenger) is a Russian civilian low Earth orbit communications satellite system. | 265 Hz β 388 MHz | NFM | GMSK | 20 kHz | Worldwide | null | null |
Graw DFM-17 (Radiosonde) | Radiosonde developed by Graw/Noris Group GmbH for upper air weather observation | 400 MHz β 405.99 MHz | NFM | GFSK | 10 kHz | Worldwide | null | null |
Grimeton Radio (SAQ) | SAQ stands as the sole transmitter reliant on an alternating current generator. Recognized as a UNESCO World Heritage site, it employs the last operational Alexanderson alternator for RF production. | 17.2 kHz β 40.4 kHz | CW | null | null | Sweden | null | null |
HC-265 Voice Scrambler | HC-265 is a Voice Scrambling mode developed by Hagelin Crypto for their HC-265 CRYPTOCOM secure voice unit. | 3 MHz β 30 MHz | USB | FSK | 2.25 kHz β 3 kHz | Worldwide | null | null |
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 AM band implementation of HD Radio. | 535 kHz β 1.7 MHz | RAW | OFDM | 30 kHz | United States | null | null |
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 FM band implementation of HD Radio. | 87.7 MHz β 107.9 MHz | RAW | OFDM | 400 kHz | United States | null | null |
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 MHz β 15.016 MHz | USB | USB | 2.95 kHz | Worldwide | null | null |
HORYU-4 Telemetry | Telemetry signal sent from the HORYU-4 university-class satellite Launched by Kyushu Institute of Technology in Japan | 437.375 MHz | USB | BPSK | null | Worldwide | null | null |
High Frequency Data Link (HFDL) | HFDL, also known as HF-ACARS, ARINC 753, ARINC 635, and HF DATALINK,is a data link that aircraft use to communicate short messages over long distances using HF signals. | 2.9 MHz β 22 MHz | USB | PSK | 2.4 kHz | Worldwide | null | null |
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 STANAG 5066 parameters. | 14.35 MHz β 14.829 MHz | USB | PSK, OFDM, QAM | 3 kHz | Spain | null | null |
High Resolution Data (HRD) | The HRD direct broadcast is an X-band continuous downlink from NOAA JPSS satellites of mission environmental data to users on the ground that are equipped with a suitable receiver. | 7,812 MHz | RAW | OQPSK, QPSK | 25 MHz β 35 MHz | Worldwide | β | null |
Horus Binary 4FSK - v2 | An efficient RTTY-like 4FSK mode that transmits binary data, used for amateur high altitude balloon telemetry. Developed by the Project Horus group. | 431 MHz β 434 MHz | USB | 4FSK | 1 kHz | Worldwide | null | null |
Hyundai Mobis RKE-4F16 Key Fob | Hyundai Mobis RKE-4F16 Wireless Key Fob for Hyundai Sonata models 2014-Present. | 433.92 MHz | WFM | FSK | 110 kHz | Worldwide | null | null |
ICAO Selcal | ICAO Selcal (also known as AVCALL, ANNEX 10, or just SELCAL) is a HF/VHF aviation selective calling system used by ground stations to initiate radio communications with aircraft. | 3 MHz β 300 MHz | USB | MFSK | 1.5 kHz | Worldwide | null | null |
ICARUS (International Cooperation for Animal Research Using Space) | ICARUS aims its services primarily at scientific groups that perform basic and application-oriented research with migrating animals. | 468.1 MHz | NFM | PSK | 32 kHz | Worldwide | null | null |
ICV | ICV is a NATO-operated VLF transmitted located in the island of Tavolara, Sardinia, Italy. | 20.27 kHz β 20.76 kHz | CW | MSK | null | Italy | null | null |
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 MHz | AM | OOK | 3 kHz | Worldwide | null | null |
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 MHz β 3,687 MHz | USB | PSK | 800 Hz β 10.5 MHz | Worldwide | null | null |
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 MHz β 1,539.685 MHz | USB | PSK | 2.5 kHz | Worldwide | null | null |
Instrument Landing System | Radio navigation system that allows aircraft to perform precision approaches in low visibility conditions. | 108 MHz β 335 MHz | AM | null | 15 kHz | Worldwide | null | null |
Integrated Digital Enhanced Network (iDEN) | iDEN is a TDMA-based digital wireless standard developed by Motorola. It is a type of trunked radio with cellular phone benefits. | 806 MHz β 869 MHz | NFM | QAM, TDMA | 18.5 kHz | Worldwide | null | null |
Interferance signal from old computer screen | A very crunchy signal coming from my Old hyundai computer screen, the sound changes depending on what is shown on the screen | 639.006 MHz | AM, DSB | null | 23 kHz | WORLDWIDE | null | null |
Ionized Meteor Trails | Meteors traversing the E region of the atmosphere approximately 60 - 90 miles up create ionizing trails which can reflect and refract radio waves from commercial FM radio stations that are hundreds and sometimes thousands of miles away from the receiver. | 88.3 MHz | FM | null | null | Worldwide | null | null |
Ionosonde | An Ionosonde (Also known as a chirpsounder or ionospheric sounder) is a radar that examines the Ionosphere and monitors HF propagation conditions by sweeping the HF band and receiving the echoes. | 1 MHz β 40 MHz | USB | FMCW | 1 Hz | Worldwide | null | null |
Iranian Navy QPSK Modem | Iranian Navy QPSK Modem is a QPSK mode used by the Iranian Navy. It has gone through several versions. The current version (2015) is V2 and supports speeds of 468 Bd, 936 Bd, and 1872 Bd. | 8.046 MHz β 17.382 MHz | USB | PSK | 300 Hz β 2.85 kHz | Iran | null | null |
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 MHz β 1,626.5 MHz | RAW | PSK | 31.5 kHz | Worldwide | null | null |
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 QPSK parallel mode before 110 Serial transmission. Possible use as a broadcast transmitter for ships. Used by the Israeli Navy 4XZ station from Haifa. | 3 MHz β 30 MHz | USB | PSK | 2.75 kHz | Israel | null | null |
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 kHz β 60 kHz | USB | AM | 1 Hz | Japan | null | null |
JS8 | JS8Call is an extremely-weak-signal amateur radio communication mode based on FT8. It allows FT8 to be used for conversations and message relaying. | 1.842 MHz β 50.318 MHz | USB | GFSK | 50 Hz | Worldwide | null | null |
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 MHz β 50.276 MHz | USB | MFSK | 180 Hz β 710 Hz | Worldwide | null | null |
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 MHz β 8.703 MHz | USB | PSK | 2 kHz | Japan | null | null |
Jim Creek (NLK) | Jim Creek Naval Radio Station is used by the US Navy to transmit commands to distant submarines. | 24.8 kHz | CW | MSK | 300 Hz | United States | null | null |
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. | 5.7 MHz β 33 MHz | USB | FMCW | 3 kHz β 60 kHz | Australia | null | null |
John Deere RTK Radio 450 | Real-time Kinematic GPS is a satellite navigation technique used to enhance the precision of position data derived from satellite-based positioning systems (global navigation satellite systems, GNSS) such as GPS, BeiDou, GLONASS, Galileo and NavIC. | 435 MHz β 470 MHz | FM | FSK | 7.49 kHz | Worldwide | null | null |
Kia SVI-JFRGE04 Key Fob | Kia SVI-JFRGE04 Keyless entry transponder used for multiple Kia models, for model years 2014-2020 | null | NFM | FSK | 55 kHz | Worldwide | null | null |
LEOSAR Downlink | Cospas-Sarsat downlink from polar-orbiting weather satellites. The International Cospas-Sarsat Programme is a satellite-aided search and rescue initiative. | 1,544.5 MHz | NFM | PSK | 350 kHz | Worldwide | null | null |
LORAN | LORAN (short for LOng RAnge Navigation) is a hyperbolic radio navigation system. | 100 kHz | USB | PPM | 20 kHz | Worldwide | null | null |
LTE Uplink | Acquired via telecommunications carrier hardware during interference investigation of an Australian cellular network. | 700 MHz β 2,600 MHz | SC-FDMA | QPSK | 5 MHz | Worldwide | null | null |
LTE-M | null | 412.5 MHz β 2,690 MHz | AM | OFDMA, 16-QAM | 1.08 MHz | Worldwide | null | null |
Lightning Sferics | VLF RF emissions from lightning in the atmosphere that can affect up to HF frequencies and beyond depending on strength. Has a popping crackle sound with both USB and AM modes of reception. | 0 Hz β 30 MHz | null | null | null | Worldwide | null | null |
Link-11 | Link-11 (Also known as ALLIGATOR, STANAG 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 NATO and the US Military for Maritime Tactical Data Exchange. | 2 MHz β 30 MHz | USB | PSK | 2.5 kHz β 6 kHz | Worldwide | null | null |
Link-11 (UHF) | This is the UHF band variant of Link-11, which is transmitted on a FM carrier. The FM-demodulated baseband is identical to the HF Link-11 waveform. | 225 MHz β 399.975 MHz | NFM | PSK | 30 kHz | Worldwide | null | null |
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 MHz | NFM | FFSK | 10 kHz | Worldwide | null | null |
LoRa | LoRa (Long Range) is a proprietary low-power wide-area network modulation technique. | 433 MHz β 915 MHz | FM | CSS | 250 kHz | Worldwide | null | null |
Lockheed Martin LMS-6 (Radiosonde) | The LMS-6 is a radiosonde developed by Lockheed Martin which contains a temperature, barometric pressure (On the 1680 MHz models only), and humidity sensor for upper air weather observations. | 400 MHz β 1,682 MHz | NFM | GFSK | 10 kHz | Worldwide | null | null |
Logic Trunked Radio (LTR) | Logic Trunked Radio, is an analog trunked radio format developed by EF Johnson Company. | 150 MHz β 470 MHz | NFM | FSK | 12.5 kHz β 25 kHz | null | null | null |
Logitech(R) Wireless Mouse+Keyboard Signal | This signal comes from Logitech(R) Brand wireless mouse and keyboard combo unit. | 2,400 MHz | RAW | PPM, GFSK | 500 kHz | Worldwide | β | null |
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 MHz β 138 MHz | RAW | QPSK | 120 kHz | Worldwide | β | null |
M17 RF Protocol | An open source digital mode developed for amateur and other radio applications. | 30 MHz β 10,500 MHz | NFM | 4FSK | 9 kHz | Worldwide | null | null |
M20 Radiosonde | Telemetry signal transmitted by M20 radiosondes | 400.15 MHz β 406 MHz | NFM | PSK | 30 kHz | Worldwide | null | null |
MDC1200 | MDC (Motorola Data Communications), also known as Stat-Alert, MDC-1200 and MDC-600, is a Motorola two-way radio low-speed data system. | 30 MHz β 960 MHz | FM | AFSK | 12.5 kHz β 20 kHz | Worldwide | null | null |
METEOR-M High Resolution Picture Transmission (HRPT) | A variant of the NOAA HRPT signal, which has a different data structure and better low-signal handling characteristics. | 1,700 MHz | RAW | PSK | 3 MHz | Worldwide | β | null |
METOP Advanced High Resolution Picture Transmission (AHRPT) | A high-speed digital link used by METOP weather satellites for direct data dissemination. | 1,701.3 MHz β 1,707 MHz | RAW | QPSK | 6 MHz | Worldwide | β | null |
MFJ-269C Antenna SWR Analyzer | Popular antenna analyzer among ham operators and the like. Output power is only ~20mW so if heard, source is nearby. Other MFJ models may be similar. | 500 kHz β 500 MHz | AM, NFM | null | 1 kHz | Worldwide | null | null |
MIL-STD-188-110 Appendix B 39-Tone | MIL-STD-188-110 Appendix B is a 39-tone OFDM DQPSK mode used to send data and voice. | 3 MHz β 30 MHz | USB | PSK, OFDM | 2.4 kHz | Worldwide | null | null |
MIL-STD-188-110 Serial | MIL-STD-188-110 Serial is a US Department of Defense standard for HF Communications, Serial PSK mode. Can transmit both data and voice with a range of interleaving and speed modes for optimal propagation. | 3 MHz β 30 MHz | USB | PSK | 2.75 kHz | Worldwide | null | null |
MOBITEX | MOBITEX is an OSI based open standard, national public access wireless packet-switched data network. | 400 MHz β 900 MHz | NFM | GMSK, FFSK | 15 kHz | Worldwide | null | null |
MONITOR-2(RS39S) | Monitor-2 is a Russian 3u Cubesat used for cosmic flare observation. It is most likely only active when above Russia. | 435.815 MHz | FM | AFSK | 12.5 kHz | Worldwide | null | null |
MPT 1327 | MPT1327 (Ministry of Posts and Telegraph 1327) is a signaling protocol standard for analog trunked radio | 162.5 MHz β 800 MHz | NFM | FFSK, FM | 10 kHz β 25 kHz | Worldwide | null | null |
MRZ-3MK Weather Balloon (radiosonde) | MRZ-3MK is a Russian weather radiosonde. | 1,680 MHz | AM | PFM | 6 MHz | Russia | β | null |
MRZ-N1 Weather Balloon (radiosonde) | MRZ-N1 is a russian weather radiosonde. | 403 MHz | FM | FSK | 5 kHz | Russia | null | null |
MSK144 | MSK144 is a Minimum Shift Keying FSK signal used for amateur radio meteor-scatter contacts. It transmits 144 bit long packets at a baudrate of 2000 bps using frequencies 1000 and 2000 Hz. | 50 MHz β 440 MHz | FM | MSK | 2.5 kHz | Worldwide | null | null |
MSM-1250 Modem | MSM-1250 (Medium Speed Modem) is a 10 FSK-2 OFDM digital data protocol used by the stand-alone modem "SkyFax", used to transmit and receive faxes on HF. | 3 MHz β 30 MHz | USB | FSK | 2.4 kHz β 2.5 kHz | Worldwide | null | null |
MT63 | MT63 is a Orthogonal Frequency Division Multiplexed (OFDM) digital data mode aimed for use in high noise environments. | 3 MHz β 30 MHz | USB | OFDM, PSK | 500 Hz β 2 kHz | Worldwide | null | null |
Mazda SKE126-01 Key Fob | SKE126-01 Key Fob used for multiple Mazda models between 2006-2014. Manufactured by Mitsubishi Electric Company. | 433.413 MHz | WFM | FSK | 100 kHz | Worldwide | null | null |
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 MHz β 23.458 MHz | USB | MFSK | 200 Hz | Russia | null | null |
Meteomodem M10 Weather Balloon (Radiosonde) | Weather balloon (radiosonde) telemetry data. | 400 MHz β 406 MHz | NFM | PSK | 30 kHz | Worldwide | null | null |
Meteomodem PilotSonde Weather Balloon | Weather balloon telemetry data. | 400 MHz β 406 MHz | NFM | FSK | 15 kHz | Worldwide | null | null |
Microsonde Mark II Weather Balloon - LORAN-C signal (Radiosonde) | Weather balloon telemetry data. The LORAN-C signal is mixed into the carrier. | 400 MHz β 406 MHz | WFM | FSK | 130 kHz | Worldwide | null | null |
Milstar | UHF FHSS Downlink of Milstar, a US joint military service satellite communications system that provides secure, jam resistant, worldwide communications. Nicknamed 'Waterdroplets' for it's characteristic waveform and sound. | 243.785 MHz β 243.822 MHz | RAW | FHSS | 50 kHz | Worldwide | null | null |
Modernised High Frequency Communications System (MHFCS) | The Modernised High Frequency Communications System (MHFCS) is an Australian Department of Defense HF System for their military communications network. Also known as AUS MIL ISB Modem, AUS MHFCS, and ADF HFCS. | 2.01 MHz β 27.478 MHz | USB | FSK | 400 Hz β 750 Hz | Australia | null | null |
Morse Code (CW) | CW Morse Code is the simplest form of transmission found virtually all over the RF bands for a variety of uses. The most common use of this is for Call-sign Beacons by both Amateur and Military operators. | 3 kHz β 250,000 MHz | CW | OOK | null | Worldwide | null | null |
Motorola ASTRO 25 HPD Air Interface | Motorola's ASTRO 25 High Performance Data Air Interface allows Motorola ASTRO 25 HPD modems to transfer data at up to 96 kbps over a 25 kHz channel in the 700 MHz or 800 MHz bands. | 769 MHz β 869 MHz | RAW | QAM | 17.7 kHz | United States | null | null |
Motorola Type II | Radio trunking control channel. | 136 MHz β 941 MHz | NFM | FSK | 16 kHz | Worldwide | null | null |
Multi Frequency Shift Keying (MFSK) | MFSK is a family of multi-frequency shift keying digital transmission modes. MFSK-8 and MFSK-16 are two well-known amateur radio modes. | 3 MHz β 30 MHz | USB | MFSK | 154 Hz β 630 Hz | Worldwide | null | null |
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 MHz β 470 MHz | NFM | FFSK | 12.5 kHz β 25 kHz | Worldwide | null | null |
NB-IOT | Narrowband Internet of Things (NB-IoT) is a Low Power Wide Area Network (LPWAN) radio technology standard developed by 3GPP to enable a wide range of cellular devices and services. | 700 MHz β 1,900 MHz | AM | QPSK | 200 kHz | Worldwide | null | null |