Signal Name
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| Description
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β | Mode
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β | Location
stringclasses 31
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|---|---|---|---|---|---|---|---|---|
NFM Voice | Used in analog walkie-talkies and communication systems. | 27 MHz β 864 MHz | NFM | FM | 5 kHz β 30 kHz | Worldwide | null | null |
NML | Naval Radio Transmitter Facility (NRTF) transmits encrypted commands to submerged US submarines. | 25.2 kHz | CW | FSK | 300 Hz | United States | null | null |
NOAA Direct Sounder Broadcast (DSB) | The Direct Sounder Broadcast (DSB) is an auxiliary telemetry downlink from NOAA Polar Operational Environmental Satellites (POES), transmitted alongside Automatic Picture Transmission (APT) broadcasts. | 137.35 MHz β 137.77 MHz | NFM | PSK | 33.5 kHz | Worldwide | null | null |
NOAA POES High Resolution Picture Transmission (HRPT) | A digital link to transmit images and other data collected from the satellite at a high resolution. | 1,698 MHz β 2,247.5 MHz | RAW | PSK | 3 MHz | Worldwide | β | null |
NOV | TACAMO (take charge and move out) is the back up communications system to the US nuclear submarine fleet in case an attack on land based transmitters disables them. A rotating fleet of Navy E6 jets equipped with 200 KW transmitters and two 2Β½-mile-long trailing wire antennas (TWA) at 35,000 ft altitude to provide 24/7 coverage. Short pings are transmitted every few seconds. | 26.9 kHz | CW | null | null | Worldwide | null | null |
NPM | Naval Radio Transmitting Facility (NRTF) sends encrypted commands to submerged US naval submarines in the Pacific. | 21.4 kHz | CW | FSK | 300 Hz | United States | null | null |
NWC | Naval Communication Station (NCS) Harold E. Holt. Used jointly by the Australian and United States navies to transmit encrypted orders to submerged submarines in the Pacific. | 19.8 kHz | CW | FSK | 300 Hz | Australia | null | null |
Near Field Communication (NFC) | Near-field communication (NFC) is a set of communication protocols that enables communication between two electronic devices over a distance of 4 cm (11β2 in) or less. | 13.56 MHz | null | ASK | 1.7 MHz | Worldwide | β | null |
Near Instantaneous Companded Audio Multiplex (NICAM) | NICAM is used to provide digital stereo audio alongside PAL video for television broadcasts. | 174 MHz β 700 MHz | RAW | PSK | 400 kHz | Worldwide | β | null |
Next Generation Digital Narrowband (NXDN) | NXDN is a digital narrowband trunked radio protocol used in commercial, business & industry, transport and Public Safety professional radio systems. | 136 MHz β 520 MHz | NFM | C4FM | 6.25 kHz β 12.5 kHz | Worldwide | null | null |
Nokia Adaptive Message Terminal | The Nokia Adaptive Message Terminal, also known as Nokia Adaptive Burst Modem and Kryapp 302, is a Finnish encrypted messaging system suggested to be used by Finnish Intelligence Services and Swedish Military. | 3 MHz β 30 MHz | USB | FSK | 1 kHz β 1.6 kHz | Worldwide | null | null |
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 kHz β 1.8 MHz | CW | A2A (AM) | 2 kHz | Worldwide | null | null |
North Korean Diplo FSK | North Korean Diplomatic FSK link, teletype radio diplomatic usage. Also known as DPRK-FSK, KRE-FSK, DPRK-ARQ, and KEGURI. Has a FEC stream mode and a burst ARQ mode. | 9 MHz β 29 MHz | USB | FSK | 1.2 kHz β 1.4 kHz | North Korea | null | null |
OFDM NBTV | OFDM NBTV is an analog technique, in fact it is a true Fuzzy design as well. The transmission technique used is quite different from conventional TV | 3 Hz β 30 MHz | SSB | Analog OFDM | 2 kHz | Worldwide | null | null |
OPERA Beacon and Data | OPERA Ad-Hoc Data/Beacon. The system is unique in that utilizes a serial data stream and Manchester coding, its therefore impossible to lose lock and its extremely robust in disturbed paths and heavy static. | 136 kHz β 10,000 MHz | USB | ASK | 1 Hz | Worldwide | null | null |
Olivia | OLIVIA is an amateur digital teletype mode designed by Pawel Jalocha SP9VRC in 2005. Its goal was to be effective even in poor propagation conditions. | 3 MHz β 30 MHz | USB | MFSK | 125 Hz β 2 kHz | Worldwide | null | null |
One Beep, Two Beeps | One Beep, Two Beeps is a nickname given to a signal emitted by the Norwegian Navy communications center in BodΓΈ | 4.5 MHz β 6.429 MHz | USB | null | null | Norway | null | null |
OpenSky | OpenSky is an encrypted TDMA protocol that is heavily used but is being phased out by the Pennsylvania State Police. No one other than the intended user has been able to decrypt the signal. | 700 MHz β 1,000 MHz | NFM | TDMA | 20.07 kHz | Worldwide | null | null |
Orbcomm | Orbcomm satellites are used for monitoring and sending short text messages. | 137 MHz β 150 MHz | NFM | SDPSK | 15 kHz | Worldwide | null | null |
PACKET | Packet, also known as FSK300, AFSK1200, BPSK300, QPSK600, BPSK1200, QPSK2400, AX.25 and IL2P, is a packet based protocol derived from X.25 and HDLC computer network protocols. Packet radio is a synchronous system in which data is transmitted in frames. | 3 MHz β 800 MHz | USB | FSK | 730 Hz | Worldwide | null | null |
PACTOR I | PACTOR-I is a digital data protocol combining elements of PACKET and AMTOR ARQ. | 3 MHz β 30 MHz | USB | FSK | 300 Hz | Worldwide | null | null |
PACTOR II | PACTOR II is an advancement of PACTOR I. It is up to 8 times faster than PACTOR I. | 3 MHz β 30 MHz | USB | PSK | 450 Hz | Worldwide | null | null |
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. | 3 MHz β 30 MHz | USB | PSK | 400 Hz β 2.4 kHz | Worldwide | null | null |
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. | 3 MHz β 30 MHz | USB | PSK, QAM | 300 Hz β 2.4 kHz | Worldwide | null | null |
PLUTO II OTH Radar | PLUTO II is an Over The Horizon Radar located in the Sovereign Base Area just outside RAF Akrotiri in Cyprus. PLUTO II is very active in Europe. | 8 MHz β 38 MHz | USB | FMCW | 20 kHz β 40 kHz | Cyprus | null | null |
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 bps. | 25 MHz β 932 MHz | NFM | FSK | 9 kHz | Worldwide | null | null |
PSK Paging link | Also known as PSK paging, is a signal that allows side-by-side PSK to exist in AFSK paging links, allowing for more dynamically processed DSP available. | 150 MHz β 470 MHz | FM | PSK | 12.5 kHz | United States | null | null |
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 MHz β 30 MHz | USB | PSK | 3 kHz | Worldwide | null | null |
Phase Shift Keying (PSK) | PSK is a digital teletype mode based on Phase-Shift Keying (PSK) modulation. The most popular amateur radio PSK mode is PSK 31. | 1.838 MHz β 909 MHz | USB | PSK | 10 Hz β 1 kHz | Worldwide | null | null |
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. | 4 MHz β 20 MHz | USB | FSK | 3.5 kHz | Poland | null | null |
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 MHz | RAW | null | 20 kHz | United States | null | null |
Primary Aeronautical Surveillance Radar | A Primary radar (PSR Primary Surveillance Radar) is a conventional radar sensor that illuminates a large portion of space with an electromagnetic wave and receives back the reflected waves from targets within that space. | 1,215 MHz β 1,400 MHz | RAW | Pulse | 3 MHz | Worldwide | null | null |
Primex Wireless Time Sync | Primex Wireless Time Sync is a VHF Time Synchronization signal used in Primex Wireless's XR Series. | 72.02 MHz β 72.98 MHz | NFM | PSK | 20 kHz | Worldwide | null | null |
ProVoice | ProVoice is a digital voice mode used in EDACS trunked systems. | 160 MHz β 941 MHz | NFM | GFSK | null | Worldwide | null | null |
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 MHz β 859 MHz | NFM | PSK, C4FM, TDMA | 12.5 kHz | Worldwide | null | null |
QO-100-modem | High speed modem for qo-100 amateur satellite narrow transponder. | 10,489.5 MHz β 10,490 MHz | USB | QPSK, BPSK, APSK | 2.7 kHz | null | null | null |
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 MHz β 935 MHz | FHSS-TDM | BPSK, QAM, 8PSK | null | Worldwide | No Audio File | null |
RBU | RBU is a time code radio station located in Moscow. It transmits a continuous 10 kW time code on 66.66 kHz. | 66.66 kHz | USB | FSK | 650 Hz | Russia | null | null |
RDL | RDL is a Russian VLF station located in Krasnodar. It is one of the few VLF stations that changes modes during routine transmissions. | 18.1 kHz | CW | FSK, CW-FSK | null | Russia | null | null |
ROS | ROS is an amateur radio teletype free running QSO mode designed for low signal/high noise conditions. | 1.8 MHz β 30 MHz | USB | DSSS | 2 kHz | Worldwide | null | null |
RWM | RWM is a Russian shortwave time signal station. | 4.996 MHz β 14.996 MHz | USB | OOK | 5 Hz | Russia | null | null |
Radio Data Link Access Procedure (RD-LAP) | Motorola's Radio Data Link Access Procedure (RD-LAP) is a 1G protocol that was used in ARDIS and DataTAC Networks, and is still used in some MDT's, as well as gas companies, police departments, fire departments, financial companies, etc. | 150 MHz β 850 MHz | NFM | 4FSK | 12.5 kHz β 25 kHz | Worldwide | null | null |
Radio Data System (RDS) | Radio Data System (RDS) and its North American variant, Radio Broadcast Data System (RBDS), are data modes transmitted on subcarriers of commercial FM radio station transmissions. | 65 MHz β 108 MHz | DSB | PSK | 4 kHz | Worldwide | null | null |
Radio Teletype (RTTY) | RTTY (Also known as Baudot or ITA2) uses the Baudot 5-bit alphabet with FSK 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 kHz β 28.15 MHz | USB | FSK | 85 Hz β 850 Hz | Worldwide | null | null |
Radioteknicheskaya Systema Dalyoloiy Navigatsii (RSDN-20) | Russian Hyperbolic Radio Navigation System. Presumed to be used for Russian submarines and aircraft in the northern hemisphere, possibly worldwide. | 11.91 kHz β 14.88 kHz | CW | null | 20 Hz | Russia | null | null |
ReFLEX | ReFLEX is a two-way paging variant of FLEX. | 896 MHz β 941 MHz | NFM | FFSK | 40 kHz | United States | null | null |
Relocatable Over-the-Horizon Radar (ROTHR) | Relocatable Over-the-Horizon Radar (ROTHR), also known as AN/TPS-71, is an OTH Radar used by the United States Navy that uses bistatic ionospheric backscattering for wide area surveillance. | 5 MHz β 28 MHz | USB | FMCW | 4 kHz β 100 kHz | United States | null | null |
Robust PACKET | Robust PACKET, also known as HF-APRS, RPR, Winlink RMS, and APRSlink, is an OFDM 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 MHz β 14.103 MHz | USB | PSK, OFDM | 500 Hz | Worldwide | null | null |
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. | 4 MHz β 23 MHz | USB | FSK | 1 kHz | Russia | null | null |
Russian overhead power line telemetry system | Russian telemetry system, transmitted over the overhead power lines. | 50 kHz β 1 MHz | USB | FSK | 400 Hz | Russia | null | null |
S-Band Jammer | This is what the signal of a military S-Band (In this case 2.4 GHz) RADAR and WiFi intentional interference (Jamming) device looks like. This signal is generated by a DDS system and is then used to modulate the output of a 2.45 GHz magnetron (The same as in a microwave oven). | 2,400 MHz | null | Noise | 100 kHz β 100 MHz | Worldwide | β | null |
SAS/SRC | Swedish navy transmitter for submarine communication. It shares the antenna with SAQ (Grimeton Radio) | 40.4 kHz | null | MSK | null | Sweden | null | null |
SAS2 | Swedish navy transmitter for submarine communication. It shares the antenna with SAQ (Grimeton Radio) and is activated less often as the other Swedish transmitters used for VLF submarine communication. Usually, it works with reduced power. | 42.5 kHz | null | MSK | null | Sweden | null | null |
SAS3 | Swedish navy transmitter for submarine communication. It shares the antenna with SAQ (Grimeton Radio). | 44.2 kHz | null | MSK | null | Sweden | null | null |
SHR | Swedish navy transmitter for submarine communication. It shares the antenna with SAQ (Grimeton Radio). | 38 kHz | null | MSK | null | Sweden | null | null |
SITOR-A | SITOR-A (Also known as AMTOR-A) is one of two modes of SITOR, which stands for Simplex Teletype Over Radio. | 3 MHz β 30 MHz | USB | FSK | 350 Hz | Worldwide | null | null |
SITOR-B | SITOR-B is one of two modes of SITOR (Simplex Teletype Over Radio). | 3 MHz β 30 MHz | USB | FSK | 350 Hz | Worldwide | null | null |
SNOTEL (Snow Telemetry) | SNOTEL stations are a set of precipitation and other sensors spread across the mountains of the United States by the Department of Agriculture through the National Resources Conservation Service. | 40.67 MHz | NFM | PSK | 9 kHz | United States | null | null |
SNOTEL (Snow Telemetry) | SNOTEL stations are a set of precipitation and other sensors spread across the mountains of the United States by the Department of Agriculture through the National Resources Conservation Service. | 40.67 MHz | NFM | PSK | 9 kHz | United States | null | null |
STANAG 4197 | STANAG 4197 is a NATO QPSK OFDM signal used in ANDVT modems that transmit encrypted digital voice over HF. | 3 MHz β 30 MHz | USB | PSK, OFDM | 2.3 kHz | Worldwide | null | null |
STANAG 4285 | STANAG 4285 is specified by the NATO (North Atlantic Treaty Organization) Military Agency for Standardization in "Characteristics of 1200 / 2400 / 3600 Bits per Second Single Tone Modulators / Demodulators for HF Radio Links" | 1.89 MHz β 22.7 MHz | USB | PSK | 2.75 kHz | Worldwide | null | null |
STANAG 4481 | STANAG 4481, also known as CRATT, Link-4, and NATO-75, is specified by the NATO (North Atlantic Treaty Organization) Military Agency for Standardization as a "Minimum technical equipment standards for naval HF shore-to-ship broadcast system" | 2.815 MHz β 18.016 MHz | USB | FSK, PSK | 1.5 kHz β 2.75 kHz | Worldwide | null | null |
STANAG 5065 | STANAG 5065 is defined as "Minimum Standards for Naval Low Frequency (LF) Shore-To-Ship Surface Broadcast Systems", with two primary protocols, FSK75 and MSK300. | 50 kHz β 160 kHz | USB | FSK, MSK | 235 Hz β 360 Hz | Worldwide | null | null |
STP403 Bus PIT System | STP403 is a bus PIT system used to update digital displays at bus stops. STP403 was developed by French companies INEO and CESATEC. | 164 MHz β 468.488 MHz | NFM | FFSK | 8 kHz | France | null | null |
Saab Grintek MHF-50 MFSK Modem | The MHF-50 MFSK Modem by Saab Grintek Technologies in South Africa is a data modem that utilizes RTTY, 2-FSK, and 33-MFSK to transmit data | 4.245 MHz β 12.982 MHz | USB | MFSK, FSK | 2.2 kHz | South Africa | null | null |
Secondary surveillance radar (SSR) | Secondary surveillance radar (SSR)is a radar system used in air traffic control. A surveillance radar system which uses transmitters/receivers (interrogators) and transponders. | 1,030 MHz | RAW | PPM | 3 MHz | Worldwide | null | null |
Sensus Water meter (Acquisition units) | These are samples from the Sensus Water meters. They are a FHSS ASK encoded data transmission for purposes of providing municipalities water meter telemetry (for billing how much water you use). | 902 MHz β 927 MHz | null | ASK, FHSS | 175 MHz | Worldwide | β | null |
Serdolik | Serdolik is a MFSK signal used by the Russian diplomatic service. | 3 MHz β 30 MHz | USB | MFSK | 1.4 kHz | Russia | null | null |
Siemens 1.5T MRI Scanner | Radio signal used by MRI machines to excite protons and obtain their response. | 64 MHz | null | null | null | Worldwide | null | null |
Siemens CHX-200 FSK Modem | CHX200, also known as Siemens CHP200 and PRC-921/GY, is a backpack HF ECCOM transceiver, designed and built by Siemens. | 1.5 MHz β 30 MHz | USB | FSK | 300 Hz | Worldwide | null | null |
Single Sideband Voice | Single-sideband voice is a subtype of AM voice modulation. It is used in HF amateur bands and for weak signal VHF and UHF voice, as well as aircraft weather reports. | 3 MHz β 30 MHz | SSB | AM | 1.9 kHz | Worldwide | null | null |
Single frequency russian overhead power line telemetry system | Russian telemetry system, transmitted over the overhead power lines. | 50 kHz β 1 MHz | SSB | AM | 300 Hz | Russia | null | null |
SiriusXM Satellite Radio | SiriusXM Satellite Radio: Terrestrial Repeater Signal | 2,332.5 MHz β 2,345 MHz | RAW | OFDM, PSK | 12.5 MHz | United States | null | null |
SkyOFDM | Data transmission mode developed by SkySweep Technologies in Finland. Probably used by Finnish MFA | 3 MHz β 30 MHz | USB | PSK, OFDM | 2 kHz β 2.4 kHz | Finland | null | null |
Slow-Scan Television (SSTV) | Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images. | 3 MHz β 450 MHz | USB, LSB, NFM | FM | 2.5 kHz | Worldwide | null | null |
Snap Circuits SCROV-10 Remote Control | A remote control transmission from the controller from an Elenco Snap Circuits SCROV-10 kit. | 27.145 MHz | RAW | ASK | 6 kHz | null | null | null |
Soyuz-MS spacecraft telemetry | PCM-FM Soyuz-MS spacecraft telemetry. | 166 MHz | USB | PCM, FM | 250 kHz | Worldwide | null | null |
SuperDARN (Super Dual Auroral Radar Network) | SuperDARN (Super Dual Auroral Radar Network) is an international radar network used for scientific purposes. The network is used to study plasma convection in the upper atmosphere. | 8 MHz β 20 MHz | USB | null | 6 kHz | Worldwide | null | null |
Supervisory Control And Data Acquisition (SCADA) | Supervisory Control And Data Acquisition (SCADA) is a control system architecture that is used in industrial applications for computerized automated systems. Wireless telemetry is used on RTU's to send data to control units for operators to utilize. | 413 MHz β 950 MHz | FM | FSK | 12 kHz | null | null | null |
Switch-mode power supply interference | Switch-mode power supplies, used in many types of electronic devices, can generate RF noise on wide frequency ranges. | 10 kHz β 200 MHz | USB | null | null | Worldwide | null | null |
T-230-1A 'Mahovik' | Mahovik, "Flywheel" in Russian, is a PSK based mode that can transmit both voice and data. It is transmitted from a Russian T-230-1A radio transceiver. | 3 MHz β 30 MHz | USB | PSK | 2.5 kHz | Russia | null | null |
TDF | TDF is a time signal transmitted on the former carrier of France's France Inter longwave AM radio station on 162 kHz. | 162 kHz | USB | PSK | 1 Hz | France | null | null |
Tactical Air Navigation System (TACAN) | Radio navigation technology that measures the slant range (distance) between an aircraft and a ground station by timing the propagation delay of radio signals. | 960 MHz β 1,213 MHz | null | null | null | Worldwide | null | null |
Terrestrial Trunked Radio (TETRA) | TETRA is a professional mobile radio and two-way transceiver (walkie-talkie) specification | 380 MHz β 430 MHz | NFM | PSK | 25 kHz | Worldwide | null | null |
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 MHz β 400 MHz | NFM | GMSK | 10 kHz β 12.5 kHz | Europe | null | null |
Thales SystΓ¨me 3000 HF Modem | Thales SystΓ¨me 3000 is a HF modem capable of many different modes of transmission. It has a unique preamble and format to it's signals. | 1.5 MHz β 30 MHz | USB | PSK, MFSK | 2 kHz β 3 kHz | Worldwide | null | null |
The Alarm | Channel marker of a Russian military station nicknamed "The Alarm". "The Alarm" is a Russian military commandment network serving the Western Military District. So far, apart from test counts, it has not been heard with any actual traffic. | 4.77 MHz | USB | null | 2.4 kHz | Russia | null | null |
The Buzzer (ZhUOZ MDZhB UZB76) | The Buzzer, call-sign NZhTI (formerly ANVF, ZhUOZ, MDZhB and UZB-76), is a Russian Military Commandment system signal used to broadcast diplomatic ciphered messages known as "monolit" to the russian navy. If there is no message to broadcast, its "homing" signal is a loud ship-horn buzzing sound. It is believed to serve a similar purposes to The Alarm and The Air Horn. | 4.625 MHz β 6.998 MHz | AM | USB | 2.8 kHz | Russia | null | null |
The Goose | Channel marker of the Russian military station nicknamed "The Goose", for its distinct channel marker sound. Uses 3243 kHz in nighttime, and 4310kHz in daytime. | 3.243 MHz β 4.31 MHz | USB | AM | 3.1 kHz | Russia | null | null |
The Pip | The Pip is the nickname given by radio listeners to a shortwave radio station that broadcasts on the frequency 5448 kHz by day, and 3756 kHz during the night. It broadcasts short, repeated beeps at a rate of around 50 per minute, for 24 hours per day. The beep signal is occasionally interrupted by voice messages in Russian. The Pip has been active since around 1986 when its distinctive beeping sound was first recorded by listeners. While its official name or callsign is not known, some of the voice transmissions begin with the code 8S1Shch (Cyrillic: 8Π‘1Π©), which is generally considered to be the name of the station. However, this code may not be a callsign, but instead, serve some other purpose. Radioscanner.ru identifies the owner of this station as a North-Caucasian military district communication center with callsign "Akacia" (ex-72nd communication center, Russian "72 ΡΠ·Π΅Π» ΡΠ²ΡΠ·ΠΈ ΡΡΠ°Π±Π° Π‘ΠΠΠ") | 3.756 MHz β 5.448 MHz | USB,AM | null | null | Russia | null | null |
Tire Pressure Monitoring System (TPMS) | TPMS (Tire-Pressure Monitoring System), more specifically Direct TPMS (dTPMS), is a system that uses pressure sensors to monitor tire pressure on vehicles. | 315 MHz β 434 MHz | AM | FSK | 100 kHz | Worldwide | null | null |
Toyota Car Key | Wireless entry rolling code car key. | 315 MHz β 433 MHz | AM | null | 40 kHz | Worldwide | null | null |
Transit 5B-5 | Transit 5B-5, a former TRANSIT navigation satellite, is the oldest satellite known to still transmit a signal. Considered "dead" because its navigational systems failed after 19 days of operation, it still emits a telemetry signal when illuminated. | 136.658 MHz | WFM | PCM, PAM, FM, PM | 32 kHz | Worldwide | null | null |
UK AM Data System (UK-AMDS) | UK AM 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 LF AM carrier. Elements of this system were adopted into ETSI's AMSS. | 198 kHz | SSB | AM, PSK | 85 Hz | United Kingdom | null | null |
UK GOV MIL WINDRM51 | UK GOV/MIL "WinDRM51" variant. Unknown purpose, But link between UK & Cyprus has been found some years ago. | 9.104 MHz β 13.451 MHz | USB | OFDM | 2.5 kHz | Europe | null | null |
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 MHz β 25 MHz | AM | null | 4 kHz | United States | null | null |
Ultra Low Latency (ULL) Electronic Trading Network | A 48k or 24k baud OQPSK signal that is strongly suspected (through numerous circumstancial pieces of evidence) to be either an experimental or active P2P RF link between financial market data centers, used for High Frequency Trading (HFT) and other latency-sensitive market activities. | 6 MHz β 20 MHz | RAW | OQPSK | 30 kHz β 60 kHz | United States | null | null |
VARA HF | VARA HF is a sound-card mode used to exchange traffic (Mostly Winlink traffic) on the HF bands | 1.8 MHz β 54 MHz | USB | BPSK, 4-8PSK, 16-32QAM, FSK | 2.75 kHz | Worldwide | null | null |
VEZHA-S | Two-way 100 Bd/500 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 MHz β 12.165 MHz | USB | FSK | 650 Hz | Russia | null | null |
VHF Data Link - Mode 2 (VDL-M2) | VDL-M2 (Known as VDL2 or VDLM2) is a means of sending information between aircraft and ground stations. VDL Mode 2 is the only VDL mode being implemented operationally to support Controller Pilot Data Link Communications (CPDLC). An extension to the AVLC protocol permits ACARS over AVLC (AOA) transmissions. VDL-M2 is implemented by Eurocontrol. | 117.975 MHz β 137 MHz | RAW | PSK | 25 kHz | Worldwide | null | null |