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Click the name of a signal to see more detailed information, possible decoding, and additional sound and waterfall samples

Color Legend
Inactive
(No longer in use)
Active
(Currently in active use)
Status
Unknown or Intermittent
Signal Name Description Frequency Mode Modulation Bandwidth Location Sample Audio Waterfall image
'Vario' Airplane Data Controller This transmitter is found within the UHFUltra High Frequency (300-3000 MHz) FMRS bands, most likely used at airshows to give off barometric pressure, height in altitude represented by a voice, including various tones representing how high/how low the model plane is in the air. 462.61 MHzMegaHertz (MHz) 10^6 Hz — 462.725 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Voice and Data kHzKiloHertz (kHz) 10^3 Hz United States Altitude.jpg
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
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
Eurobalise downlink Downlink from train to balise 27.095 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation Europe Eurobalise.jpg
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 MHzMegaHertz (MHz) 10^6 Hz — 1,575.42 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), QAMQuadrature Amplitude Modulation, DSSS, BOC, TMBOC 22 MHzMegaHertz (MHz) 10^6 Hz — 25 MHzMegaHertz (MHz) 10^6 Hz Worldwide GPS.png
Ground-Based Augmentation System (GBAS) GBAS is an advanced aircraft navigation system that provides GPS corrections to aircraft on approach. 108 MHzMegaHertz (MHz) 10^6 Hz — 117.975 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation D8PSK 15 kHzKiloHertz (kHz) 10^3 Hz Worldwide YMML GBAS WF.mp3.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
Instrument Landing System Radio navigation system that allows aircraft to perform precision approaches in low visibility conditions. 108 MHzMegaHertz (MHz) 10^6 Hz — 335 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation 15 kHzKiloHertz (kHz) 10^3 Hz Worldwide Ils waterfall.png
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 MHzMegaHertz (MHz) 10^6 Hz — 470 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation FSKFrequency-Shift Keying 7.49 kHzKiloHertz (kHz) 10^3 Hz Worldwide GPS RTK.PNG
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
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 CWContinuous Wave A2A (AMAmplitude Modulation) kHzKiloHertz (kHz) 10^3 Hz Worldwide Ndb-pes.jpg
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 MHzMegaHertz (MHz) 10^6 Hz — 1,400 MHzMegaHertz (MHz) 10^6 Hz RAW Pulse MHzMegaHertz (MHz) 10^6 Hz Worldwide L-band radar.JPG
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 kHzKiloHertz (kHz) 10^3 Hz — 14.88 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave 20 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Russia Rsdn.PNG
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 MHzMegaHertz (MHz) 10^6 Hz RAW PPMPulse Position Modulation MHzMegaHertz (MHz) 10^6 Hz Worldwide Interrogator.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
Tactical Air Navigation System (TACAN) Radio navigation technology that measures the slant range (distance) between an aircraft and a ground station 960 MHzMegaHertz (MHz) 10^6 Hz — 1,213 MHzMegaHertz (MHz) 10^6 Hz Worldwide TACAN.png
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 MHzMegaHertz (MHz) 10^6 Hz WFMWideband Frequency Modulation PCM, PAMPulse Amplitude Modulation, FMFrequency Modulation, PM 32 kHzKiloHertz (kHz) 10^3 Hz Worldwide Transit 5B-5Waterfall.png
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