Low Frequency (LF)

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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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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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
TDF TDF is a time signal transmitted on the former 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
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