Medium Frequency (MF)

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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
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
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
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, although MIL 188-141 does not provide Fast LSU. 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
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
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-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
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
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
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
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
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 / FMCW 100 kHzKiloHertz (kHz) 10^3 Hz United States Haarp.jpg
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
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
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
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
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
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
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
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
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
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
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