Very Low Frequency (VLF) |
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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) StatusUnknown or Intermittent Signal Name Description Frequency Mode Modulation Bandwidth Location Sample Audio Waterfall image GYN2 GBR Transmitting site owned by the Ministry of Defense. Originally constructed in 1946 and was originally used as a shortwave radio station. In present time, the transmitting site is used by the British Navy in order to transmit encrypted messages to submarines at sea. The site is also capable of DRM and is beamed at 121°, towards Germany and Central Europe 81 kHzKiloHertz (kHz) 10^3 Hz United Kingdom Grimeton Radio (SAQ) UNESCO World Heritage transmitter, using an Alexanderson alternator for rf generation 17.2 kHzKiloHertz (kHz) 10^3 Hz — 40.4 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave Sweden ICV ICV is a NATONorth Atlantic Treaty Organization-operated VLFVery Low Frequency (3-30 kHz) transmitted located in the island of Tavolara, Sardinia, Italy. 20.27 kHzKiloHertz (kHz) 10^3 Hz — 20.76 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave 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.) Italy Jim Creek (NLK) Jim Creek Naval Radio Station is used by the US Navy to transmit commands to distant submarines. 24.8 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave 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.) 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). United States Lightning Sferics VLFVery Low Frequency (3-30 kHz) RFRadio Frequency emissions from lightning in the atmosphere that can affect up to HFHigh Frequency (3-30 MHz) frequencies and beyond depending on strength. Has a popping crackle sound with both USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) and AMAmplitude Modulation modes of reception. 0 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 30 MHzMegaHertz (MHz) 10^6 Hz Worldwide NML Naval Radio Transmitter Facility (NRTF) transmits encrypted commands to submerged US submarines. 25.2 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave FSKFrequency-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). United States 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 2½-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 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave Worldwide NPM Naval Radio Transmitting Facility (NRTF) sends encrypted commands to submerged US naval submarines in the Pacific. 21.4 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave FSKFrequency-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). United States 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 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave FSKFrequency-Shift Keying 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Australia RDL RDL is a Russian VLFVery Low Frequency (3-30 kHz) station located in Krasnodar. It is one of the few VLFVery Low Frequency (3-30 kHz) stations that changes modes during routine transmissions. 18.1 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave FSKFrequency-Shift Keying, CWContinuous Wave-FSKFrequency-Shift Keying Russia 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 SAS/SRC Swedish navy transmitter for submarine communication 40.4 kHzKiloHertz (kHz) 10^3 Hz 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.) Sweden SAS2 Swedish navy transmitter for submarine communication 42.5 kHzKiloHertz (kHz) 10^3 Hz 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.) Sweden SAS3 Swedish navy transmitter for submarine communication 44.2 kHzKiloHertz (kHz) 10^3 Hz 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.) Sweden SHR 38 kHzKiloHertz (kHz) 10^3 Hz 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.) Sweden Pages in category "VLF"The following 17 pages are in this category, out of 17 total. G Grimeton Radio (SAQ) GYN2 GBRI ICVJ Jim Creek (NLK)L Lightning SfericsN NML N cont. NOV NPM NWCR Radioteknicheskaya Systema Dalyoloiy Navigatsii (RSDN-20) RDLS SAS/SRC S cont. SAS2 SAS3 SHRU Unkown 0p012V VLF |
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