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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
(No longer in use)
(Currently in active use)
Unknown or Intermittent
Signal Name Description Frequency Mode Modulation Bandwidth Location Sample Audio Waterfall image
Adam H Image Capable Digital Mode (AHICDM) AHICDM is a simple, slow and reliable modulation protocol that allows binary data in standard ASCII to be sent over audio. Digital Custom United Kingdom AHICDM.png
Adam H Secure Communication (AHSC) AHSC uses a randomly generated One-Time-Pad to secure communications between transmitter and receiver. Used for unscheduled transferring of data due to the architecture of the protocol / mode which makes decoding the message impossible if the transmission was not listened to from the beginning. USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) United Kingdom AHSC.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
PSK Paging link Also known as PSKPhase-Shift Keying paging, is a one of a kind signal that allows side-by-side PSKPhase-Shift Keying to exist under extreme conditions in AFSKAudio Frequency-Shift Keying paging links, allowing for more dynamically processed DSP available. 150 MHzMegaHertz (MHz) 10^6 Hz — 470 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation PSKPhase-Shift Keying 12.5 kHzKiloHertz (kHz) 10^3 Hz United States Purc signaling.png
Radio Telephone Network C (C-Netz) The Radio Telephone Network C (German: Funktelefonnetz-C, abbreviated as C-Netz), was a first generation analog cellular phone system deployed and operated in Germany (at first West Germany) by DeTeMobil (formerly of Deutsche Bundespost Telekom, currently Deutsche Telekom). 450 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation FSKFrequency-Shift Keying 12.5 kHzKiloHertz (kHz) 10^3 Hz Germany Cnetz2.png
UHF Vehicle Location System LTR Passport is a type of control channel (unlike the standalone LTR that doesnt have one) which consists of multiple radio repeater sites linked together to form a wide-area radio dispatch network. 400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 900 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying 5.5 kHzKiloHertz (kHz) 10^3 Hz United States Unk data link .jpg