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

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
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
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
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
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
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