Digital Sounds

The following examples of Digital signals are provided by WUN to help you identify the Utility signals you hear on shortwave. For more information on digital signals on HF, please read the Digital Signals FAQ. Additional sound samples can be found on the WUN CD-ROM Volume II and on the Signals HF monitoring site.

	180k		ACARS : Aircraft Communications Addressing and Reporting System
	100k		ALE : Automatic Link Establishment - MIL-STD-188-141A
	204k		ANDVT : Advanced Narrowband Digital Voice Terminal (US govt/mil)
	166k		ARQ-M2 : ARQ-M2 (Moore Code)
	119k		ARQ-E3 : ARQ-E3 200 baud idling
	142k		CLOVER : Amateur CLOVER
	186k		DCF77 : Time Station Signal
	330k		DECCA : HF Radio Navigation System
	226k		DGPS-MSK : Differential GPS, Minimum Shift Keying
	269k		DGPS-QPSK : Differential GPS, Quarternary Phase Shift Keying
	29k		GMDSS : GMDSS Marine SELCAL System (4125 KHz)
	114k		GWEN : Ground Wave Emergency Network (149KHz)
	173k		HYPER-FIX : Hyperbolic Radio Navigation System
	154k		ICAO-SELCAL : ICAO Aeronautical SELCAL
	164k		LINK11 : Link-11 Network (NATO mil)
	169k		LORAN-C : Long Range Radio Navigation System
	173k		MORSE : Morse Code
	186k		NDB : Non-Directional Beacon
	144k		OTHR : Over-The-Horizon Radar (probably US mil)
	205k		PACTOR : PACTOR 200 baud
	296k		PACKET : PACKET (AX.25) 300 Baud
	34k		RAC-ARQ : Rac-Arq/Merod
	174k		RTTY : Radioteletype (Baudot 50 baud)
	62k		SELSCAN : SELSCAN Link Availability Sounder (US govt)
	261k		SITOR-A : Telex-Over-Radio
	156k		SITOR-A MKR : Telex-Over-Radio Idle Marker
	369k		SITOR-B : Telex-Over-Radio (broadcast)
	107k		SSTV : Amateur Slow-Scan TV (Martin-1)
	282k		SWED-ARQ : Swedish ARQ
	228k		VFT : Voice Frequency Telegraphy RTTY
	132k		VFT-USAF : Voice Frequency Telegraphy data mux (USAF)
	265k		WEFAX : Weather Facimile