Digital Signal Audio Reference

Examples of digital signals you may hear on shortwave and other frequencies - speaker icon links to a sample audio file

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./military)
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)
548k HAARP : High-frequency Active Auroral Research Program
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 : Radio Teletype (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 Facsimile