Used to by the NOAA weather satellites to transmit satellite weather photos. Used by ships to broadcast position and vessel information. Uses 9.6 kbit GMSK modulation.ĭecoding Software: ShipPlotter, AISMon (In the Files Section of the Yahoo Group)ĭescription: NOAA Automatic Picture Transmission ( APT) signal. Used by amateur radio hams for packet radio, Automatic Packet Reporting System ( APRS) and telemetry.ĭescription: Automatic Identification System ( AIS). Trunking Control Motorola Type II Smartnetĭescription: Audio frequency-shift keying ( AFSK). Audio sample recorded in NFM mode.ĭescription: Radio trunking control channel. Only transmits during a weather balloon launch.ĭescription: Terrestrial Trunked Radio (TETRA), also know as Trans-European Trunked Radio is a professional mobile radio and two-way transceiver (walkie-talkie) specification. Weather Balloon (Radiosonde) Vaisala RS92SGPĭescription: Weather balloon (Radiosonde) telemetry data. An acronym of Post Office Code Standardization Advisory Group. Typical Frequency: ~151 MHz, ~900-950 MHzĭescription: Pager digital signal known as POCSAG. Note, only unencrypted can be decoded.ĭescription: Motorola digital voice signal known as MotoTRBO (pronouced Moto-Turbo). Typical Frequency: ~860 MHz, ~500 MHz + othersĭescription: P25 encrypted digital voice signal with C4FM modulation.ĭecoding Software: Digital Speech Decoder (DSD). P25 Phase 1 (C4FM Modulation) (Encrypted) Short messages sent to and from aircraft. ACARSĭescription: Aircraft Communications Addressing and Reporting System ( ACARS). There are also two paperback books: Technical Handbook for Radio Monitoring VHF/UHF ( PDF Excerpt) & Technical Handbook for Radio Monitoring HF ( PDF Excerpt) which have a very comprehensive list, description and images of many signals. A very nice overview video of the HF spectrum by balint can be found here. More sites with sample audio can be found at this list on. (Note I am currently backlogged with contributed signals, if I haven’t replied or added your signal yet it will be done within a month or two). If you would like to suggest a modification or contribute a sample, please send a sample, waterfall image and information about the signal to, or post in the comments. If you enable stereo mix and pass the sample audio to an appropriate decoding program the sample audio should be decodable for most samples. I will be slowly adding more to this list over time. Most of these have been received with an RTL-SDR software defined radio. Anyone can edit and improve the information on the pages on the wiki.Ī guide to help you identify some amateur and utility digital radio signals and sounds which you may find on the frequency spectrum. Please use the new Signal Identification Wiki which has many new signals. NOTE: Recent changes to WordPress seem to have broken the audio on this page. SignalsEverywhere: Decoding HF WEFAX Weather Fax with an Airspy HF+ Discovery SDR ExtIO with Decimation & Tuner Bandwidth Controls.Manual gain controls and decimation driver. Measuring Traffic Volumes with Passive Radar.SignalsEverywhere Direction Finding Tutorial.Measuring Filter Characteristics & VSWR.Performing Replay Attacks with RTL-SDR and RpiTX.QRP (FT8, JT9, WSPR etc) Monitoring Station.Decoding 433 MHz ISM Band Weather Stations.GOES 16/17 and GK-2A Weather Satellite Tutorial.
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