![]() This is the CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R) 242 standard version. Used in Aeronautical, Maritime, and Point-to-Point services.ĪRQ Automatic Repeat reQuest Automatic Repeat Query-M4-242 (Also known as TDM 242, TDM-4, 192-TDM, and ARQ Automatic Repeat reQuest Automatic Repeat Query-56) is a four-channel time division multiplexed telex system. This is the CCIR Comité Consultatif International pour la Radio (Predecessor of the ITU-R) 342 standard version. Used in Aeronautical, Marine, and Point-to-Point services.Ħ00 Hz Hertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).ĪRQ Automatic Repeat reQuest Automatic Repeat Query-M2-342 (Also known as TDM 342, TDM-2, 96-TDM, and ARQ Automatic Repeat reQuest Automatic Repeat Query-28) is a two-channel time division multiplexed telex system. 850 Hz Hertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).ĪRQ Automatic Repeat reQuest Automatic Repeat Query-M2-242 (Also known as TDM 242, TDM-2, 96-TDM, and ARQ Automatic Repeat reQuest Automatic Repeat Query-28) is a two-channel time division multiplexed telex system. Stations commonly idled for hours on end.ģ MHz MegaHertz (MHz) 10^6 Hz - 30 MHz MegaHertz (MHz) 10^6 HzĨ5 Hz Hertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). ARQ Automatic Repeat reQuest Automatic Repeat Query-E3 is a variant that uses a different alphabet encoding. It is adapted to the demands of amateur radio emergency traffic handling.ġ.806 MHz MegaHertz (MHz) 10^6 Hz - 144.163 MHz MegaHertz (MHz) 10^6 HzĤ00 Hz Hertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).ĪRQ Automatic Repeat reQuest Automatic Repeat Query-E, also known as ARQ Automatic Repeat reQuest Automatic Repeat Query-1000 Duplex or ARQ Automatic Repeat reQuest Automatic Repeat Query-1000D, is a synchronous full-duplex ARQ Automatic Repeat reQuest Automatic Repeat Query system. ![]() 1.2 kHz KiloHertz (kHz) 10^3 HzĪLE Automatic Link Establishment-400 is an amateur version of the 2G ALE Automatic Link Establishment standard. USB Upper Side Band Modulation (Radio, referring to reception and modulation mode) Universal Serial Bus (Computer, referring to USB Ports and cables), FM Frequency ModulationĨPSK 8-Phase Phase-Shift Keying (3 bits per symbol)ġ25 Hz Hertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). It's goal is to provide medium speed data using generic FM Frequency Modulation and SSB Single-sideband modulation radios.ģ MHz MegaHertz (MHz) 10^6 Hz - 3,000 MHz MegaHertz (MHz) 10^6 Hz USB Upper Side Band Modulation (Radio, referring to reception and modulation mode) Universal Serial Bus (Computer, referring to USB Ports and cables)ģ.5 kHz KiloHertz (kHz) 10^3 Hz - 28 kHz KiloHertz (kHz) 10^3 HzĨPSK 8-Phase Phase-Shift Keying (3 bits per symbol) is an amateur digital UTF8-text and data mode designed by John Phelps KL4YFD in 2014. It is currently very active in Europe.Ħ.1 MHz MegaHertz (MHz) 10^6 Hz - 32 MHz MegaHertz (MHz) 10^6 Hz ![]() 'Ghadir', is an Iranian over the horizon radar, part of Iran's Sepehr Phased Radar System.Ģ8 MHz MegaHertz (MHz) 10^6 Hz - 29.7 MHz MegaHertz (MHz) 10^6 HzĦ0 kHz KiloHertz (kHz) 10^3 Hz - 1 MHz MegaHertz (MHz) 10^6 HzĢ9B6, nicknamed 'Kontayner', is a Russian over the horizon radar. Click the name of a signal to see more detailed information, possible decoding, and additional sound and waterfall samples Color Legend
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