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CW Skimmer is a Windows program that decodes and analyzes Morse code signals in the receiver passband. It uses Bayesian statistics, noise blanker, AGC, and CW filter, and supports network connections and DX cluster interface.
WSPR is a protocol and software for amateur radio operators to test propagation paths on MF and HF bands. It uses low-power transmissions with frequency-shift keying and sends callsign, locator and power level. WSPRnet is a database of reception reports that can be mapped.
WSJT-X is a computer program that uses digital signal processing techniques to communicate with other amateur radio operators on various bands and modes. It includes FT8, a slow mode that can decode signals many decibels below the noise floor, as well as JT9, QRA64, and other modes.
Learn about POCSAG, an asynchronous protocol used to transmit data to pagers. Find out how it works, its history, its data rates, and its message formats.
Learn the history and usage of the most widely used set of clear-code words for communicating the letters of the Roman alphabet, such as Alpha, Bravo, Charlie and Delta. The code words are also known as NATO spelling alphabet, ICAO phonetic alphabet and radiotelephony spelling alphabet.
The FEND code is then sent as FESC, TFEND and the FESC is then sent as FESC, TFESC. Two FESCs in a row are a protocol violation and can be used to signal an aborted transmission. This allows the recipient (usually the TNC) to avoid misinterpreting subsequent data as part of a valid frame.
IRLP is a system that connects amateur radio stations around the world using Voice over IP. Learn about its history, features, requirements, and how to use it with DTMF tones and reflectors.
A comprehensive list of compression formats and related codecs for audio and video, with brief descriptions and links to software implementations. Includes lossless, lossy, speech, and neural audio codecs, as well as standards and formats.