Radio linked electromechanical communications system
For broader coverage of this topic, see Wireless telegraphy.
Radioteletype tuning indicatorTuning indicator on cathode ray tube
Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected by radio rather than a wired link. Radioteletype evolved from earlier landline teleprinter operations that began in the mid-1800s.[1] The US Navy Department successfully tested printing telegraphy between an airplane and ground radio station in 1922. Later that year, the Radio Corporation of America successfully tested printing telegraphy via their Chatham, Massachusetts, radio station to the R.M.S. Majestic. Commercial RTTY systems were in active service between San Francisco and Honolulu as early as April 1932 and between San Francisco and New York City by 1934. The US military used radioteletype in the 1930s and expanded this usage during World War II. From the 1980s, teleprinters were replaced by personal computers (PCs) running software to emulate teleprinters.
The term radioteletype is used to describe both the original radioteletype system, sometimes described as "Baudot", as well as the entire family of systems connecting two or more teleprinters or PCs using software to emulate teleprinters, over radio, regardless of alphabet, link system or modulation.
In some applications, notably military and government, radioteletype is known by the acronym RATT (Radio Automatic Teletype).[2]
^"Illustrations of Telegraph Instruments". p. 28.
^"MOD Acronyms and Abbreviations" (PDF). UK Ministry of Defence. Retrieved 12 October 2010.
Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected...
also BPSK31 and QPSK31, is a popular computer-sound card-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time...
(FSK) was used mainly by radioteletype networks (RTTY). Morse code radiotelegraphy was gradually replaced by radioteletype in most high volume applications...
overseas) radiotelephony and radioteletype by shortwave (HF). In military use, ISB usually referred to a close pair of FSK radioteletype channels which could...
systems, garage door openers, and other low-frequency transmissions. Radioteletype also uses FSK. Frequency modulation is widely used for FM radio broadcasting...
"TeleTYpewriter", and is also known as Teleprinter or Teletype. RTTY stands for Radioteletype; character sets such as Baudot code, which predated ASCII, were used...
Hamburg. Near Pinneberg is the transmission site for the maritime weather radioteletype and radiofax service DDH47, working on 147.3 kHz. A T-aerial is used...
came into routine use in February 1943 and the SZ42B in June 1944. Radioteletype (RTTY) rather than land-line circuits was used for this traffic. These...
paper tape and transmit them without pauses for typing. Leased line and radioteletype networks arranged in point-to-point and / or multipoint configurations...
personal computers have encouraged the use of digital modes such as radioteletype (RTTY) which previously required cumbersome mechanical equipment. Hams...
the deaf (TDD), Telex, and some amateur radio applications, such as radioteletype ("RTTY"). ITA2 is also used in Enhanced Broadcast Solution, an early...
other forms of communication, such as slow-scan television (SSTV), and radioteletype (RTTY). Additionally, amateurs are among the only radio operators still...
communicating in computer messaging, radiotelephony, radiotelegraph, radioteletype (RATT), air-to-ground signalling (panel signalling), and other forms...
utility on the modem itself. Shortwave Radioteletype Winmor Helfert, Hans-Peter (October 1991). "PACTOR—Radioteletype with Memory ARQ and Data Compression"...
centers. Some long distance and international links were based on duplex radioteletype transmissions and leased lines. When it upgraded to CIDIN (Common ICAO...
developed in the 1960s by Koninklijke TNT Post as an improvement over radioteletype (RTTY). Although it uses the same frequency-shift keying (FSK) modulation...
to numbers station signals has revealed the presence of data bursts, radioteletype-modulated subcarriers, phase-shifted carriers, and other unusual transmitter...
separately. It is typically received via lower or upper SSB modes. Radioteletype, fax, digital, slow-scan television, and other systems use forms of...
organized system of amateur radio networks. After World War II, voice and radioteletype implementations of the message relay system were employed. Post rider...
amateurs use a variety of transmission modes, including Morse code, radioteletype, data, and voice. Specific frequency allocations vary from country to...
was known as the R-388 and was used in multiple receiver diversity radioteletype installations. The 75A amateur line was updated throughout the early...
Morse code B Electronic telegraphy, intended to be decoded by machine (radioteletype and digital modes) C Facsimile (still images) D Data transmission, telemetry...
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