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32 relations: ACARS, Amateur radio operator, Bandwidth (signal processing), CLOVER2000, Dot matrix printing, Encryption, Enigma machine, Fast Fourier transform, Fax, Frequency modulation, Hertz, Minimum-shift keying, MT63, Multiple frequency-shift keying, Navtex, Ogg, Olivia MFSK, PACTOR, Phase (waves), Phase-shift keying, Pixel, PSK31, PSK63, Q15X25, Rudolf Hell, Sailmail, SITOR, Teleprinter, Typewriter, United States, Wehrmacht, X.25.
ACARS
In aviation, ACARS (an acronym for aircraft communications addressing and reporting system) is a digital datalink system for transmission of short messages between aircraft and ground stations via airband radio or satellite.
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Amateur radio operator
An amateur radio operator is someone who uses equipment at an amateur radio station to engage in two-way personal communications with other amateur operators on radio frequencies assigned to the amateur radio service.
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Bandwidth (signal processing)
Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies.
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CLOVER2000
CLOVER is the name of a series or class of modem modulation techniques (“waveforms”) specifically designed for use over high frequency (HF) radio systems.
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Dot matrix printing
Dot matrix printing is the process of computer printing from a collection of dot matrix data to a device, which can be one of.
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Encryption
In cryptography, encryption is the process of encoding a message or information in such a way that only authorized parties can access it and those who are not authorized cannot.
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Enigma machine
The Enigma machines were a series of electro-mechanical rotor cipher machines developed and used in the early- to mid-20th century to protect commercial, diplomatic and military communication.
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Fast Fourier transform
A fast Fourier transform (FFT) is an algorithm that samples a signal over a period of time (or space) and divides it into its frequency components.
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Fax
Fax (short for facsimile), sometimes called telecopying or telefax (the latter short for telefacsimile), is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other output device.
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Frequency modulation
In telecommunications and signal processing, frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave.
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Hertz
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
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Minimum-shift keying
In digital modulation, minimum-shift keying (MSK) is a type of continuous-phase frequency-shift keying that was developed in the late 1950s and 1960s.
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MT63
MT63 is a digital radio modulation mode for transmission in high-noise situations developed by Pawel Jalocha SP9VRC.
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Multiple frequency-shift keying
Multiple frequency-shift keying (MFSK) is a variation of frequency-shift keying (FSK) that uses more than two frequencies.
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Navtex
Navtex (Navigational Telex) is an international automated medium frequency direct-printing service for delivery of navigational and meteorological warnings and forecasts, as well as urgent maritime safety information to ships.
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Ogg
Ogg is a free, open container format maintained by the Xiph.Org Foundation.
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Olivia MFSK
Olivia MFSK is an amateur radioteletype protocol, using multiple frequency-shift keying (MFSK) and designed to work in difficult (low signal-to-noise ratio plus multipath propagation) conditions on shortwave bands.
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PACTOR
PACTOR is a radio modulation mode used by amateur radio operators, marine radio stations, and radio stations in isolated areas to send and receive digital information via radio.
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Phase (waves)
Phase is the position of a point in time (an instant) on a waveform cycle.
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Phase-shift keying
Phase-shift keying (PSK) is a digital modulation process which conveys data by changing (modulating) the phase of a constant frequency reference signal (the carrier wave).
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Pixel
In digital imaging, a pixel, pel, dots, or picture element is a physical point in a raster image, or the smallest addressable element in an all points addressable display device; so it is the smallest controllable element of a picture represented on the screen.
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PSK31
PSK31 or "Phase Shift Keying, 31 Baud", also BPSK31 and QPSK31, is a popular computer-sound card-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time keyboard-to-keyboard chat, most often using frequencies in the high frequency amateur radio bands (near-shortwave).
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PSK63
PSK63 (meaning Phase Shift Keying at a rate of 63 baud) is a digital radio modulation mode used primarily in the amateur radio field to conduct real-time keyboard-to-keyboard informal text chat between amateur radio operators.
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Q15X25
Q15X25 is a communications protocol for sending data over a radio link.
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Rudolf Hell
Rudolf Hell (19 December 1901 – 11 March 2002) was a German inventor.
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Sailmail
SailMail is radio based e-mail system designed for boat owners operating beyond line-of-sight radio links to the internet.
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SITOR
SITOR (SImplex Teletype Over Radio) is a system for transmitting text messages.
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Teleprinter
A teleprinter (teletypewriter, Teletype or TTY) is an electromechanical typewriter that can be used to send and receive typed messages through various communications channels, in both point-to-point and point-to-multipoint configurations.
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Typewriter
A typewriter is a mechanical or electromechanical machine for writing characters similar to those produced by printer's movable type.
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United States
The United States of America (USA), commonly known as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.
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Wehrmacht
The Wehrmacht (lit. "defence force")From wehren, "to defend" and Macht., "power, force".
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X.25
X.25 is an ITU-T standard protocol suite for packet switched wide area network (WAN) communication.
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References
[1] https://en.wikipedia.org/wiki/Hellschreiber
