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Multiple frequency-shift keying

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Multiple frequency-shift keying (MFSK) is a variation of frequency-shift keying (FSK) that uses more than two frequencies. [1]

44 relations: American Radio Relay League, Amplitude modulation, Angle modulation, Aurora, Automatic link establishment, Coherence bandwidth, Coherence time, Comb filter, Constant envelope, Decibel, Delay spread, Diplomatic Wireless Service, Dual-tone multi-frequency signaling, Earth–Moon–Earth communication, Eb/N0, Fading, Forward error correction, Frequency modulation, Frequency-hopping spread spectrum, Frequency-shift keying, High frequency, In-band signaling, Institution of Electrical Engineers, Intermodulation, Intersymbol interference, Joseph Hooton Taylor Jr., Letter beacon, M-ary transmission, Multi-frequency signaling, Multipath propagation, Near vertical incidence skywave, Noisy-channel coding theorem, Olivia MFSK, OZ7IGY, Phreaking, PSK31, Radio Society of Great Britain, Radioteletype, Signal-to-noise ratio, Signaling (telecommunications), Skywave, Ultra high frequency, Very high frequency, WSJT (amateur radio software).

American Radio Relay League

The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the USA.

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Amplitude modulation

Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave.

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Angle modulation

Angle modulation is a class of carrier modulation that is used in telecommunications transmission systems.

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Aurora

An aurora (plural: auroras or aurorae), sometimes referred to as polar lights, northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in the Earth's sky, predominantly seen in the high-latitude regions (around the Arctic and Antarctic).

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Automatic link establishment

Automatic Link Establishment, commonly known as ALE, is the worldwide de facto standard for digitally initiating and sustaining HF radio communications.

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Coherence bandwidth

Coherence bandwidth is a statistical measurement of the range of frequencies over which the channel can be considered "flat", or in other words the approximate maximum bandwidth or frequency interval over which two frequencies of a signal are likely to experience comparable or correlated amplitude fading.

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Coherence time

For an electromagnetic wave, the coherence time is the time over which a propagating wave (especially a laser or maser beam) may be considered coherent.

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Comb filter

In signal processing, a comb filter is a filter implemented by adding a delayed version of a signal to itself, causing constructive and destructive interference.

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Constant envelope

Constant envelope is achieved when a sinusoidal waveform reaches equilibrium in a specific system.

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Decibel

The decibel (symbol: dB) is a unit of measurement used to express the ratio of one value of a physical property to another on a logarithmic scale.

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Delay spread

In telecommunications, the delay spread is a measure of the multipath richness of a communications channel.

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Diplomatic Wireless Service

The Diplomatic Wireless Service (DWS) was the name of the communications system set up for the British Foreign Office by Brigadier Richard Gambier-Parry, the first Foreign Office Director of Communications, in the latter part of 1945.

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Dual-tone multi-frequency signaling

Dual-tone multi-frequency signaling (DTMF) is an in-band telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers.

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Earth–Moon–Earth communication

Earth–Moon–Earth communication (EME), also known as moon bounce, is a radio communications technique that relies on the propagation of radio waves from an Earth-based transmitter directed via reflection from the surface of the Moon back to an Earth-based receiver.

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Eb/N0

Eb/N0 (the energy per bit to noise power spectral density ratio) is an important parameter in digital communication or data transmission.

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Fading

In wireless communications, fading is variation or the attenuation of a signal with various variables.

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Forward error correction

In telecommunication, information theory, and coding theory, forward error correction (FEC) or channel coding is a technique used for controlling errors in data transmission over unreliable or noisy communication channels.

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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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Frequency-hopping spread spectrum

Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver.

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Frequency-shift keying

Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier signal.

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High frequency

High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz).

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In-band signaling

In telecommunications, in-band signaling is the sending of control information within the same band or channel used for voice or video.

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Institution of Electrical Engineers

The Institution of Electrical Engineers (IEE, pronounced I-E-E) was a British professional organisation of electronics, electrical, manufacturing, and Information Technology professionals, especially electrical engineers.

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Intermodulation

Intermodulation (IM) or intermodulation distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies, caused by nonlinearities in a system.

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Intersymbol interference

In telecommunication, intersymbol interference (ISI) is a form of distortion of a signal in which one symbol interferes with subsequent symbols.

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Joseph Hooton Taylor Jr.

Joseph Hooton Taylor Jr. (born March 29, 1941) is an American astrophysicist and Nobel Prize in Physics laureate for his discovery with Russell Alan Hulse of a "new type of pulsar, a discovery that has opened up new possibilities for the study of gravitation.".

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Letter beacon

Letter beacons are radio transmissions of uncertain origin and unknown purpose, consisting of only a single repeating Morse code letter.

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M-ary transmission

An M-ary transmission is a type of digital modulation where instead of transmitting one bit at a time, two or more bits are transmitted simultaneously.

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Multi-frequency signaling

In telephony, multi-frequency signaling (MF) is a signaling system that was introduced by the Bell System after World War II.

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Multipath propagation

In wireless telecommunications, multipath is the propagation phenomenon that results in radio signals reaching the receiving antenna by two or more paths.

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Near vertical incidence skywave

Near vertical incidence skywave, or NVIS, is a skywave radio-wave propagation path that provides usable signals in the range between groundwave and conventional skywave distances—usually 30–400 miles (50–650 km).

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Noisy-channel coding theorem

In information theory, the noisy-channel coding theorem (sometimes Shannon's theorem or Shannon's limit), establishes that for any given degree of noise contamination of a communication channel, it is possible to communicate discrete data (digital information) nearly error-free up to a computable maximum rate through the channel.

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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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OZ7IGY

OZ7IGY is a Danish amateur radio beacon, and the world's oldest VHF and UHF amateur radio beacon and active since the International Geophysical Year in 1957.

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Phreaking

Phreaking is a slang term coined to describe the activity of a culture of people who study, experiment with, or explore telecommunication systems, such as equipment and systems connected to public telephone networks.

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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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Radio Society of Great Britain

The Radio Society of Great Britain (RSGB), first founded in 1913 as the London Wireless Club, is the United Kingdom's recognised national society for amateur radio operators.

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Radioteletype

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.

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Signal-to-noise ratio

Signal-to-noise ratio (abbreviated SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise.

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Signaling (telecommunications)

In telecommunication, signaling has the following meanings.

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Skywave

In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere.

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Ultra high frequency

Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one decimeter.

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Very high frequency

Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten to one meter.

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WSJT (amateur radio software)

WSJT is a computer program used for weak-signal radio communication between amateur radio operators.

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Redirects here:

MFSK, MFSK16, MFSK8, Mfsk16, Mfsk32, Mfsk4, Mfsk64, Multi-frequency shift keying.

References

[1] https://en.wikipedia.org/wiki/Multiple_frequency-shift_keying

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