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The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress.The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243.0 MHz—the second harmonic of VHF guard—for military ...
Pan-pan calls may be made on the aircraft emergency frequency, but they are more often made on the frequency already in use, or another appropriate frequency. ICAO Annex 10, Volume V, § 4.1.3.1.1 states "the emergency channel (121.5 MHz) shall be used only for genuine emergency purposes". However, ICAO member states can deviate from this rule.
Multi-frequency signaling (MF) is a group of signaling methods that use a mixture of two pure tone (pure sine wave) sounds. Various MF signaling protocols were devised by the Bell System and CCITT .
An alphabet is a standard set of letters written to represent particular sounds in a spoken language. Specifically, letters largely correspond to phonemes as the smallest sound segments that can distinguish one word from another in a given language. [1]
Madonna's first greatest-hits compilation album, The Immaculate Collection (1990), was released in November including two new songs, "Justify My Love" and "Rescue Me". [117] The album was certified diamond by RIAA and sold over 30 million copies worldwide, becoming the best-selling compilation album by a solo artist in history.
The Guardian is a British daily newspaper.It was founded in Manchester in 1821 as The Manchester Guardian and changed its name in 1959, [5] followed by a move to London. Along with its sister papers, The Observer and The Guardian Weekly, The Guardian is part of the Guardian Media Group, owned by the Scott Trust Limited. [6]
A round, which is a song such as "Row, Row, Row Your Boat", which different groups of singers all start to sing at a different time, is an example of polyphony. homophony: a clear melody supported by chordal accompaniment. Most Western popular music songs from the 19th century onward are written in this texture.
The Sardinian language, although practiced in a state of diglossia, continued to be spoken by all social classes, its linguistic alterity and independence being universally perceived; [212] Spanish, on the other hand, was the prestige code known and used by the Sardinian social strata with at least some education, in so pervasive a manner that ...