Most commonly, it refers to radio wavelengths longer than 1000 metres; including the International Telecommunications Union's (ITU's) low frequency (LF) (30–300 k Hz) and very low frequency (VLF) (3–30 k Hz) bands.Sometimes, part of the medium frequency (MF) band (300–3000 k Hz) is included.refers to parts of the radio spectrum with relatively long wavelengths.The term is an historic one, dating from the early 20th century, when the radio spectrum was considered to consist of long (LW), medium (MW), and short (SW) radio bands.
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In Europe, Africa and large parts of Asia (International Telecommunication Union Region 1), where a range of frequencies between 148.5 and 283.5 k Hz is used for AM broadcasting (in addition to the medium wave band), the term longwave usually refers specifically to this broadcasting band.
The International Telecommunication Union Region 1 longwave broadcast band falls wholly within the low frequency band of the radio spectrum (30–300 k Hz).