What is "longwave"

a. 1 (context of radio waves English) Having a wavelength of greater than 1000 meters. 2 (context of radio equipment English) capable of transmitting or receiving signals at such a wavelength.

In radio, longwave, also written as long wave (in British and American parlance) or long-wave, and commonly abbreviated LW, refers to parts of the radio spectrum with relatively long wavelengths. The term is a 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 wavelengths. Most modern radio systems and devices use wavelengths which would then have been considered 'ultra-short'.

In contemporary usage, the term longwave is not defined precisely, and its meaning varies across the world. Most commonly, it refers to radio wavelengths longer than 1000 metres; frequencies less than 300 kilohertz (kHz), including the International Telecommunications Union's (ITU's) low frequency (LF) (30–300 kHz) and very low frequency (VLF) (3–30 kHz) bands. Sometimes, part of the medium frequency (MF) band (300–3000 kHz) is included.

In Europe, Africa and large parts of Asia ( International Telecommunication Union Region 1), where a range of frequencies between 148.5 and 283.5 kHz 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 kHz). Broader definitions of longwave may extend below and/or above it. In the US, the Longwave Club of America is interested in "frequencies below the AM broadcast band",i.e., all frequencies below 535 kHz. (Lower frequencies correspond to longer wavelengths.)

Longwave is an American indie rock band. The band was formed in 1999 by guitarist, songwriter and vocalist Steve Schiltz; guitarist Shannon Ferguson; bassist David Marchese; and drummer Jeremy Greene. Their sound has been compared to Radiohead, the Strokes and 1970s post-punk rockers Television, as well as elements of shoegaze.

Longwave or Long Wave may refer to:

• Longwave, parts of the radio spectrum with relatively long wavelengths
• Outgoing longwave radiation
• Longwave (band), a rock band
• Long Wave, a Jeff Lynne album
• Kondratiev wave, an economics concept
• Long wave macrotexture, a road characteristic
• Longwave (film), a 2013 French-language Swiss-French-Portuguese film, original title Les Grandes Ondes (à l'ouest)

Longwave is a 2013 Swiss-French-Portuguese comedy-drama film directed by Lionel Baier. The movie is set in 1974, based on a true story about a Swiss production team working for Radio Suisse Romande, who are assigned to produce a puff piece in Portugal but instead witness the Carnation Revolution. The film's principal cast are Valérie Donzelli, Michel Vuillermoz, Patrick Lapp, and Francisco Belard.