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15-meter band — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/15-meter_band
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-08T01:16:10.497Z
SHA-256 of the archived text: bae653011504ea302eb4d7641747ac297d7e1f8115485c427bac07152bdcdb22
Stable URL of this page: https://metraipolis.com/documento/dc_9dbf2b59effa

How to cite

15-meter band — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/15-meter_band (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_9dbf2b59effa (Metraipolis archive dc_9dbf2b59effa, sha256 bae653011504ea302eb4d7641747ac297d7e1f8115485c427bac07152bdcdb22)

BibTeX

@misc{dc9dbf2b59effa,
  title = {15-meter band — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/15-meter_band},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_9dbf2b59effa; sha256 bae653011504ea302eb4d7641747ac297d7e1f8115485c427bac07152bdcdb22},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/15-meter_band. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The 15-meter band (also called the 21-MHz band or 15 meters) is an amateur radio frequency band spanning the shortwave spectrum from 21 to 21.45 MHz. The band is suitable for amateur long-distance communications, and such use is permitted in nearly all countries. Because 15-meter waves propagate primarily via reflection off of the F-2 layer of the ionosphere, the band is most useful for intercontinental communication during daylight hours, especially in years close to solar maxima, but the band permits long-distance without high-power station equipment outside such ideal windows. The 15-meter wavelength is harmonically related to that of the 40-meter band, so it is often possible to use an antenna designed for 40 meters.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «15-meter band» — https://en.wikipedia.org/wiki/15-meter_band
Wikidata Q191017 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q191017
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/15-meter_band?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1371067100, consultata il 2026-10-08T00:53:19.667Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 9079fb76d08864aad1c8896cf38e5d71fc809e8f12886c4ae387d7b41034d6c3