The 20-meter or 14-MHz amateur radio band is a portion of the shortwave radio spectrum, comprising frequencies stretching from 14.000 MHz to 14.350 MHz. The 20-meter band is widely considered among the best for long-distance communication (DXing), and is one of the most popular—and crowded—during contests. Several factors contribute to this, including the band's large size, the relatively small size of antennas tuned to it (especially as compared to antennas for the 40-meter band or the 80-meter band) and its good potential for daytime DX operation even in unfavorable propagation conditions.
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The 20-meter band was first made available to amateurs in the United States by the Third National Radio Conference on October 10, 1924. The band was allocated on a worldwide basis by the International Radiotelegraph Conference in Washington, D.C., on October 4, 1927. Its frequency allocation was then 14–14.4 MHz. The allocation was reduced to 14–14.35 MHz by the International Radio Conference of Atlantic City, New Jersey 1947.
IARU Region 1
Europe, Africa, Middle East and Northern Asia
|IARU Region 1|
IARU Region 2
|IARU Region 2|
IARU Region 3
|IARU Region 3|
Effective 12:01 a.m. EST, February 23, 2007
Canada is part of region 2 and as such is subject to the IARU band plan. Radio Amateurs of Canada offers the bandplan below as a recommendation for use by radio amateurs in that country but it does not have the force of law and should only be considered a suggestion or guideline.
|= CW only|
|= CW, narrow band digital ( <= 500 Hz )|
|= CW, narrow band digital ( <= 500 Hz ), wide band digital|
|= CW, RTTY and data (US: < 1 kHz Bandwidth)|
|= CW, phone|
|= CW, narrow band digital ( <= 500 Hz ), phone|
|= CW, phone and image|
- "Frequency Allocations". Arrl.org. 5 March 2012. Archived from the original on 14 March 2010. Retrieved 29 October 2012.
- Ford, Steve (ed.). "Picking a band". The ARRL Operating Manual (8th ed.). Newington, CT: American Radio Relay League. p. 1-15.
- "Propagation of RF Signals". The ARRL Handbook For Radio Communications (82nd ed.). Newington, CT: American Radio Relay League. 2005. p. 20.4. ISBN 0-87259-928-0.
- "Frequency or wave band allocations". Recommendations for Regulation of Radio Adopted by the Third National Radio Conference. October 6–10, 1924. p. 15.
- "Archived copy" (PDF). Archived from the original (PDF) on 8 March 2014. Retrieved 6 July 2014.CS1 maint: archived copy as title (link)
- "Archived copy" (PDF). Archived from the original (PDF) on 15 July 2014. Retrieved 6 July 2014.CS1 maint: archived copy as title (link)
- "IARU Regions". www.iaru.org. International Amateur Radio Union (IARU). Archived from the original on 30 December 2013. Retrieved 6 January 2014.
- "Archived copy" (PDF). Archived from the original (PDF) on 27 November 2010. Retrieved 8 July 2008.CS1 maint: archived copy as title (link)
|Range||Band||ITU Region 1||ITU Region 2||ITU Region 3|
|LF||2200 m||135.7–137.8 kHz|
|MF||630 m||472–479 kHz|
|160 m||1.810–1.850 MHz||1.800–2.000 MHz|
|HF||80 / 75 m||3.500–3.800 MHz||3.500–4.000 MHz||3.500–3.900 MHz|
|60 m||5.3515–5.3665 MHz|
Broken into channels and sub-bands, which vary by country.
|40 m||7.000–7.200 MHz||7.000–7.300 MHz||7.000–7.200 MHz|
|30 m[w]||10.100–10.150 MHz|
|20 m||14.000–14.350 MHz|
|17 m[w]||18.068–18.168 MHz|
|15 m||21.000–21.450 MHz|
|12 m[w]||24.890–24.990 MHz|
|10 m||28.000–29.700 MHz|
|VHF||6 m||50.000–52.000 MHz
|4 m[x]||70.000–70.500 MHz||N/A|
|2 m||144.000–146.000 MHz||144.000–148.000 MHz|
|1.25 m||N/A||220.000–225.000 MHz||N/A|
|UHF||70 cm||430.000–440.000 MHz||430.000–440.000 MHz|
|33 cm||N/A||902.000–928.000 MHz||N/A|
|23 cm||1.240–1.300 GHz|
|13 cm||2.300–2.450 GHz|
|SHF||9 cm||3.400–3.475 GHz[y]||3.300–3.500 GHz|
|5 cm||5.650–5.850 GHz||5.650–5.925 GHz||5.650–5.850 GHz|
|3 cm||10.000–10.500 GHz|
|1.2 cm||24.000–24.250 GHz|
|EHF||6 mm||47.000–47.200 GHz|
|4 mm[y]||75.500 GHz[x] – 81.500 GHz||76.000–81.500 GHz|
|2.5 mm||122.250–123.000 GHz|
|2 mm||134.000–141.000 GHz|
|1 mm||241.000–250.000 GHz|
|THF||Sub-mm||Some administrations have authorized spectrum for amateur use in this region;|
others have declined to regulate frequencies above 300 GHz, leaving them available by default.
[w] HF allocation created at the 1979 World Administrative Radio Conference. These are commonly called the "WARC bands".
|See also: Radio spectrum, Electromagnetic spectrum|