20-meter band

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.^[1] 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.^[2] 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.^[3]

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History

The Third National Radio Conference was responsible for opening up the 20-meter band to amateur radio operators in the US^[4] on October 10, 1924. The band was allocated on a worldwide basis by the International Radiotelegraph Conference^[5] 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.^[6]

Band plans

IARU Region 1

Europe, Africa, Middle East and Northern Asia^[7]

20 meters	14000–14070	14070–14099	14099–14101	14101–14350
IARU Region 1

IARU Region 2

The Americas^[7]

20 meters	14000–14070	14070–14099	14099–14101	14101–14350
IARU Region 2

IARU Region 3

Asia-Pacific^[7]

20 meters	14000–14070	14070–14099	14099–14101	14101–14112	14112–14350
IARU Region 3

United States

Effective 12:01 a.m. EST, February 23, 2007

20 meters	14000–14350
United States	14000–14025	14025–14150	14150–14175	14175–14225	14225–14350
General
Advanced
Extra

Canada

Canada^[8] 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.

License class	14.000–14.070	14.070–14.095	14.095–14.0995	14.0995–14.1005	14.1005–14.112	14.112–14.350
Basic(+), Advanced

Japan

Changed on September 25, 2023.

License class	14000–14070	14070–14100	14100–14350
1st and 2nd			narrow-band All modes

Key

	= 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)
	= Beacons
	= CW, phone
	= CW, narrow band digital ( <= 500 Hz ), phone
	= CW, phone and image

References

^ "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. Govt. Print. Off. October 6–10, 1924. p. 15.
^ "INTERNATIONAL RADIOTELEGRAPH CONVENTION AND GENERAL AND SUPPLEMENTARY REGULATIONS" (PDF). INTERNATIONAL RADIOTELEGRAPH CONVENTION OF WASHINGTON, 1927. 25 November 1927. Archived from the original (PDF) on 8 March 2014. Retrieved 6 July 2014.
^ "RADIO REGULATIONS ANNEXED TO THE INTERNATIONAL TELECOMMUNICATION CONVENTION (ATLANTIC CITY, 1947)" (PDF). Archived from the original (PDF) on 15 July 2014. Retrieved 6 July 2014.
^ ^a ^b ^c "IARU Regions". www.iaru.org. International Amateur Radio Union (IARU). Archived from the original on 30 December 2013. Retrieved 6 January 2014.
^ "RAC MF/HF Band Plan" (PDF). rac.ca. Archived from the original (PDF) on 27 November 2010. Retrieved 8 July 2008.

International amateur radio frequency allocations^[v]

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
MF	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
	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 (50.000–54.000 MHz)^[y]	50.000–54.000 MHz
	4 m^[x]	70.000–70.500 MHz	—
	2 m	144.000–146.000 MHz	144.000–148.000 MHz
	1.25 m	—	220.000–225.000 MHz	—
UHF	70 cm	430.000–440.000 MHz	430.000–440.000 MHz (420.000–450.000 MHz)^[y]
	33 cm	—	902.000–928.000 MHz	—
	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.
[v] All allocations are subject to variation by country. For simplicity, only common allocations found internationally are listed. See a band's article for specifics. [w] HF allocation created at the 1979 World Administrative Radio Conference. These are commonly called the "WARC bands". [x] This is not mentioned in the ITU's Table of Frequency Allocations, but many individual administrations have commonly adopted this allocation under "Article 4.4". [y] This includes a currently active footnote allocation mentioned in the ITU's Table of Frequency Allocations. These allocations may only apply to a group of countries.
See also: Radio spectrum, Electromagnetic spectrum

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This page was last edited on 29 September 2023, at 04:39

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