15-meter band

Amateur radio frequency band the amateur radio band the international shortwave radio band shortwave bands thumb|Right a HB9XBG vertical antenna for the 15-meter band. (Left a HB9XBG antenna for the 20 m band) article USA the United States December 2010 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.March 2009 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. History The 15-meter band was designated by the 1947 International Radio Conference of Atlantic City in part to compensate for the loss of the 160-meter band to amateurs by the introduction of LORAN during World War II.http://www.itu.int/dms_pub/itu-s/oth/02/01/S020100002B4506PDFE.pdf Radio Regulations Annexed To The International Telecommunication Convention (Atlantic City, 1947) www.itu.int 13 January 2022 https://web.archive.org/web/20120710090845/http://www.itu.int/dms_pub/itu-s/oth/02/01/S020100002B4506PDFE.pdf 10 July 2012 dead The 15-meter band opened to amateurs for CW operation only in the United States on May 1, 1952, and telephony operations were authorized above 21.25 MHz and Novice CW operations between 21.100 and 21.250 MHz on March 28, 1953."We Get 21 Mc." QST, June 1952, p. 29. Frequency allocation United States Megahertz 21.000–21.025 21.025–21.200 21.200–21.225 21.225–21.275 21.275–21.450 Novice / Technician General Advanced Extra Key = CW, RTTY and data (US: < 1 kHz bandwidth) = CW, phone and image = CW only (US Novice/Technician: 200 W PEP maximum TPO) Canada 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.Canadian 0-30 MHz Band Plan https://wp.rac.ca/wp-content/uploads/files/pdf/RAC%20Bandplan%20December%201%202015.pdf accessed 1 December 2015 License class 21.000-21.070 21.070-21.080 21.080-21.083 21.083-21.090 21.090-21.125 21.125-21.150 21.150-21.340 21.340-21.343 21.343-21.450 Basic(+), Advanced Japan Changed on September 25, 2023. License class 21.000–21.070 21.070–21.150 21.150–21.450 All Classnarrow-band All modes Key = CW only = CW, narrow band digital ( <= 500 Hz ) = CW, narrow band digital ( <= 500 Hz ), wide band digital = Beacons = CW, phone = CW, phone, image ( <= 2700 Hz ) = Digital only = Phone only = TV only See also Shortwave bands References ARRLWeb: US Amateur Bands http://www.arrl.org/FandES/field/regulations/bands.html August 3, 2005 https://web.archive.org/web/20050907063135/http://www.arrl.org/FandES/field/regulations/bands.html 7 September 2005 ARRLWeb: ARRL Band Plans http://www.arrl.org/FandES/field/regulations/bandplan.html August 3, 2005 https://web.archive.org/web/20050803074913/http://www.arrl.org/FandES/field/regulations/bandplan.html 3 August 2005 UK Amateur Radio Bandplans Band Plans http://www.rsgb.org/spectrumforum/bandplans/RSGB%20Band%20Plan%20master.htm August 3, 2005 Click the 15 Meter button at the bottom of the page Ham Radio QRP http://www.ac6v.com/qrp.htm#CALL August 3, 2005 https://web.archive.org/web/20050924141611/http://ac6v.com/qrp.htm#CALL September 24, 2005 dead IARU Region 1 Bandplan https://www.iaru-r2.org/wp-content/uploads/region-1-hf-bandplan-2006.pdf January 1, 2006 IARU Region 2 Bandplan https://www.iaru-r2.org/wp-content/uploads/region-2-mf-hf-bandplan-e.pdf January 1, 2008 IARU Region 3 Bandplan http://www.jarl.or.jp/iaru-r3/r3bandplan.doc August 3, 2005 https://web.archive.org/web/20050513073139/http://www.jarl.or.jp/iaru-r3/r3bandplan.doc 2005-05-13 dead Category:Amateur radio bands