- 15-meter band
In
telecommunications , 15 meters is ashortwave radio band used byamateur radio operator s. The band is located at 21MHz , and almost all countries permitamateur radio activity on the entire band. The 15 meter band was opened to amateurs in the United States on May 1, 1952.ummary
The 15 meter or 21 MHz band is a core
amateur radio frequency band, which spans 21 to 21.45 MHz and is allocated toradio amateurs as primary users worldwide. 15 meters is considered a DX band, most useful for inter-continental communication during daylight hours, especially in years close to thesolar maximum , since the 15 meter wavelength propagates primarily via reflection by the F-2 layer.Because the frequency is the third
harmonic of the 40 meter amateur band, it is possible to obtain a close impedance match using an antenna cut for 40 meters on 15 meters, as well. Usually, though, users of the 15 meter band employ rotatable, multi-elementdirectional antenna s such as aYagi antenna orQuad antenna to improve their communications with the particular area of the world they wish to reach.Frequency allocation
United States
Key
ee also
Shortwave bands References
*cite web | title = ARRLWeb: US Amateur Bands | work = | url = http://www.arrl.org/FandES/field/regulations/bands.html | accessdate = August 03 | accessyear = 2005
*cite web | title = ARRLWeb: ARRL Band Plans | work = | url = http://www.arrl.org/FandES/field/regulations/bandplan.html | accessdate = August 03 | accessyear = 2005
*cite web | title = RAC Web: Canada HF Band Plan | work = | url = http://www.rac.ca/service/RAC_Draft_HF_Band_PlanR1.pdf | accessmonthday = June 27 | accessyear = 2007
*cite web | title = UK Amateur Radio Bandplans Band Plans | work = | url = http://www.rsgb.org/spectrumforum/bandplans/RSGB%20Band%20Plan%20master.htm | accessdate = August 03 | accessyear = 2005 Click the 15 Meter button at the bottom of the page
*cite web | title = Ham Radio QRP | work = | url = http://www.ac6v.com/qrp.htm#CALL | accessdate = August 03 | accessyear = 2005
*cite web | title = IARU Region 1 Bandplan | work = | url = http://www.iaru-r2.org/wp-content/uploads/region-1-hf-bandplan-2006.pdf | accessdate = January 01 | accessyear = 2006
*cite web | title = IARU Region 2 Bandplan | work = | url = http://www.iaru-r2.org/wp-content/uploads/region-2-mf-hf-bandplan-e.pdf | accessdate = January 01 | accessyear = 2008
*cite web | title = IARU Region 3 Bandplan | work = | url = http://www.jarl.or.jp/iaru-r3/r3bandplan.doc | accessdate = August 03 | accessyear = 2005
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