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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. 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.〔Picking a band. ''The ARRL Operating Manual'', 8th Edition (Steve Ford, Ed.):1-15.〕 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.
==History==
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〔http://www.itu.int/dms_pub/itu-s/oth/02/01/S02010000144002PDFE.pdf〕 in
Washington, D.C., on October 4, 1927. Its frequency allocation was then 14000–14400 kHz. The allocation was reduced to 14000–14350 kHz. by the International Radio Conference of Atlantic City, New Jersey 1947.〔http://www.itu.int/dms_pub/itu-s/oth/02/01/S020100002B4002PDFE.pdf〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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