15 Meters (21 Mhz through 21.45 Mhz)
The 15 meter or 21 MHz band is a core amateur radio frequency band, which spans 21 to 21.45 MHz and is allocated to radio 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 the solar 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-element directional antennas such as a Yagi antenna or Quad antenna to improve their communications with the particular area of the world they wish to reach.
Band Charts are for general information, please check your local band plan for operating privlages. For example; ARRL Band Plan or RSGB Band Plan.
© 2008 (KG6YPI, Brandon Hansen)