OTHR

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Over-The-Horizon Radar is a military radar system deployed by the United States in various places outside the continental USA. In recent years, interference assumed to be from these systems has been widely noted in the shortwave pirate and amateur radio bands, primarily around the area of 7 MHz. The sound of these systems on typical shortwave receivers sounds like a loud, wideband chirping, and older listeners liken the sound to the Russian Woodpecker, a similar HF radar system of Soviet design.

Official WRC OTHR over the horizon radar bands:

WRC OTH Radar sub-band 4438 kHz to 4488 kHz

  • 4.438 - 4.488 MHz
  • 5.250 - 5.275 MHz
  • 9.305 - 9.355 MHz (not usable in North, Central or South America)
  • 13.450 - 13.550 MHz (this band is actually for a secondary allocation)
  • 16.100 - 16.200 MHz
  • 24.450 - 24.650 MHz
  • 26.200 - 26.420 MHz 26200 kHz to 26420 kHz
  • 41.015 - 41.665 MHz
  • 43.350 - 44.000 MHz

See also



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