high frequency

the range of frequencies in the radio spectrum between 3 and 30 megahertz.


high-frequency, adjective
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World English Dictionary
high frequency
HF a radio-frequency band or radio frequency lying between 3 and 30 megahertz

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The device picks up the high frequency echolocation calls of nearby bats and
  runs them through a buffer to make them audible.
To produce a high frequency sound, it opens its mouth wide and pulls its head
The argument of the book does not depend on a high frequency of transformation.
And cellphone towers are in the high frequency range, but well below microwaves.
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