very low frequencies

very low frequencies (VLF)

The range of radio frequencies between 3 and 30 kHz. These are invariably ground waves, and with high-power and large, efficient antennae they can provide worldwide coverage. VLF is used by Omega.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
It may be suggested that for very low frequencies, there is no need to limit harmonic content.
Very low frequencies could cause internal bleeding while the highest would destroy human flesh.

Full browser ?