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.
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.

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