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.
The Sarnoff team's innovative approach restricts the watermark pattern to very low frequencies in both space and time.

Full browser ?