The frequency band between 3 and 30 kHz. abbreviation: VLF Fr: très basse fréquence

Frequencies from 3 kHz to 30 kHz.

It is a radio frequency band from 3 kHz to 30 kHz.

The band of frequencies from 3 kilohertz to 30 kilohertz.

Electromagnetic energy in the approximate frequency range of 3,000 hertz (3 kHz) to 30,000 hertz (30 kHz).

(Abbreviated VLF.) See radio frequency band.

(VLF) Frequency band from 3 kHz to 30 kHz.

Very low frequency or VLF refers to radio frequencies (RF) in the range of 3 to 30 k Hz. Since there is not much bandwidth in this band of the radio spectrum, only the very simplest signals are used, such as for radionavigation.