WordNet
n. 3 to 30 kilohertz [syn: VLF]
Wikipedia
Very low frequency or VLF is the ITU designation for radio frequencies (RF) in the range of 3 kHz to 30 kHz and wavelengths from 10 to 100 kilometres. Due to its limited bandwidth, audio (voice) transmission is highly impractical, and therefore, only low data rate coded signals are used. The VLF band is used for a few radio navigation services, government time radio stations (broadcasting time signals to set radio clocks) and for secure military communication. Since VLF waves penetrate about 40 meters into saltwater, they are used for military communication with submarines. The band is also known as the myriametre band or myriametre wave as the wavelengths range from one to ten myriametres (an obsolete metric unit equal to 10 kilometres).
Usage examples of "very low frequency".
For communications, they were equipped with the SSIXS (Submarine Satellite Information Exchange System) UHF SATCOM communication systems, as well as the ability to receive VLF (Very Low Frequency) and ELF (Extremely Low Frequency) messages.
It's coming from the Kazon ship, but the message is being piggybacked on a very low frequency subspace carrier wave.
Among the Big Sniffer's package of advanced tools was a Very Low Frequency receiver sensitive to the 15.