What is a very low frequency?

A very low frequency (VLF) is a term used to describe a number of sounds that are transmitted across a particular radio band. Specifically, the very low frequency refers to any radio waves that have frequencies between 3 kilohertz (KHz) and 30 kHz. These are called very low, because frequencies that are used to communicate range from 3 Hertz (Hz) to 300 Gigahertz (GHz). VLF is not the lowest of the frequency belts. There are three frequency strips that are even lower than this designation, which are ultra -low frequencies (ULF), super low frequency (SLF) and extremely low frequency (ELF). These three frequency strips cover the spectrum from 3 Hz at the bottom of usable radio frequencies up to 3 kHz, the lowest frequency included in the very low -frequency band.Engths. Within the VLF, the wavelengths may differ from about 62 miles (100 km) for 3 kHz sounds to about 6.2 miles (10 km) for 30 kHz sounds. Different frequency bands for radio waves are used in different ways of government, military and public use.

frequencies that are transmitted to a very low frequency range are rarely picked up by antennas that are used for most communication. This is because most radio roads, including broadcasting radio stations and telephone communication, are at much higher frequency ranges. The antennas used for higher frequencies are improved to better pick up and make the sounds more pleasant.

There are antennas and VLF stations around the world, and these types of signals can be transmitted worldwide. Very low -frequency messages are used in a number of different applications for behavioral waves found in this radio frequency band. The fact that sound waves found in VLF emissions have long wavelengths means that sounds can be heard deep in the water and also far below the ground.

Although very low -frequency signals are used from many different DThe reasons, probably the most common is to provide communication with submarines that are underwater. The amount of salt found in seawater affects how deep the sounds of VLF can travel when they are sent from the surface. The depth in the water that VLF can penetrate ranges from 30 to 130 feet (10 to 40 meters). In addition to providing the communication method, the VLF can also be used to help navigate submarines when they are immersed in the ocean.