What is the VLF frequency range?

The VLF (Very Low Frequency) frequency range is accurately defined as 3 to 30 kHz. This range is typically utilized for various types of communication and navigation systems, including submarine communications and maritime radio systems. VLF radio waves can penetrate deep into the ocean, making them useful for communicating with submarines at significant depths, where higher frequency signals would not be effective due to overwhelming absorption by water.

In this frequency range, the wavelengths are quite long, which means the signals can follow the curvature of the Earth, allowing for long-distance transmission even with low power. Understanding the characteristics of VLF is essential for applications in radio frequency engineering and communications technology.