Explain the radio frequency spectrum used in communication system


In the radio communication system, the frequencies ranging from a few kilohertz to many gigahertz all are being used for various purposes.

Let us discuss the applications of various frequency bands.

The frequencies most commonly used in early days were from about 300 kHz to 3 MHz and were called as medium frequencies(MF).

The frequencies in the range 30 kHz to 300 kHz are known as the low frequencies (LF).

The frequencies in the range 3 kHz to 30 kHz are called as very low frequencies (VLF).

On the higher frequency side, high frequencies (HF) will cover the frequency range from 3 MHz to 30 MHz.

Then very high frequency (VHF) from 30 MHz TO 300 MHz and so on .

Table.1 presents the details of entire usable frequency spectrum and its applications.

Table.1 : The radio frequency (RF) spectrum