How Do You Identify Radio Frequency Bands?
For an electromagnetic wave to carry information, its properties such as frequency, amplitude and phase, need to be systematically modulated. To communicate information, the modulated wave will then have to be transmitted, detected and finally transformed into other signals such as sound. This whole process is generally called radio communication. The frequencies used for radio are just a small portion of the whole electromagnetic spectrum. 1. Understand how radio frequencies are used. The whole spectrum of radio frequencies ranges from 3 Hz to 300 GHz. However, not all of this is used for regular or commercial communication. Those that range from 3 to 30 Hz are called extremely low frequencies (ELF) and are used by submarines. On the other end are the extremely high frequencies (EHF) ranging from 30 to 300 GHz. EHF is used more for microwave communication and astronomy. The frequencies we’re more familiar with are those in the middle. AM radio broadcasting is at the low frequency (LF)
