Radio Definitions and Explanations

Radio waves I the place on the spectrum of energy that allows RFID and NFC to be possible. It is this energy that is sent by a source and received by (you guessed it) a receiver. This same energy is used by the military, truckers, other workers, children and many others alike for communication purposes as well as people all over the world for listening to music and up until recently watching TV. As of last year Television can no longer be received using an antenna and radio waves.

A radio is defined as:

“ a combining form with the meanings “dealing with radiant energy” ( radiometer ), “employing or dealing with radio waves” ( radioacoustics; radiolocation; radiotelephone ), “emitting rays as a result of the breakup of atomic nuclei” ( radioactive; radiocarbon ), “characterized by, employing or dealing with such rays” ( radiography; radiopaque; radiotherapy ).” Taken from: Dictionary.com

As well as:

Radio is the transmission of signals through free space by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information is carried by systematically changing (modulating) some property of the radiated waves, such as amplitude, frequency, phase, or pulse width. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.” Which is taken from: Wikipedia.com

As for “How Radio Spectrum Works”:

There is AM radio and FM radio which you probably use on a daily basis but these aren't the only types of radio there are. When television was receivable by antenna it was sent by UHF waves. Each of these are different types of energy on the electromagnetic spectrum. A great explanation of this is:

“When you listen to a radio station and the announcer says, "You are listening to 91.5 FM WRKX The Rock!," what the announcer means is that you are listening to a radio station broadcasting an FM radio signal at a frequency of 91.5 megahertz, with FCC-assigned call letters of WRKX. Megahertz means "millions of cycles per second," so "91.5 megahertz" means that the transmitter at the radio station is oscillating at a frequency of 91,500,000 cycles per second. Your FM (frequency modulated) radio can tune in to that specific frequency and give you clear reception of that station. All FM radio stations transmit in a band of frequencies between 88 megahertz and 108 megahertz. This band of the radio spectrum is used for no other purpose but FM radio broadcasts.” Which is taken from: How Stuff Works