A radio beachcomber is an electromagnetic beachcomber broadcast by an antenna. Radio after-effects accept altered frequencies, and by affability a radio receiver to a specific abundance you can aces up a specific signal.In the United States, the FCC (Federal Communications Commission) decides who is able to use which frequencies for which purposes, and it issues licenses to stations for specific frequencies. See How Radio Works for added capacity on radio waves.
When you accept to a radio base and the anchorperson says, "You are alert to 91.5 FM WRKX The Rock!," what the anchorperson agency is that you are alert to a radio base broadcasting an FM radio arresting at a abundance of 91.5 megahertz, with FCC-assigned alarm belletrist of WRKX. Megahertz agency "millions of cycles per second," so "91.5 megahertz" agency that the transmitter at the radio base is aquiver at a abundance of 91,500,000 cycles per second. Your FM (frequency modulated) radio can tune in to that specific abundance and accord you bright accession of that station. All FM radio stations address in a bandage of frequencies amid 88 megahertz and 108 megahertz. This bandage of the radio spectrum is acclimated for no added purpose but FM radio broadcasts.
In the aforementioned way, AM radio is bedfast to a bandage from 535 kilohertz to 1,700 kilohertz (kilo acceptation "thousands," so 535,000 to 1,700,000 cycles per second). So an AM (amplitude modulated) radio base that says, "This is AM 680 WPTF" agency that the radio base is broadcasting an AM radio arresting at 680 kilohertz and its FCC-assigned alarm belletrist are WPTF.