What is the difference between the FM and AM stations?
At the most basic level, the radio broadcasts we hear take place in four stages. First, a microphone converts sound waves into electrical signals. Second, the electrical signal from the microphone changes, or modulates, a radio wave called a carrier radio wave, so that it will contain the sound information. This carrier wave is emitted by the broadcast tower. Third, a receiving antenna on a radio tuned to the proper frequency picks up the carrier wave, which then travels to the receiver or radio. Finally, the receiver detects the modulation in the carrier wave and converts it back into electrical signals. The electrical signals are sent to a loudspeaker, which changes them once again into sound waves. Sound information — including pitch and loudness — is carried by radio waves in one of two ways. Depending on the type of radio station — AM or FM — the carrier wave is modified differently. Amplitude modulation, or AM, stations code information in the carrier wave by changing, or mod
