AM vs FM

AM

• Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave.
• AM works by varying the amplitude of the signal while frequency remains constant.

FM

• Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave.
• FM technology encodes the information (sound) by varying the frequency of the wave and amplitude is kept constant.

Comparison of AM and FM

AM	FM
It receivers are not immune to noise.	It receivers are immune to noise.
It has poorer sound quality.	It has better sound quality.
It ranges from 535 to 1705 KHz.	It ranges in higher spectrum from 88 to 108 MHz.
It can be used for transmission overlong distances.	It can be used for transmission over short distances.
It has lower bandwidth enabling more stations available in any range.	It has higher bandwidth and hence more stations is not possible.
It operates up to 1200 bits per second.	It operates 1200 to 2400 bits per second.
It is used for speech broadcasting and news channels.	It is used to mainly for music channels.