What is the difference in am and fm?

The difference is in how the carrier wave is modulated, or altered. With AM radio, the amplitude, or overall strength, of the signal is varied to incorporate the sound information. With FM, the frequency (the number of times each second that the current changes direction) of the carrier signal is varied.

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Each FM station is allocated 150 kHz of bandwidth, which is 15 times that of an AM station. This means that an FM station can transmit 15 times as much information as an AM station and explains why Music sounds so much better on FM.

AM and FM Modulated signals for radio. AM (amplitude modulation) and FM (frequency modulation) are types of modulation (coding). The sound of the program material, usually coming from a radio studio, is used to modulate (vary) a carrier wave of a specific frequency, then broadcast.

Reliable and comforting. There are over 6,000 AM stations in the U.S. today. And they still have a huge audience of listeners, typically locals who seek out the latest weather, traffic, and news information. Most still listen in their cars or trucks.

AM stands for Amplitude Modulation And has poorer sound quality compared with FM, but it is cheaper to transmit and can be sent over long distances — especially at night. The lower frequencies of the band we use for AM signals creates a wavelength that is extremely large.

All the transmitted power in FM is useful, while in AM most of the transmitted power is in carrier which contains no information. The amplitude of FM is constant which makes it independent of the modulation deption, while in AM modulation depth directs the transmitted power.

With FM, the frequency (the number of times each second that the current changes direction) of the carrier signal is varied. FM signals have a great advantage over AM signals. Both signals are susceptible to slight changes in amplitude. With an AM broadcast, these changes result in static.

Following are the disadvantages of AM: ➨The most natural as well as man made radio noise are of AM type. The AM receivers do not have any means to reject this kind of noise. ➨Weak AM signals have low magnitude compare to strong signals.

Certain radio stations, however, especially the short-wave and AM bands, can travel much farther. Short-wave can circle the globe, and AM stations transmit hundreds of miles at night. This extended transmission is possible is because of the ionosphere — one of the layers of the atmosphere.

The decline in AM audio was Due more to regulation than to method of modulation. One aspect of radio not understood by most listeners is the concept of occupied bandwidth, or the amount of spectrum that a station uses to transmit its signal.

FM transmission has broadcast waves ( 88-108 MHZ) that are shorter than AM broadcast waves (540 – 1600 kHz) and do not go as far.

Speech occupies 4KHz, high quality music specifies 15KHz, AM radio limits baseband bandwidth to about 5KHz and FM radio limits baseband bandwidth to 15KHz. There are two main components in a radio system. Radio system i.e. radio receiver should be able to receive any type of audio source simultaneously.