What Are The Advantages And Disadvantages Of AM And FM?

Why is AM radio bad?

AM transmissions are much more susceptible than FM or digital signals are to interference, and often have lower audio fidelity.

Thus, AM broadcasters tend to specialise in spoken-word formats, such as talk radio, all news and sports, leaving the broadcasting of music mainly to FM and digital stations..

Why is FM immune to noise?

Due to this noise signal there is some change in the amplitude of the fm wave signal. But the fm wave does not contain signal in the amplitude variation all the information is stored in the frequency vairation. so it is more immune to noise .

Why is AM radio bad at night?

The short answer to the question is: AM signals travel farther at night, so the FCC requires most AM radio stations to reduce power at night in order to avoid interference. … At night, as solar radiation decreases, the D layer dissipates, allowing AM signals to reflect back to the earth.

What are the advantages and disadvantages of FM over AM?

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.

What is the main advantage of FM over AM?

The main advantages of FM over AM are: Improved signal to noise ratio (about 25dB) w.r.t. to man made interference. Smaller geographical interference between neighboring stations. Less radiated power.

Which of the following is the disadvantage of FM or AM?

FM systems have a much wider bandwidth than AM systems and therefore more prone to selective fading. Frequency modulation requires much wider channel (7 to 15 times) as compared to AM . Hence , correct option is A .

What is difference between 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.

What is the major disadvantage of AM?

The major disadvantage of AM is that the signal is affected by electrical storms and other radio frequency interference. Also, although the radio transmitters can transmit sound waves of frequency up to 15 kHz, most receivers are able to reproduce frequencies only up to 5kHz or less.

Why am is used for long distance communication?

The AM signals have longer wave lengths and hence have a tendency to bend over the surface thereby covering larger distances.

What are the drawbacks or limitations of amplitude modulation?

Disadvantages: It requires more than twice the amplitude frequency to modulate the signal with a carrier. As a result, the efficiency of such a system is very low as it consumes a lot of power for modulations and this causes a considerable operational cost.

What are the applications of AM?

Amplitude modulation applicationsBroadcast transmissions: AM is still widely used for broadcasting on the long, medium and short wave bands. … Air band radio: VHF transmissions for many airborne applications still use AM. .More items…

What are the limitations of AM?

Disadvantages of Amplitude Modulation:An amplitude modulation signal is not efficient in terms of its power usage. … It is not efficient in terms of its use of bandwidth. … AM detectors are sensitive to noise hence an amplitude modulation signal is prone to high levels of noise.Reproduction is not high fidelity.