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AM and FM are methods of delivering signals embedded in a carrier frequency. There are many applications for them but they are best known for radio applications
AM means amplitude modulation. In this technique, the amplitude or height of the carrier signal increases and decreases as the base signal changes. AM radio signals will travel great distances so a single transmitter can cover large areas.
FM means Frequency Modulation where the frequency of the carrier signal increases and decreases to represent the change in voltage of the base signal. FM signals tend to offer better signal quality than AM but the range is far less, demanding multiple transmitters to cover the same area as one AM transmitter.
Wiki User
∙ 13y ago
Wiki User
∙ 15y agoBecause AM radio stations are tightly packed on the dial - only 9 KHz apart. This means that transmitted audio can only go up to about 4 KHz. FM stations are normally spaced 200 KHz apart, and transmitted audio can go beyond our ability to hear it. Also, all AM transmissions are susceptible to "impulse noise" interference, chiefly from car ignition systems. Since FM systems operate at constant amplitude, it is easy for them to discriminate against pulse interference.
Wiki User
∙ 12y agoAM radio signals travel at the same speed of FM radio signals. The difference is how far one can reach without going out. AM travels farther because it bounces off the atmosphere. FM does not travel as far but is more clear. That is because it cant travel as far so it has less electrical interference to go through then an AM radio signal will.
Wiki User
∙ 12y agoThat would depend mainly on the frequency/wavelength, NOT on the modulation. However, commercial FM uses frequencies around 100 MHz, that doesn't travel that far (at least, under Earth conditions) as commercial AM.
Wiki User
∙ 12y agoAM signals can bounce off the ionosphere. FM is pretty much line-of-sight. Your signal will stop at the horizon as seen by the transmitting and receiving antennas.
Wiki User
∙ 11y agoFM required more power for transmittion b/c of high frequency transmittion
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What wave has a shorter wavelength AM or FM?
Generally, the wavelength of an FM signal is shorter than an AM signal. A typical FM broadcast band is 88-108 MHz, while a typical AM broadcast band is 540-1660 KHz, making the FM signal wavelength 100 times shorter.
Why the range of AM is more than that of FM?
A.M. tends to hug the earth some and can bounce off the ionosphere. F.M. tends to go straight off into space thus it is hard to pickup at a distance.
AM radio waves are able to traves farther than FM radio waves because?
AM waves are reflected by earth's ionosphere
What is a relationship between frequency and wavelength?
The issue is not frequency and wavelength, a relationship is the problem AM Wave length is longer, than FM Wave length. Shorter wave lengths have a tendency to be shorter in the pm. AM Wave lengths were used before FM wave lengths.
What are FM waves?
FM radio uses frequency modulation to broadcast sound over radio. FM radio waves are usually transmitted between 87.5 to 108.0 megahertz.
Why FM is more clearer than am?
The abbreviations FM and AM stands for amplitude modulation and frequency modulation. The reason why FM is more clearer than AM is because FM has a better signal-to-noise ratio than AM does.
Why FM is good than am in communication?
The FM signal is more amune to static in the atmosphere than AM signals.
Why amplitude modulation used for long distances?
AM travels well over longer distances than FM is capable of, but has a lower fidelity and is more susceptible to metal, which is why it is not used as often in cities.
An fm radio station signal travels in a 40 mile radius an am radio station signal travels in a 4 mile radius how much more area does the fm station cover than the am station?
You're talking about circular areas.-- The area of a circle is (pi) x (radius)2 .-- The area of the 4-mile radius is (pi) x (4)2 = 16 pi square miles-- The area of a circle is proportional to the square of its radius.So the area of the 40-mile radius is (10)2 = 100 times the area ofthe 4-mile radius = 1,600 pi square miles.The larger circle has (99 times the area of the 4-mile radius) more areathan the smaller circle has.(99) x (16 pi) = 1,584 pi = 4,976.3 square miles more than the smaller circle.
Why is the area of coverage for AM radio greater than FM radio?
The basic reason is that AM radio is broadcast on a lower frequency, while FM is broadcast on a higher frequency. And the lower frequency signals will curve around the earth a bit more than the higher frequency FM signals. FM is considered more "line of sight" than AM, which has that "fat" ground wave that hugs the earth a bit more.
When was More FM created?
More FM was created in 1991.
Why are FM tones used in ASSR?
boz there is lesas interferance to the signal as a signal travels...............
How many radio stations are there in Cambodia?
More than 100 for FM and Few for AM.
How far is the range on an FM tranmitter for a car radio?
The range on an FM transmitter for a car radio is roughly designed to transmit a radio signal to more than 500 meters away in the FM broadcasting band.
How much money was bill gardner making on kool FM?
More than KOOL was willing to spend.
Why noice level less in FM than am?
Frequency modulation differs from amplitude modulation. FM coverage distance is less with more clarity due to non interference with carrier waves.
Why FM radio is better than am radio?
Actually, AM is better than FM. AM can cover the world, and is the best form of communication. FM is completely worthless except for the fact that it's better sounding.
