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.
AM radio waves have longer wavelengths compared to FM radio waves. This means that AM waves are better able to diffract around obstacles and travel farther distances. FM radio waves, with their shorter wavelengths, are less prone to diffraction and tend to travel in straight lines, making them more susceptible to obstacles blocking their path.
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.
The range of AM radio is greater than that of FM radio because AM signals can travel long distances by bouncing off the Earth's upper atmosphere, a phenomenon known as ionospheric reflection. FM signals, on the other hand, travel in a straight line and are more susceptible to obstacles like buildings and hills, limiting their range.
The determination of the medium wave frequency range is between AM and FM radio frequencies. Medium waves have lower frequencies than FM but higher frequencies than long waves. They are commonly used for AM radio broadcasting.
AM radio waves have longer wavelengths compared to FM radio waves, allowing them to diffract or bend around obstacles such as buildings and hills. This enables AM radio waves to travel greater distances and provide better coverage in areas with obstructions. FM radio waves, on the other hand, travel in straight lines and are more affected by obstacles.
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.
The FM signal is more amune to static in the atmosphere than AM signals.
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.
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.
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.
More FM was created in 1991.
More than 100 for FM and Few for AM.
boz there is lesas interferance to the signal as a signal travels...............
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.
More than KOOL was willing to spend.
Frequency modulation differs from amplitude modulation. FM coverage distance is less with more clarity due to non interference with carrier waves.
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.