Why do FM stations drop out at shorter distances from their source than AM?

Because the waves are reflected, they can reach radio receivers that are very far away from the radio tower. However, the relatively short wavelengths of FM waves means that they don’t reflect off the ionosphere as AM waves do. Instead, FM waves pass through the ionosphere and out into space.

Which one is used for long distance communication?

Telephone, telegraph, phototelegraph, and television signals are transmitted simultaneously over long distances over air, cable, and radio communications lines in which hundreds or thousands of independent communications channels are formed by multiplexing communications lines.

Why can radio travel further?

Without interference, radio waves travel in a straight line from the broadcast source, ultimately hitting the ionosphere. For AM waves, given the right conditions, they will essentially bounce back and forth between the ground and the ionosphere, propagating the signal farther and farther.

Why do I need a shortwave radio?

Over the years, people have relied on shortwave radio for broadcasting voice and news to listeners over massive areas – even spanning continents. Other uses include over-the-horizon radar, two-way international communication, and diplomatic communication.

Is shortwave radio still used?

Shortwave is used not just by international radio stations or radio amateurs but is also essential for aviation, marine, diplomatic and emergency purposes. But the BBC kept shortwave for its large audiences in Africa and part of Asia.

What is the advantage of FM over AM radio?

The main advantage of frequency modulation (FM) in radio transmission is that it has a large signal-to-noise ratio (ratio of signal power to the noise power) and therefore rejects radio frequency interference better than the amplitude modulation (AM). Hence, most music is broadcast over FM radio.

What is meant by FM modulation?

Frequency Modulation, often referred to as FM, is another, relatively newer method of modulation where the carrier wave is modified proportionally according to the input signal. In FM, the instantaneous frequency of the carrier wave is altered according to the amplitude of the input signal. In FM, the frequency…

What happens if I use FM instead of AM for transmission?

If you had a transmitter at 1 MHz and decided to use FM instead of AM, it would still be heard at long distances under the same conditions that AM is heard.

What is the advantage of frequency modulation in radio transmission?

The main advantage of frequency modulation (FM) in radio transmission is that it has a large signal-to-noise ratio (ratio of signal power to the noise power) and therefore rejects radio frequency interference better than the amplitude modulation (AM).