In modern society, radio is the most widely used medium of broadcasting and electronic communication. Radio can be broadcasted with both microwaves and longer radio waves. These are transmitted in two ways: amplitude modulation (AM) and frequency modulation (FM). Amplitude radio is created by combining a sound wave from a microphone, tape, record, or CD with a "carrier" radio wave. This results in a wave that transmits voice or programming as its amplitude (intensity) increases and decreases. Frequency modulation conveys information, voice, and music on a radio wave is to slightly change, or modulate, the frequency. One big advantage of frequency modulation is that it is static free.
AM radio works by changing the amplitude of the carrier wave and FM radio works by changing the frequency of the carrier wave.
In amplitude modulation the amplitude of a carrier wave on one specific frequency is modified. The antenna sends out two kinds of Am waves: ground waves and sky waves. From the antenna ground waves spread out horizontally and they travel through the air along the earth's surface. On the other hand sky waves spread up into the sky. When these waves reach the ionosphere, they may be reflected back to earth. This reflection enables AM radio waves to be received at great distances from the antenna.
From this picture it is evident that ground waves don't go very far. This means numerous stations can be put on the same frequency without interfering with each other — assuming they are far enough apart. Problems found are that sky waves can end up in other states, provinces, or even in other countries.
FM Radio waves also go horizontally along the ground and skyward. However, due to the higher frequency of the carrier w...
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Hetrodyning is a method of transferring a broadcast signal from a carrier to a fixed frequency in a reciever so most of the reciever does not have to be returned when you change the channel/station on the radio. A superhetrodyne reciever is fitted to most modern radios in order to use the method of hetrodyning. Hetrodyning is used with AM and FM radio to ensure a more convenient and efficient experience.
There are many differences between AM and FM radio such as AM has the capability to have a larger number of channels but has not got the best quality. FM does not have the same capability of the number of channels but the space between the channels is much wider which makes the quality much better. Although FM radio is limited to 100 radio channels this is made up for in the quality of the radio broadcasted and is therefore the better option.
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