By: Jack Wylde
Submitted: 2010-02-24 23:53:49 | Word Count: 510
In this article we will discuss How Do Auto Radio Antennas Work. We will also discuss its importance and its working. We shall understand more about radio waves and its properties and how transmission happens through it.
In this paragraph we will understand what is an antenna.Human ear cannot perceive radio waves directly. This is because they fall in the electromagnetic range which cannot be picked up by a normal human ear. Then we may have a doubt how the information gets transmitted especially through radio and television. We may also have doubts regarding wireless communications like cell phone and transmission of data through Internet. But it is possible to catch these waves by a device. It is this device we name as an antenna.
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Radio antennas receive electromagnetic waves. These look like tubes made of stainless steel because they conduct well. They also have the property of expansion and contraction at a desired height.
There is a major classification in this. Amplitude modulation and frequency modulation. The broadcast of AM signals happen at shorter frequencies and broadcast of FM signals happen at a higher frequency range. Only antennas that are long can pick up lower frequency signal and only antennas that are short are capable of broadcast of FM signals that happen at a higher frequency.We all happily enjoy music in radio. We have never thought how such a broadcast happens. Nowadays many stations have come up. As we keep tuning we will observe clearly how these antennas picks up radio waves of a particular station. Each station works at a particular assigned frequency. A license has to obtained from FCC which regulates the communication of radio stations. Only waves that are strong can be caught by the antenna of the radio.
There are lot of differences between an ordinary radio antenna and radio antenna of car because the car is not stationary. A heavy wire should be connected that runs through the body of the car that remains shielded. We may have doubt why shielding should be done. This is done to prevent interference of external waves. These external wave can be anything right from cell phone or even various power lines in the road. Only when this interference is stopped there can be smooth flow of radio waves to tuner from the antenna of the radio in the car.
Nowadays technology has become so advanced technology like presence of gears in the tubes of the antenna. These tubes are operated by means of a motor. This is to receive the signal by the antennas when the radio is being switched on. There are other differences also between stationary radio antenna and that of a radio antenna of a car that is moving because the steel used in construction of antenna in car is more stronger and rigid. Some vehicles are also trying to use the same technology used in mobile phone for transmission of radio wave signals. However this is still in experimentation stage only.
Thus we have learnt How Do Auto Radio Antennas Work
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