So, for each level of amplitude, a different sound is heard by the listener. The radio takes the amplitude or height of the signal and transforms it into a single sound. The way this is accomplished is called amplitude modulation. The electricity has to be changed into a format that can be understood. A quiet mouth tells us nothing, but once it starts to talk, it creates a change that is understandable to the listener. The best way to think of it is simply a way of communicating. In order to hear music or voices through the radio, the waves must be changed from their random patterns. So, what is modulation? Think of it simply as a change. For it to be transmitted as a coherent message, it has to undergo вЂњmodulation.вЂќ This is where the AM and FM get their names. It is often explained as electricity in the air.ДЄs this electricity is given off, it makes unorganized sound. These are considered low-frequency, but still emit a small amount of electromagnetic radiation through the wires into the air. This basically translates to the current being able to change direction in the wire roughly 60 times per second. In the United States, the AC works with 120 volts at 60 hertz. It works at different levels in each country, which is why you may need to travel with a special connector for outlets to use American electronics overseas. This current is used to make all our electronics function. They are close to light waves, but our eyes just canвЂ™t see them.ДЄlternating Current (AC) generates electromagnetic waves. Radio waves can reflect, polarize, diffract and refract. Each electromagnetic wave has attributed characteristics that are different from each other. Radio waves are a specified length or frequency of electromagnetic waves that are all around us. However, before we look at the reasons to have one, letвЂ™s talk about how they work.ДЄM or Amplitude Modulation is a type of radio that utilizes radio waves that are transmitted through the air. Perhaps one of the best reasons to keep an AM radio in the house is for live alerts of current happenings. They have had a long life and continue to serve a purpose for many people. When the radio was invented, they were a popular luxury to have in your house. Although they are often though of as a thing of the past, AM radios are still a valuable asset to have around the house.

Portable radios with best reception