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If we pretend we are sending one letter per electromagnetic wave, this means we can transfer 60 letters per second. Each wave that is sent contains a small package of information. That's how wireless communication works (a very simplified description of frequency modulation or FM). They have to wait for the next hour or the next day in order to send the next letter. During the light part of the day, they can send messages only with dozen letters. This is the letter "C," being the third letter in the alphabet. For example, from 1 pm until 2 pm, one of them sends three smoke signals. The number of smoke signals determines a letter of the alphabet. They have agreed to send a number of smoke signals during each hour of the day. Let's forget about electronics for a while and pretend we have two people on two mountain peaks that send smoke signals to each other. Why Is the Frequency of Wireless Devices So High?Ĭan't we use the 60 Hz power cables to transmit data? Why do we use devices of such a high frequency as the 2.4 GHz router? The answer is: yes, we can use 60 Hz for data transfer, but it will be very slow.
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If you do a manual switch, the frequency will be one or two switches per second or 1-2 Hz. The power cables in your home are running alternating current that is 60 Hz, which means there is a device (generator) that generates current of different polarity 60 times per second. The number of polarity switches per second determines the frequency of the waves in units called Hertz (Hz). The more frequent the changes are, the more waves are generated. On each polarity change, a electromagnetic wave is created just like when you make a wave in a pool of water. That's basically how alternating current works: it switches positive and negative current.
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Connecting each to one of the battery terminals creates a current in one direction and when you switch the plus and minus terminals you reverse the current flow.
Imagine you have a battery and two wires. The antenna is two pieces of wire with running alternating current. When electric current travels through wires, it generates a magnetic field around them. In this article, I will call it EMF radiation, which stands for electromagnetic field radiation. Taken out of context, radiation doesn't mean anything negative unless you know what is emitted. The term "radiation" has gained quite a lot of negative fame because of nuclear power plants. Is Electromagnetic Radiation the Same as Nuclear Radiation?
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In this text, you will learn about the amount of radiation emitted from devices such as wireless routers, smartphones, dumb phones, Bluetooth keyboards and mice, laptops, radio triggers for strobes, tablets, and other equipment. No, this is not an article for the fifth generation mobile communication standard.
As someone who uses them professionally, I decided to measure their electromagnetic radiation to see if they are a threat to my health. Wireless devices have become a part of our daily life and work.
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