Broadcasting – Transmission of Electromagnetic Radio Waves

It is by no doubt that you have already watched your favorite TV stations or tuned-in into your radio to listen into the sound of music. 

Okay, maybe not if you are still living under the cave for years staying on some remote places where technology couldn’t reach.

Technologies like your Radio, TV, Mobile Phones and other devices that transmit information through space can be termed as “Broadcasting”. 

To provide you more of it’s general meaning, it is the process of sending out information in all directions.

How it works:

Let’s take your TV as an example, all TV stations does have their powerful transmitter which radiates electromagnetic radio waves in all directions. 

If your location has been covered by the transmitted electromagnetic waves then your TV can receive the signal through its receiver antenna.

To tell you a brief history about the improvement of radio waves signal, it all began from the invention of Dr. Lee De Forest who discovered the vacuum tube. 

This device can actually amplify the short electrical signal converting it into its original form. 

However, it has been replaced by Transistors in 1948 by Bell Telephone Laboratories because it offers more advantages than the tube. 

You can read more information at this post entitled “Development of Wireless Communication”.

Carrier Modulation Technique:

Signal

Carrier

Output

The carrier itself is the electromagnetic wave that holds the information. It is then to be processed through modulation technique to output the desired and understandable information for use to interpret. 

There are several Modulation Techniques but the most common among them are the Amplitude Modulation (AM) and Frequency Modulation (FM).