The problem is that this electric current is far too weak to be transmitted through the air–the entire point of radio waves. In order to change this low-power electronic signal into a powerful radio signal that can sent to a transmitter and broadcast through an antennae, an RF amplifier is used to give the signal a needed boost. To solve this problem, amplifiers spend most of their energy ensuring that every part of the signal is replicated faithfully as it is enhancing and transferred to a much higher-power system. Of course, this is a very basic description of the process: modern RF amplifiers employ entire circuit boards to make sure the signal is given maximum strength with as little signal distortion as possible. Today, these amplifiers are used no only in radio towers, walkie-talkies, and specialized communication devices, but also in every cell phone and cell phone tower. Writer Bio
