Telecommunication and Networking: Telecommunication and Networking lesson 6

Hi everyone :) this week our topis is ;

Unbounded media or wireless technology

Unbounded media transports the electromagnetic waves without using a physical conductors. They use signals thought air or water to transmit signals. therefore signals available to anyone who has a device capable of receiving them.

Radio frequency (RF)

Radio communication is devided into eight ranges called bands. I found same information about RF it is clear and easy to understand about it.

A sound wave is produced with a frequency of 5 Hz - 20 kHz.
The sound wave is equivalent to a pressure wave traveling through the air.
A microphone converts the sound wave into an electrical signal.
The electrical wave traveling through the microphone wire is analogous to the original sound wave.
The electrical wave is used to encode or modulate a high-frequency "carrier" radio wave. The carrier wave itself does not include any of the sound information until it has been modulated.
The carrier wave can either be amplitude modulated (AM, top) by the electrical signal, or frequency modulated (FM, bottom).
The signal is transmitted by a radio broadcast tower.
Your radio contains an antenna to detect the transmitted signal, atuner to pick out the desired frequency, a demodulator to extract the original sound wave from the transmitted signal, and an amplifier which sends the signal to the speakers. The speakers convert the electrical signal into physical vibrations (sound).