Radio waves are specially designed to transmit music, conversation, pictures and data, through thin air. This happens in thousands of different ways that are not censored to humans. There are many technologies use radio waves to communicate. Wi-Fi in PC’s, laptop and net book also uses radio waves to transmit network or Internet, therefore it’s convenient and cable free in the future. Radio technology is simple by using electrical component that cost a few dollars, which is incredibly easy. Radio waves are transmitted by static.

Modern radio uses continuous sine waves to transmit audio, data and video. It is because there are many different people at a same time tune into different radio or TV stations. Also you can see there are factually thousands of different radio waves at a same time around you like TV broadcast, AM and FM radio broadcast, police/fire/ambulance broadcast, satellite TV transmission, cell/mobile conversation, GPS signals and many more. A different radio signals uses different sine wave frequency and they are split into to two parts. The transmitter that produces radio waves and the receiver receives the radio waves that were produced.

The real life examples of radio technology is a baby monitor, it is a simple way that it works. The transmitter sits near the baby and the parents listens to the receiver in the other room. If the baby makes uncertain noises then the parents checks the baby, that’s why it’s a baby monitor. The characteristics of the baby monitor are:

• Amplitude modulation (AM)
• The frequency range is 49MHz
• Numbers of frequencies are 1 or 2 and the
• Transmitter power usage is less than 1 watt.

Another example of a radio wave technology is mobile phones; mobile phones are more sophisticated devices. A cell phone has transmitter and a receiver together that can be used at the same time; also it can detect hundreds of different. The good thing about cell phones it that they switch between frequencies during a conversation. The characteristics of a cell phone are:

• Frequency Modulation (FM)
• Frequency Range is 800MHz
• Numbers of frequencies is 1,664 (832 per provider, 2 providers per area)
• Transmitter power usage is 3 Watts

When transmitting information from a transmitter, you need to modulate the wave in order to encode the information. There are 3 main ways to modulate the waves;

Pulse Modulation: This pulse modulation is a way of sending a Morse code.

Amplitude Modulation: AM radio station use the modulation to encode the information, the sine waves changes.

Frequency Modulation: FM radio station and a lot of other wireless technology, which is largely to immune static and the waves changes slightly.

When you modulate the sine wave, you can transmit the information. The characteristic of a sine wave is the frequency; it is number of times it oscillates up and down per second.

Radio sends signals by transmission by modulation of electromagnetic waves combining with frequencies. Electromagnetic energy travels by oscillating electromagnetic fields by going through vacuum of space and air. The information is passed by modulating, amplitude, frequency or phrase. The radio wave goes through the electrical conductor. An example of it is when tuning into radio.