Radio Waves

• Radio Frequencies Signals: are used to transmit all types of information. Are made by magnetic and electric waves. 

• Electric waves are oriented vertically and Magnetic waves horizontally.

• The electromagnetic radiation is not that harmful as the nuclear radiation, and also is not radioactive. 

• Radio waves travel at speed of light that is: 299792458 meters per second. 

• Lower frequencies=Longer wavelength and vice versa.

• Speed of light/Frequency=Wavelength

• AM: KHz-lees capacity to store information.

• FM: MHz-more capacity to store information.

• Omni Antenna: it spreads its signal evenly in every direction. It´s non directional.

•  Directional Antenna: Radio waves are concentrated in one direction. 

• A non directional antenna puts the RF where the viewers are. 

• A single AM tower acts as an Omni Antenna.

• Three or more AM tower make a Directional Antenna.

• Radio waves pass through and the vacuum space. Plus, they do not travel well through dense materials as water, metal and concrete.

• AM broadcasting uses ground waves.

• The curve of the earth reduces the distance at which RF can be received. The hills do not allow the RF to pass.

• Trees Absorbs RF, buildings reflects and refract RF causing it to bounce off in many directions.

• Lower frequencies travel further than Higher frequencies.

• When both power levels are equal is called Circular Polarity