Radio waves

3Hz to 1Hz

Frequency of radio waves

Low to medium frequency, shortwave frequency, high frequency, highest frequency, extremely high frequency

Types of radio waves

Low to medium frequency radio waves

This type have the highest wavelength, used in submarines and mine caves

Lighting

Natural source of low to medium frequency radio waves

30KHz to 3MHz

Range of low to medium frequency radio waves

Shortwave frequency radio waves

Used for broadcasting information, can be broadcasted over long distances

1.7 to 30MHz

Range of shortwave frequency radio waves

High frequency radio waves

Used in amplitude modulation systems. Long range waves and reflected by the ionosphere. Used in communication by AM systems but face interference inside buildings

Radio wave propagation

The behavior of radio waves as they travel, different frequencies of waves have different behaviors

Ground wave

A radio wave propagation that travels following the contour of the Earth

Skywave

A radio wave propagation that is reflected by the charged particles in the ionosphere

Troposcatter

A radio wave propagation scattered by the turbulence in the troposphere

Line-of-sight

A radio wave propagation that travels directly in s practically straight line

Transmitter, antenna, and receiver

3 types of radio wave communication system

Transmitter

Generates the radio waves and transmits them to the receiver

Antenna

Radiates the radio waves from the transmitter into the air

Receiver

Receives the radio waves from the transmitter and decodes the information contained within them

Hertzian wave

Former name for radio waves which was changed in 1900s